Mestrado em Geotecnia, Estruturas e Construção Civil (EECA)
URI Permanente para esta coleção
Navegar
Navegando Mestrado em Geotecnia, Estruturas e Construção Civil (EECA) por Título
Agora exibindo 1 - 20 de 149
Resultados por página
Opções de Ordenação
Item Acoplamento e interação modal em painéis cilíndricos imperfeitos e simplesmente apoiados(Universidade Federal de Goiás, 2019-08-30) Silva, Wanclaine Almeida Vaz da; Silva, Frederico Martins Alves da; http://lattes.cnpq.br/9929132527197884; Silva, Frederíco Martins Alves da; Nuñez del Prado, Zenón José Guzmán; Orlando, DiegoInternal resonance is one of the main areas of research in the field of nonlinear dynamics. This phenomenon occurs when the proportion of the natural frequencies of distinct vibration modes is an integer, and the internal resonance allows the exchange of energy between the vibration modes involved, influencing the stability of the dynamic responses. In this work deals the analyses of linear and nonlinear free and forced vibrations of a simply supported cylindrical panel, subjected to a time dependent transverse loading, considering the modal coupling and modal interaction phenomena in the proposed modal solution for the transversal displacement field. The transversal equations of motion are obtained through an energetic approach using the deformation field and mean surface curvature changes given by Donnell's nonlinear theory for shallow shells. The system of nonlinear partial differential equations is determined by minimizing the Lagrangian energy of structural system. From classical vibration modes, an analysis of free vibrations is performed to determine the geometries that generate modal interaction between two or three distinct vibration modes, it is noteworthy that the geometries found in this dissertation have internal resonances of the type: 1: 1, 1: 2, 1: 3, 1: 1: 2 and 1: 2: 4. The proposed modal solution for the transversal displacement field is achieved by employing the perturbation method, considering in the initial modal solution the existing modal interaction between the two or three distinct vibration modes. From the Galerkin method, nonlinear partial differential equations are discretized giving rise to a system of nonlinear ordinary differential equations. The results of nonlinear free vibrations of a perfect cylindrical panel, or with a geometric imperfection in the form of one of the modes of vibration present in the modal solution for transverse displacements, are expressed as a function of the number of degrees of freedom considered in the modal solution the transverse displacement field. It is also made an analyse of the forced vibrations, determining the resonance curves, the basin of attraction, phase planes and mapping the Poincaré section of the perfect and imperfect cylindrical panel. Thus, it can be observed that the shape and magnitude of the initial geometric imperfections have a great influence on the nonlinear responses of both free and forced vibrations.Item Análise da deformabilidade do fosfogesso(Universidade Federal de Goiás, 2014-07-02) Chagas, Juliana Verônica Ribeiro das; Mascarenha, Márcia Maria dos Anjos; Rezende, Lilian Ribeiro de; http://lattes.cnpq.br/9258692609398794; Rezende, Lilian Ribeiro de; Sales, Maurício Martins; Boscov, Maria Eugênia GimenezThe phosphogypsum, a by-product from the production of phosphoric acid, requires the availability of large areas for its storage, representing a problem for the industries of fertilizers, both economically and environmentally. Therefore, there is a need to search for alternative applications of phosphogypsum in order to minimize the impacts of its deposition. Several studies were performed to verify the possibility of using phosphogypsum in geotechnical works, which showed promising results. However, the deformability of this material can be a limiting factor for their use. Thus, one of the main objectives of this study was to analyse the evolution of deformation over time of the phosphogypsum, soil and a mixture containing 10% of phosphogypsum and 90% of soil (mixture A). Furthermore, this study also analysed the deformability of these materials when they are not saturated, which is the natural condition in which they are used. The phosphogypsum was collected in a phosphate fertilizers industry, called Anglo American, in the city of Catalão, Goiás, and the soil was collected in Aparecida de Goiânia, Goiás. For the analysis of deformation over time, consolidation tests were performed with different loading times (48 hours, 7 days and 15 days) on samples in saturated condition. After the consolidation tests, others tests were conducted in order to give a better understanding of the results, such as: X-Ray diffraction, permeability, scanning electron microscopy (SEM) and tests to obtain the water retention curve using the equipment WP4C (Dewpoint PotentiaMeter). For the analysis of the deformation in unsaturated condition, consolidation tests in unsaturated conditions and tests of water content control were performed in the soil, phosphogypsum and mixture A (10% phosphogypsum + 90% soil). The results show no stabilizing of the deformation over time of the mixture A and the phosphogypsum. Furthermore, the increase of the deformation due only to the secondary compression expected for a period of five years is approximately 0.5% for the soil, 1.4% for the mixture A and 15.5% for the phosphogypsum. It has been found by granulometry tests that the deformations occur due to the breakage of the grains of phosphogypsum. It is noteworthy that no mineralogical change occurs, as observed by X-ray diffraction. Furthermore, it was verified with the unsaturated consolidation tests that a slight variation of suction occurs during the test, but this variation influenced more the deformability of the phosphogypsum than of the soil and mixture A. Thus, it was concluded that the deformation limits the use of phosphogypsum or mixtures