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Item Análise experimental de vigas constituídas de perfis formados a frio com emendas soldadas submetidas à flexão simples(Universidade Federal de Goiás, 2009-09-23) ALMEIDA, Ariovaldo Fernandes de; GOMES, Orlando Ferreira; http://lattes.cnpq.br/3244852416821211The cold-formed steel sheets have been sufficiently used when it is thought of manufacturing a metallic structure with reduced weight. Its use until some time ago in construction was limited to the secondary structures, but, with considerable growth in research involving this type of material together with development of technical standards, made its use a good solution for certain types of light structures. The present work presents considerations on cold-formed steel sheets, the patened steel, processes of welding and the result of experimental tests with beams with composed section of two profiles U constituted with cold-formed steel sheets, manufactured with two types of patened steel produced in Brazil. In some of these beams, welded sections with coated electrode had been used and were made the comparison with the reference beam, where it was possible to study the influence of the process of welding in the ultimate resistance and the ductility of the beam.Item Erodibilidade de solos tropicais não saturados nos municípios de Senador Canedo e Bonfinópolis - GO(Universidade Federal de Goiás, 2014-09-26) Almeida, João Guilherme Rassi; Mascarenha, Márcia Maria dos Anjos; Romão, Patrícia de Araújo; http://lattes.cnpq.br/0188184635964559; Romão, Patrícia de Araújo; Sales, Maurício Martines; Carvalho, José Camapum deEnvironment, socials and economics problems are related with erosive process, like: loss of soil productivity, silting of rivers and lakes, landslides in areas of risk and commitment of public services. Aspects such as climate, topography, soil type and the use and occupation of land by humans are decisive in understanding the susceptibility of a site to water erosion. However, in the case of tropical regions, two aspects have relative importance in studies erodibility: non saturation and weathering degree. In this way, the present study aims to analyze the suction effect and laterization degree in erodibility soil, emphasizing important parameters for carried out erodibility tests. Therefore, were selected two (02) areas near the city of Goiânia with distinct pedogenetic characteristics, one with younger soils (or even intermediate, as observed during the study) and another where weathering processes acted more intense, corresponding to a Cambisol soil type and a Oxisol type, respectively. In each site were collected disturbed and undisturbed samples with the aim to perform characterization tests, tropical soils tests, soil water retention curves and erodibility tests. On results were noted that both samples are a lateritic soils, presenting even primary minerals and iron oxides. The adjusting of soil water retention curves results on a bimodal shape for the Oxisol type due to the presence of micro and macropores, and with heterogeneous distribution shape for Cambisol Type, due the presence of grains on different sizes. At finally, the analysis of erosion, in general, results that the samples with lower initial suctions were more resistance to laminar erosions and in the processes of slope stability when submerged. On the Inderbitzen tests, the Oxisol showed be more susceptible to the erosive processes than the Cambisol type, probably because of the lower flow of the water. In the total and partial disintegration test, the samples of Oxisol demonstrate to be a good cohesive soil, opposite behavior have the Cambisol samples.Item Levantamento das manifestações patológicas em fundações e estruturas nas edificações, com até dez anos de idade, executadas no estado de Goiás(Universidade Federal de Goiás, 2009-11-27) ALVES, Jader Rodrigues; GEYER, André Bortolacci; http://lattes.cnpq.br/0135796530510700The main objective of this research is to proceed to the rising of the indexes, to identify the pathologies and to characterize the constructions that presented occurrences of pathological manifestations in foundations and structures in the constructions executed in the State of Goiás, with age of up to ten years. The researches was classified as documental, considering that, to make possible the accomplishment of the same, the files of Regional Council of Engineering, Architecture and Agronomy of Goiás were analyzed -Crea/GO, with a total sample of 545 reports. It was observed that most of the processes are concerning the last seven years. This Organ was chosen by the fact that all of the technical documents are elaborated by professionals, and, mainly, for Official Organ to be considered. The Method of the Incidence was adopted as methodology recommended for this study observing that in the reports and decisions, elaborated by Crea-GO doesn't be in the number of occurrences of a same pathology and yes only the incidence of the same. The main conclusions of this research were: the main pathological manifestation was found in the foundations repression with a rate of 37.50% followed by collapse with a rate of 22.50%, both in relation to all the pathologies found in the foundation stage, the main pathological manifestation found in stage structure were the cracks with an index of 32.14% compared to all the pathologies found in stage design, regardless of the number executed and the second structural pathological manifestation found in step structure was the structural deformation with an index 19.84% as compared to all the pathologies found in stage design, regardless of the structural piece performed, the building of single-family residential use were the same who had diseases with a rate of 47.50%, followed by residential conference with 35 %, 77.50% of the buildings showed that diseases were carried out by private tutors and, for the buildings surveyed 40% had impairment evaluation of use of buildings facing the diseases occurred in moderate severity, and the rate for high severity was 5%. The disease occurred in low gravity, 45%, most pathological manifestations of both the foundation and structure, occurred in the first year of age of the building. 