of phosphogypsum and soil in geotechnical works.Item Análise da estrutura porosa de materiais cimentícios por meio da interação e associação de técnicas avançadas de caracterização(Universidade Federal de Goiás, 2019-12-20) Hilário, Hanaelly Garcia do Carmo; Carasek, Helena; http://lattes.cnpq.br/3023241186996790; Cascudo, Oswaldo; http://lattes.cnpq.br/3336749062812376; Cascudo, Oswaldo; http://lattes.cnpq.br/3336749062812376; Oliveira, Andrielli Morais de; Vieira, Janine DomingosCementitious materials such as concretes, mortars and pastes are naturally porous and they have a complex internal pore structure. This porosity has determining effects on the mechanical properties and durability of structures. Therefore it’s required a better understanding of the porous structure. This understanding is based on the use of techniques for measuring the porosity of cementitious materials, further analysis and interpretation of results and techniques. Thus, the objective of the present work was to analyze whether there is correlation, parallelism and complementation between the following advanced characterization techniques: Mercury Intrusion Porosimetry (MIP), Nitrogen Adsorption (BET), Nuclear Magnetic Resonance (NMR) and X-ray Computed Microtomography (μCT) when used for porosity measurement in cementitious matrices. As well as assess the responsiveness and sensitivity of these techniques through their results and output variables in relation to the various situations proposed in the dosage. The methodological steps taken to reach the objective include: the complete characterization of the materials used, the dosage of five different concretes (REF 0.40, REF 0.55, 0.55/10MK, 0.55/9SA1NS and REF 0.70 ), tests with concretes, such as: slump test, incorporated air content, compressive strength and modulus of elasticity, tests on pastes, such as: DRX; and tests on mortars: MIP, BET, NMR and μCT, for porosity studies. The results show that, depending on the range and structure of the pores, the results of BET, MIP, NMR and μCT may be more or less representative. The NMR tests captured a higher total porosity for the studied mortars. The NMR results also have good correlations with all other techniques studied, either with the whole sample scope or considering only the reference mortars. The same statement can be made for the BET technique. NMR and μCT techniques together occupy the largest pore diameter range and they have a number of similarities, in this way it is concluded that the combination of the two is the most viable.Item Análise da interação solo-estrutura em edifícios sobre estacas(Universidade Federal de Goiás, 2009-10-29) ARAÚJO, Adrianne Carvalho de; SALES, Maurício Martines; http://lattes.cnpq.br/2033708685029423; PRADO, Ademir Aparecido do; http://lattes.cnpq.br/4118518363912053The joined structure-foundation analysis of buildings is one of the studied themes of Soil- Structure Interaction (SSI). In this research, a numerical tool was developed using the Matlab program to evaluate the soil-structure interaction in buildings, where the problem has been studied in the last years, but has not became a current practice in civil engineering. The developed program, here named as AIEFE, predict the settlement using the Aoki and Lopes (1975) method, using as input data the reaction loads of building columns, calculated in any subroutine of spatial-portico analysis. The commercial program TQS was chosen as this subroutine in the present research. The found foundation settlements were converted in stiffness values and, then, inputted again in the structural analysis, predicting new settlements, but no more considering the foundations as fixed points . The method is iterative, aiming to reach the settlement (or load) convergence. Two examples of buildings supported by piled foundations were analyzed. The first one presented an almost square plant and the other one was typically rectangular. The SSI effects were analyzed in terms of column loads and also stiffness and foundations settlements during the constructive process of the 15-levels studied cases. During the construction of the first building levels, it was observed a greater load and settlement redistribution, due the lower structural stiffness. Using the foundation stiffness instead of settlement values was considered as an efficient process of convergence. It was also observed that the non-linear foundation behavior had a great influence in the structure load redistribution, even on advanced construction stages when the structure stiffness has a great value.Item Análise das causas e do impacto financeiro de contratações adicionais em obras públicas(Universidade Federal de Goiás, 2015-07-28) Ribeiro, Hélen Regina de Oliveira e; Brandstetter, Maria Carolina Gomes de Oliveira; http://lattes.cnpq.br/8038795637292636; Brandstetter, Maria Carolina Gomes de Oliveira; Campos, Marcus André Siqueira; Carvalho, Michele Tereza MarquesThe creation of the Program - Programa de Apoio à Reestruturação e Expansão das Universidades Federais (REUNI) - together with the large represed demand, to the low number of technical and political pressure to meet deadlines, caused the Universidade Federal de Goiás (UFG) chose to outsource project design and execution of new works. The project contracting and execution of public works needs prior bidding procedure. The large volume of works and contracts raised increase in hiring additives. Although the regulatory government agencies consider the additives one of the main reasons for over invoicing and overpricing in public works, your contract can not be synonymous with public funds embezzlement. On the other hand, hiring is legitimate and additives provided by law. This study aims to make a analysis of the main factors that led to the hiring of additional services in new works construction contracts within the Universidade Federal de Goiás (UFG). The research is based on analysis of 42 new process works contracts, all for global price regime, contracted and completed between the years 2010 to 2014 and resulting from procurement modalities Pricing and Concurrency Taken. For the analysis of the justifications presented by the tax works, it was possible to identify the main factors and classify them into two parts. The first, relating the factors resulting from procedures failures of the elaboration of the basic projects, and the second, the factors linked to changes due to needs arising after contracting the work. The cauting of values and impacts corresponding to each of the factors indicated that most of the justifications of additives contracts (79,36%) is shed changes due to needs arising after contracting the work, indicating that most of the increases were carried out in accordance with the laws force for conclusion of such contracts and additives. The results achieved may assist Senior Management in the planning and distribution of resources to expand the physical space; demonstrating the impact of additives on two aspects. The analysis showed that the legality of the contracts additives met the legal requirements, and that most of the increases values have not altered the bidding modality. This analysis enabled us to verify which items had a higher incidence of contractual changes. Finally, this study opens new prospects for research related to analysis of public works budgets, aimed at continuous improvement of the project design process, hiring and supervision of public works and also contributed to the decrease in research gap in the topic.Item Análise de blocos de concreto armado sobre estacas(Universidade Federal de Goiás, 2010-12-16) SAKAI, Erika; SALES, Maurício Martines; http://lattes.cnpq.br/2033708685029423; PRADO, Ademir Aparecido do; http://lattes.cnpq.br/4118518363912053Through studies on the choice of type of foundation to use a certain work, always when the foundation is to pile it is necessary to build another structural element, the block of crowing or also called pile caps. Several studies have been made taking into account the block on stilts without the influence of soil. So this work demonstrates the relationship of methods of calculation of reactions in piles and tensions in chunks of some authors that take into account the influence of soil or not, with the numerical analysis. To analyzethe fundations the program DIANA was used in conjunction with MIDAS / FX +. With these results, ground-structure in the study of these blocks can be concluded on the importance of the interaction, being distinguished that as example, that if the ground are taken in consideration in the analyses of rigid blocks, the biggest reactions if are concentrate near the corners of the block, independent of the type of load application studied and not in the props central offices as some simplified methods consider. This leads to a closer examination of reality and therefore more accurate.Item Análise de confiabilidade em modelos de bielas e tirantes(Universidade Federal de Goiás, 2013-08-27) Santos, Victor Mark Pontes dos; Pantoja, João da Costa; Almeida, Sylvia Regina Mesquita de; http://lattes.cnpq.br/1855764480221018; Almeida, Sylvia Regina Mesquita de; Araújo, Daniel de Lima; Vaz, Luiz EloyThis work explores the use of reliability techniques for selecting strut and tie models and explores the use of topology optimization techniques to generate these models automatically. A literature review is presented exploring probability concepts useful in reliability analysis, concepts about classic approaches to generate strut and topology optimization. The formulation is based on concepts of the limit analysis thus they are the theoretical basis of the strut and tie model. Formulations used in reliability analysis are presented, such as the Monte Carlo simulation and the methods FOSM and FORM. These techniques are applied in nine numerical applications. The first two examples explore alternative techniques on the topology optimization field so as enable appropriate strut and tie results consistent with the project of concrete structures. The following examples are used to validate the tools used in the reliability analysis and in the limit analysis. Finally the four following examples apply reliability analysis with failure function based on limit analysis to compare classic models with those obtained by using topology optimization and analyze the security level of the models with respect to changes in concrete strength, reinforcement provided by the ties and thickness of the struts.Item Análise de estratégias para melhoria do conforto térmico em salas de aulas(Universidade Federal de Goiás, 2016-08-31) Chaves, Victor Leandro Arantes; Brandstetter, Maria Carolina Gomes de Oliveira; http://lattes.cnpq.br/8038795637292636; Harbich, Loyde Vieira de Abreu; Silva Júnior, Leônidas Albano da; Labaki, Lucila ChebelThe unsatisfactory thermal performance of buildings belonging to higher education institutions in Brazil cause users discomfort in classrooms and affect student performance. To ensure the well- being to the user, the use of mechanical systems for cooling of environments such as the use of air conditioners is necessary to reduce air temperature indoor, by one hand, and increase the energy expenditure of the building by about 50%, by the other side. This study analyses thermal comfort and energy efficiency in the School of Civil Engineering and Environmental UFG through measurements "in loco" and the perception of the users as well as by computer simulation. The methodology consists of: a) analysis of architectural design; b) lifting climatic summer data on air temperature and humidity within the classroom, and the views of users in three different situations - with open windows and doors and on evaporative air conditioner, open windows and doors and natural ventilation, and windows and doors closed and air conditioning on -; c) treatment of climatic data; d) comparison of the collected results and the perception of the users; e) evaluation thermal energy by computer simulation and prescriptive method of RTQ-C. They interviewed 200 users. About 83.3% of respondents were dissatisfied in the situation with natural ventilation, 68.5% in the situation on evaporative air conditioner and 70.2% in the situation with air conditioning on. Although the results suggest that the situation using air conditioners is the most comfortable, the number of users who feel uncomfortable is very high in all situations, not meeting the levels recommended by the ISO 7730 (2005).Item Análise de solicitações de assistência técnica em empreendimentos residenciais como ferramenta de gestão(Universidade Federal de Goiás, 2013-04-30) Cruz, Daniel Cupertino da; Brandstetter, Maria Carolina Gomes de Oliveira; http://lattes.cnpq.br/8038795637292636; Brandstetter, Maria Carolina de Oliveira; Carasek, Helena; Granja, Ariovaldo DenisDue to the emergence of several pathologies early detected in buildings, arises the need for increasingly detailed studies on the management of construction processes and failures that are being committed in several stages of an implementation project. Today the big difference for building companies is having the pursuit of customer satisfaction, the concepts of quality and performance often overlooked. Due to the competitive market, the improvement of services and production systems used, constitute the main challenge for companies, seeking for a balance regarding to the production cost, customer satisfaction and performance/ quality. Within this context, this article aims to analyze the databases of technical assistance to engineering firms within the city of Goiânia, as a way to get, through quantitative data, the main services that have higher incidences of requests and propose ways for data analysis. It was sought to conduct a conceptual study of important themes for after-work, being these ones the building maintenance, the structure and activities pertaining to the after-work and pathological manifestations. First it was conducted a survey of data on construction companies in Goiania, to obtain parameters on the form and level of development of the After-Work Department of the companies. Upon the completion of this survey, in a second step, two companies were chosen to carry out the case study, which consisted on data analyzis of the technical assistance performed, and the identification of services with higher incidences. These datas were treated in a quantitative manner and tabulated by Pareto Charts. In a third step, it was proposed a data analysis through FMEA tool, analyzing the severity, the possible costs and complexity of intervention of pathological manifestations detected, in order to obtain a better understanding over the priority risks in technical assistance. According to the results obtained in the case study, it was found that the main services that generates requests for technical assistance within the after-work services are hydro-sanitary facilities, with a percentage of 28% for Company A and 19% for Company D, followed by the services of wooden frames (doors) with a percentage of 14% for Company A and 27% for Company D. According to the origins of the occurrences of requests for technical assistance, it was observed that 44% of pathological manifestations can be detected under the implementation phase of the project. According to the FMEA analysis, it was found that 49% of the requests for technical assistance provided by the companies have low risk priority. As a tool for the After-Work Department, it was developed a dynamic management table to register the requests for technical assistance, in order to assist engineering firms in structuring such department. Through this research, it can be concluded that the increase of knowledge in relation to the data of technical assistance provided in the After-Work, is a great source of information and, such data when recorded correctly, provide benefits beyond the reduction in maintenance costs, like the benefits of customer satisfaction and improvements in future endeavors.Item Análise dinâmica não-linear de uma membrana hiperelástica esférica(Universidade Federal de Goiás, 2018-02-05) Amaral, Pedro Felipe Tavares do; Silva, Frederico Martins Alves da; http://lattes.cnpq.br/9929132527197884; Soares, Renata Machado; Soares, Renata Machado; Prado, Zenón José Guzmán Nunez del; Gavassoni Neto, ElvídioIn the present work, studies about the nonlinear static and dynamic behavior of a spherical membrane are presented. This membrane is composed by a hyperelastic, incompressible homogeneous and isotropic material, which is defined by either of the two distinct constitutive models: Mooney-Rivlin or the Neo-Hookean model. The equilibrium equations are obtained from the large-strain theory, by utilizing a variational formulation and by subjecting the membrane to an uniformly distributed internal radial pressure differential. From the nonlinear static analysis, internal membrane tensions and strains are obtained. From the dynamic analysis, the frequency-amplitude relation, the linear stability analysis, the time response, bifurcation diagrams, resonance curves and basins of attraction are obtained. As a first step, there is an analysis on a membrane composed by the same experimental material, which is described by the two different constitutive models presented in this work. It is observed that the dynamic responses are considerably distinct, due to the difference between the geometrical nonlinearities that each constitutive model insert on the equilibrium equation. The Neo-Hookean model has a lower pre-stretching limit, and its attraction basins are more eroded and irregular than the Mooney-Rivlin, that is still stable on regions of larger vibration amplitudes. Then, the influence of the Mooney-Rivlin parameter (α) is evaluated, and it is found that this parameter is the main source of the differences between the constitutive models, modifying the stability, nonlinear vibrations and also influencing on the loss or gain of the global rigidity of the membrane.Item Análise do comportamento de sistemas dinâmicos com absorsores de vibração não-lineares sintonizados(Universidade Federal de Goiás, 2022-05-13) Marques Filho, Marcello Gomes; Nuñez del Prado, Zenón José Guzmán; http://lattes.cnpq.br/7703344458057759; Nuñez del Prado, Zenón José Guzmán; Avila, Suzana Moreira; Soares, Renata MachadoSlender and flexible structures, such as buildings or long span bridges, have become more susceptible to dynamic loads effects and an increment of their oscillation amplitudes can be noticed. Hence, the effect of large-amplitude vibrations and the consideration of nonlinearities become a relevant factor on the analysis, and, in a lot of cases, an intervention is necessary, by using vibration control mechanisms. First, in this work, the performance of a nonlinear tuned mass damper is evaluated when applied to a nonlinear Duffing equation considering nonlinear stiffness parameters with both softening and hardening behavior for the main system and the damper. For this, damped and undamped Duffing nonlinear oscillators are studied when subjected to a harmonic load or free vibration and attached to a nonlinear damper. First, the optimal linear control parameters were obtained by using Den Hartog’s criteria and these parameters are used to evaluate its performance on the nonlinear vibration regime. Then, the performance of a nonlinear tuned mass damper is evaluated when applied to a simply supported nonlinear 2D Euler-Bernoulli beam, subjected to a harmonic load or an aerodynamic follower load. For this case, the optimization process is also performed. A parametrical analysis is performance to evaluate the quality of the nonlinear tuned mass damper on the resonance curves, basin of attraction, time responses, phase planes and Poincaré sections for both the discrete and the continuous systems.Item Análise do comportamento mecânico de um solo expansivo da província petrolífera de Urucu-AM para fins de pavimentação(Universidade Federal de Goiás, 2009-10-30) SOUZA, Leonardo Sebastiao de; REZENDE, Lilian Ribeiro de; http://lattes.cnpq.br/9258692609398794; GITIRANA JUNIOR, Gilson de Farias Neves; http://lattes.cnpq.br/4710728908810849The establishment of transportation infrastructure is critical to the development of the Urucu- AM region, a newly developed oil exploration area in the Amazonas state. The construction of such infrastructure is challenging due to the lack of suitable materials for the construction pavement base and subbase courses and adverse weather conditions, with alternating heavy rainfall and drought periods. Besides the shortage of suitable granular material, the presence of expansive soils is often verified. The presence of expansive soils associated with inadequate moisture content during compaction, results in the occurrence of cracks in the pavements, drastically reducing its performance and lifetime. A quantitative understanding of this type of problem requires the analysis of the interaction between the unsaturated soil surface and the atmosphere and the study the mechanical behavior (stress-strain) of unsaturated soil. Such understanding requires the determination of the variations in soil moisture and total volume. The quantification of tensile stresses also requires the establishment or evaluation of the constitutive relations of the unsaturated expansive soils involved. Experiments were conducted in the laboratory with the objective of characterizing the hydraulic and mechanical behavior of expansive soils from Urucu-AM. Chemical, physical and mineralogy characterization tests were carried out for the soil. Geotechnical characterization and Proctor compaction tests and compression were performed. To study the soil in the unsaturated condition, the main focus of this work, tests were performed using the filter paper technique and the axis translation technique under oedometric conditions. For the suction controlled oedometric tests, a cell developed specially for this purpose was employed. The oedometer allows for the independent control of vertical stress and matric suction and the monitoring of the variation of moisture and total volume study. State surfaces for void ratio, degree of saturation and gravimetric moisture content were determined. The results obtained show the expected mechanical behavior of the soil under wetting paths.Item Análise do conforto ambiental em salas de aula da Universidade Federal de Goiás(Universidade Federal de Goiás, 2010-09-24) Ochoa, Juliana Herlemann; Araújo, Daniel de Lima; http://lattes.cnpq.br/8801080897723883; Brandstetter, Maria Carolina Gomes de Oliveira; Sattler, Miguel Aloysio; Morais, Ludmila Rodrigues deProvide users good physical conditions in educational institutions is essential for the proper development of teaching and learning. This work deals with the verification in-loco of the environmental comfort of classrooms in two buildings with different architectural and construction techniques, that are part of the structure of the Federal University of Goiás. So the research aimed at exploring these buildings in order to identify the peculiarities of its thermal, acoustic and light performance which are being influenced by the technologies adopted and the physical conformation of the same. The technical data collected were analyzed by type of comfort. In lighting comfort, measurements were carried out near the solstices and equinoxes and the data collected were analyzed by means of ambient illuminance, uniformity coefficient and contribution of artificial light. The thermal comfort data collected were temperature and relative humidity for a period of approximately 11 months, which were assessed using the concept of comfort zone, degree-hours analysis and absolute maximum and minimum values. The acoustic measurements collected the sound pressure levels and occurred over a day of daily activities in both buildings. It was noted that there is an influence of the architectural elements of environmental comfort in buildings. Among other factors, one that can be highlighted is that despite having similar solar orientation, which is a comfort condition, the results of the environmental performance of each of the buildings were quite different. Parallel to these technical assessments were also done a periodic application of questionnaires to the users of the classroom, one per season, which sought to characterize the perception of these in relation to each of the types of comfort. Finally, a correlation was established between the technical data collected and perceptive. In most of cases, the opinions expressed by users were not consistent with the results evaluated by measurement techniques, thus demonstrating a difference between the comfort zone adopted and the actual user satisfaction of the buildings.Item Análise do Desempenho de poços de infiltração na cidade de Goiânia-GO(Universidade Federal de Goiás, 2010-07-31) ARAUJO, Alexandre Garces de; SALES, Maurício Martines; http://lattes.cnpq.br/2033708685029423; GITIRANA JUNIOR, Gilson de Farias Neves; http://lattes.cnpq.br/4710728908810849This paper presents the performance study of infiltration pits. Two experimental fields were selected for evaluation of the pits, one studied by Carvalho (2008) and the other deployed in this work. The main objective of this research is to evaluate the sensitivity of the performance of the infiltration pit before the variability of soil properties. Three performance parameters were considered: time of infiltration 50%, 70% 85% the volume of water in the well. The variability of the properties was made with the use of possible values obtained by the coefficient of variation of each property evaluated. In the experimental field deployed in this study were collected undisturbed samples to perform laboratory tests such as characterization, consolidation test method, soil-water characteristic curve, saturated and unsaturated hydraulic conductivity. The SWCC showed the presence of macro structure and its format as bimodal. The saturated hydraulic conductivity showed that the soil behavior is governed by the macro structure, this resulted in hydraulic conductivity value close to the sandy. The hydraulic conductivity test was performed at the Federal University of Rio Grande do Sul using the permeameter developed by Feuerharmel (2007). The function of hydraulic conductivity obtained was compared with Brooks & Corey (1964) prediction method showing good results to the first baseline of SWCC. An automated method was developed for monitoring the variation of the water column in the well during infiltration. The method was based on the use of pressure sensors and a data acquisition system, comparing this method with using a conventional tape measure showed good results. Numerical analysis showed that the saturated hydraulic conductivity is the property that most influence on the performance of the structures of infiltration differences were not observed in the analysis considering different depth of groundwater level.Item Análise do efeito do comportamento não linear dos solos em radier estaqueado(Universidade Federal de Goiás, 2014-09-26) Sousa, Mauro Alexandre Paula de; Sales, Mauricio Martines; http://lattes.cnpq.br/2033708685029423; Sales, Maurício Martines; Gitirana Junior, Gilson; Anjos, Gerson Jacques Miranda dosWith the increasing development of large urban centers in the country, the buildings are presenting more audacious forms in respect to the architectural project. The buildings got taller and as a result, the loads imposed to the foundations have also become larger. Knowing this, the concept of piled raft foundations began to be usually employed in many projects. These type of foundations assume that a load portion is supported by the surface layer that is in direct contact with the raft. The piled raft may contain a large number of piles, and some of them bearing high loads and resulting in a pronounced non-linear behavior. Aiming to describe the stress-strain behavior more accurately, a form of nonlinear analysis was implemented in FENF program (Ferramenta Numérica para Análise de Fundações). It is a specific finite element program for 3D foundation analysis of piled rafts. The program was developed at UFG using the language “C” and differs from the others programs by providing a more direct way to access the efforts that the foundation elements are submitted. The dissertation aims to do a literature review of linear and non-linear behavior of foundations and make the implementation of a hyperbolic model for modeling soil behavior. After verifying some literature cases, three different piled rafts (2x2, 4x4 and 6x6) were analyzed considering linear and non-linear soil behavior. The settlement, pile load distribution and internal efforts were compared, discussing the importance of taking into account the non-linear soil behavior.Item Análise do impacto da logística na composição do custo do sistema de projeção de argamassas para revestimento(Universidade Federal de Goiás, 2016-09-30) Siqueira, Rainiere de; Cascudo, Helena Carasek; http://lattes.cnpq.br/3023241186996790; Brandstetter, Maria Carolina; http://lattes.cnpq.br/8038795637292636; Brandstetter, Maria Carolina; Cascudo, Helena Carasek; Campos, Marcus André Siqueira; Marchiori, Fernanda FernandesThe construction industry always calls for new concepts and techniques. From the adoption of the lean mentality philosophy in the 1990s, companies in the industry have been applying their principles and tools to the construction sites. The flow of value, and consequently logistics, is one of the most relevant and widespread within Lean Thinking, as it seeks to identify and eliminate waste along the entire value chain, from the raw material to the final customer. For this, it is necessary to manage the physical flows of people, materials and equipment at the construction site. There are few studies that address in a systemic way the possible gains in productive efficiency provided by the mechanization of the application of mortars in coatings, combined and integrated with the logistics management. Therefore, this work sought to evaluate the relationship between: logistics, productivity and costs of the Mortar Coating System, comparing two application processes: manual and with mechanical projectors. For this evaluation, it was necessary to use the tools of Lean Constrution: process diagrams, mapofluxograms, Unitary Ratio of Production - RUP, losses and cost of production of labor and global. The methodology is classified as a multiple case study, a descriptive research and uses of visits to the works, surveys and measurements in the field, documentary and in-situ evaluations, as well as management meetings. This study was carried out taking into account the context of the works of the metropolitan region of Goiânia, with the support and partnership of the Sinduscon-Go Construction Community. The work concluded that the mechanical projection represents a form of industrialization and rationalization of the productive process and is economically feasible, with reductions that can reach up to 13.07% of the overall cost of the internal lining of the enterprises surveyed. This viability is possible through the gain of productivity coming from an integrated management of the production by a well implemented logistics, and without loss incorporated in the thicknesses of the taliscas.Item Análise dos fatores de interação entre estacas em radier estaqueado : comparação entre duas ferramentas numéricas(Universidade Federal de Goiás, 2010-08-06) SOUZA, Ruiter da Silva; SALES, Maurício Martines; http://lattes.cnpq.br/2033708685029423Researches done in the last decades concerning the settlement of pile foundations, mainly when it s considered as piled raft, had greatly evolved due the progress on computational tools used in the analysis. However, the tridimensional analysis of a pile foundation, taking into account the interaction between your components (soil, piles and raft), is still a very complex problem. To achieve a satisfactory evaluation of the interaction between the foundation's elements, numerical tools like Boundary Elements Method (B.E.M.), Finite Elements Method (F.E.M.) and hybrid methods, that combines two or more methods, are available, each one with its own advantages and drawbacks. The F.E.M. is considered in the technical sphere as the most complete method for piled raft evaluation, but your high processing time requirements, required in the analyses, prevents your usual employment. For this reason, a necessity to compare this methodology with others, as the one used in simplified programs, that decreases the processing time, arises. To evaluate the results proximity achieved by different methods, this work presents the simulation of some pile blocks, calculated as piled rafts, employing two programs (GARP and DIANA) to foresee your behavior. GARP is a hybrid program which analyzes the raft by using F.E.M. and the pilessoil set by B.E.M. and, like the other programs of same kind published in the literature, it doesn't take the influence between intermediary piles into account for the analysis. DIANA is a purely finite elements program, based on the displacement method. Thus, the main objective of this work was to evaluate how taking or not the interaction factor between piles into consideration can modify the predictions of settlement and pile loads. For that, it was evaluated how the attribution or omission of these interaction factors into specific regions that comprise some or all the piles, modifies the predictions of the foundation performance and makes them approximate or distant from the F.E.M. results, considering the most exact one. The way that the simplified programs handle the problem, makes the settlement previsions excessive. To contour this and to make the settlement results from the simplified methods become close of the expected ones from F.E.M., the discovered way was the imposition of a limit in the distance used in the calculation of the piles interaction, based on the raft's size and the number of piles in that case. Many examples of pile rafts in homogeneous soils was evaluated and the maximum distance limits of interaction between piles that generated the best results in the settlement prevision are shown. In all examples, the effect of raft stiffness in these results was also taken into account. Also, an analysis case in heterogeneous soil was done, where it was observed that this fact also interferes in the piles interaction process. For pile load predictions, the results were distinct from settlement prediction and was noticed that not limiting the maximum interaction distance between the piles generated the best previsions.Item Análise estática não-linear de cascas conoidais(Universidade Federal de Goiás, 2017-06-27) Morais, Danielly Luz Araújo de; Silva, Frederico Martins Alves da; Soares, Renata Machado; http://lattes.cnpq.br/1938664529309726; Carvalho, Eulher Chaves; Soares, Renata Machado; Del Prado, Zenón José Guzmán NuñesIn the analytical study of conoidal shallow shells, one has the difficulty in analytically representing their displacement fields. In this way a numerical analysis, such as the Finite Element Method (MEF), has been used in the study of this type of structure. In this work, a static analysis of conoidal shallow shells from curved parabolic or cylindrical edges of linear, homogeneous and isotropic elastic material is performed, subjected to a transversal uniformly load distributed along the surface. With the thin-plate formulation derived from Kirchhoff's hypotheses and the theory developed by Marguerre for thin shells, the non-linear equilibrium equations that govern the behavior of the conoidal shell were determined, considering that this is a plate with an initial displacement. A linear parametric analysis of the critical loads and of buckling modes through the MEF is performed using ABAQUS 6.11® program, varying the contour and height conditions of the curved edges. Analytically, a complexity of the components of the buckling mode displacement fields of a given geometry is evaluated by its decomposition into double Fourier series. With the non-linear analysis via MEF, the non-linear equilibrium trajectories of the displacements are obtained and the first non-linear loading limit points are obtained. Nonlinear parabolic or cylindrical geometric parabolic geometry trajectories with describable supports at their four edges are also compared, evaluating how the geometric non-linearities influence the modes of the displacement fields during loading. Finally, a non-linear parametric analysis of the influence of the variation of the curved edge heights on the equilibrium trajectories of the membrane stresses and resulting from internal moments of the conoidal shell is carried out. It is verified, with this work, that linear analyzes can underestimate, or overestimate, the nonlinear behavior of the conoid. As the parametric analysis influences the behavior of the conoid in front of the load, either in the linear analysis, resulting in different critical loads and modes of buckling, or in the nonlinear analysis, resulting in differentiated limits loads and nonlinear equilibrium trajectories of the displacements and membrane stresses and moments.Item Análise não linear de placas retangulares compostas de material viscoelástico(Universidade Federal de Goiás, 2020-06-19) Dias, Phablo Veríssimo Inácio; Soares, Renata Machado; http://lattes.cnpq.br/1938664529309726; Del Prado, Zenón José Guzmán Núñez; http://lattes.cnpq.br/7703344458057759; Del Prado, Zenón José Guzmán Núñez; Soares, Renata Machado; Silva, Frederico Martins Alves da; Orlando, DiegoBased on Kelvin-Voigt mechanical model, in this work the viscoelastic damping in nonlinear vibrations and dynamic instability of transversally and axially loaded rectangular plates is studied. Rectangular plates with initial geometric imperfections and with linear rotational springs at the edges are admitted in order to consider clamped boundary conditions. The non-linear Von-Kármán relations are used to describe the deformation relations of the plates and the system of non-linear dynamic equilibrium equations is found through the Hamilton principle by way of application of the Rayleigh-Ritz method, being solved later through of the fourth-order Runge-Kutta method. Initially, using the frequency-amplitude relations the influence of the viscoelasticity parameter on the plate’s non-linear mechanical behavior is investigated, observing that with the increase in the viscoelasticity parameter, the maximum amplitudes and non-linearity of the response decrease. The resonance curves, the post-critical path, the bifurcation diagrams, the attraction basins, the phase plans and the Poincaré maps were obtained for two different plates under distinct loading conditions. It is shown that, for all the amplitudes of the transverse loading studied, the plate presents periodic solutions of period 1T. When the plate is analyzed with higher levels of axial loading, this response may have periods of high order, and quasi-periodic and chaotic responses are also found. In all cases, a behavior of hardening of the plate is observed, however, in the study of effect of initial geometric imperfections, the response may become initially softened for high levels of imperfection. Finally, a nonlinear damping model is also used, which is compared with an equivalent viscous damping model.Item Análise numérica 3D do túnel auxiliar a jusante da UHE simplício-anta(Universidade Federal de Goiás, 2011-08-29) MORAES NETO, Floriano Rodrigues de; VARGAS, Carlos Alberto Lauro; http://lattes.cnpq.br/3816106720170772With the accelerated occupation of the space, the use of tunnels play an important role in engineering, in this sense, the deformations control during it s construction process is very important for the best performance of tunnels. In this sense the numerical analyzes represent a likely economy in the design process. This paper uses a theory of elasticity in the FlexPDE, the same allows the solution of a system of partial differential equations using the finite elements method and producing a graphical output of the problem. In this sense simulations were performed using three-dimensional numerical deep tunnel under the elastic rock in a physical environment continuously, equivalent to the rock mass. Analyzes were made of three-dimensional numerical condition and constructive process of a circular tunnel deep in the rock. These results were compared with the elastic solution of Kirsch for a cross section corresponding to the plane strain state, showing good concordance of numerical results with the analytical. After the verification stage of the numeric model has also been given to the numerical simulation 3D and analyses based on monitoring data from the tunnel auxiliary of the Hydroelectric Power Plant (HPP) of Simplicio/Anta, located in Paraiba do Sul River, in the state of Rio de January - RJ. In this work were carried out measurements of convergence in various sections of the tunnel at the same time of excavation progress. These results and the parameters of characterisation, strength and deformation were colected from Vissoto Junior (2009). Finally the results of the analyzes numerical 3D were compared with the results of field, and after the adjustment of geotechnical parameters in back analyses was obtained a good concordance of numerical results with field data. In this case studied the excavation of the tunnel had a linear elastic behavior since the rock mass is of good quality and the tunnel relatively small.