52.17% in the foundation and concrete structure in 40% of the buildings surveyed, 35% caused damage to neighboring buildings, and 53.49% of this damage occurred within the first year after completion of the work, and the buildings with an area of 5001 m² to 10,000 m² which caused the highest percentage of damage, and the recklessness and incompetence were more technical errors committed by professionals with rates of 32.50% each, followed by neglect of index 22.50 %.Item Estudo em escala real da disposição de resíduo de decantador de ETA em lagoa de estabilização de esgoto(Universidade Federal de Goiás, 2015-04-29) Angelim, Susane Campos Mota; Scalize, Paulo Sérgio; http://lattes.cnpq.br/0957896448117207; Scalize, Paulo Sérgio; Teran, Francisco Javier Cuba; Albuquerque, Antônio João CarvalhoIn Brazil water treatment plants (WTP) residuals are usually discharged into waterways, with negative impacts on water quality, aquatic biota and sediments, which may also pose risks to human health. This paper presents a study on real scale disposal of aluminum sludge from the settling of a WTP in a primary facultative pond, both located in Piracanjuba-GO, wishing to contribute as an alternative for residuals management. The study aimed to evaluate the effects of WTP residuals (WTPR) in the performance of the wastewater stabilization pond (WSP), in terms of quality of the effluent and volume of bottom sludge accumulated. Worked up in two identical parallel ponds, one in which WTPR was applied (test pond) and another without application (control pond) to serve as comparison of results. The study was carried out in two stages, with dosage of 37 mg TS/L in Phase 1 and 44 mg TS/L in Phase 2, totaling 125 days of application and 191 days of monitoring. It was evaluated several effluent parameters such as BOD, solids, nitrogen, total phosphorus, Escherichia coli, metals, among others. Sludge volumes in the ponds were obtained from bathymetric survey using a sludge depth meter (sludge gun) and modeling by Surfer 8.0 software. The addition of the WTPR did not impair the performance of the test pond, with minimal reduction of BOD and nitrogen. It was not possible to identify any influence of WTPR for the removal of total phosphorus of the sewage, which was attributed to high pH and low dosage. There was no statistical difference (95% confidence level) between the means of 15 parameters evaluated in two phases, except for nitrogen ammonia. There was no difference between the increases of sludge volume accumulated in the bottom of the ponds, although total solids content was higher in the test pond. This behavior was associated with particle size characteristics of the material. The study indicates technical feasibility of WTP residuals disposal in the WSP studied, revealing an alternative for its management that can also be applied in other same type systems if evaluated the specific conditions in each case.Item INFLUÊNCIA DE ADIÇÕES MINERAIS POZOLÂNICAS E DE FINOS DE PEDREIRA NAS PROPRIEDADES MECÂNICAS E NA MICROESTRUTURA DO CONCRETO AUTO-ADENSÁVEL(Universidade Federal de Goiás, 2007-08-27) ARAÚJO, Janaína das Graças; GEYER, André Bortolacci; http://lattes.cnpq.br/0135796530510700For the benefits of its properties in fresh state, self-compacting concrete (SCC) demands a high powder content in the composition, nearby 450kg/m³. The quarry dust, resultant material of the coarse aggregate production, can b considered as an economic and sustainable alternative for the development of the SCC. As well as the quarry dust, mineral additions, is used in conventional concretes and can also be used in the self-compacting concrete, with the same kind of benefits. Using the mix design for SCC developed by Tutikian (2004) a study for evaluation of the SCC mechanical properties were done, where natural sand had been partially replaced by quarry micaschist, granite and gneiss - and cement for silica fume, metakaolin and calcined clay pozolan. The test methods for fresh state used was Slump-flow (FURNAS, 2005a), U-Box (FURNAS, 2005b), Entrained air (NM 47, 2002) and Specific gravity (9833, 1997). Cylindrical test specimen 100x200 mm had been molded for tests - compressive strength (NBR 5739, 1994), modulus of elasticity (NBR 8522, 1984), splitting tensile strength (NBR 7222, 1994) and flexural strength (NBR 12142, 1991) -the age of 28 days. Samples using the mixture1: 4,5 had been analyzed by scanning electron microscope (SEM). The results show that it can be possible the use of different additions for the production of high quality SCC. We detach the small variability of the specific gravity, as well as the entrained air, wide presented low values. For concretes with same compressive strength, the values of modulus of elasticity had varied between 5 and 60% and the splitting tensile strength and flexural strength had been remained between 10 and 15%Item Influência do tipo de medição na determinação do módulo estático de elasticidade do concreto(Universidade Federal de Goiás, 2011-08-15) ARAÚJO, Suélio da Silva; GEYER, André Bortolacci; http://lattes.cnpq.br/0135796530510700; GUIMARÃES, Gilson N.; lattes.cnpq.br/0060821461126304The knowledge of the compressive strength and static modulus of elasticity is fundamental to the study of deformations of concrete, since deformations can cause cracks that compromise both the structural behavior of the element and serve as an entry to deleterious agents. For purposes of correlating values of compressive strength and static modulus of elasticity of concrete, cylinders were cast with different strengths, different types of strain measurements were taken, different specimen sizes and the loading speed of the testing machine. The specimens were tested at the age of 28 days to determine the compressive strength and static module of elasticity according to ABNT NBR 8522:2008, using different types of strain measurement devices: two mechanical dial indicators, surface bonded strain gages, clip gauges and LVDT (Linear Variable Differential Transducer). Two hundred and fifty eight specimens were cast with dimensions 150 mm x 300 mm and 100 mm x 200 mm using conventional normal strength concrete (NC - Class C30) and high strength concrete (HSC - Class C60). The experimental program was divided into two stages. First the static modulus of elasticity of concrete was measured to evaluate the accuracy of the method using different measuring devices and the accuracy of the method to a loading speed of 0.6 MPa/s. Then, the modulus of elasticity using different deformation measuring devices at a loading speed of 0.3 MPa/s and 0.6 MPa/s was measured. As for concrete NC and HSC, it was found that the specimens 100 mm x 200 mm obtained higher dispersion in relation to 150 mm x 300 mm specimens. In the first stage of the research, 100 mm x 200 mm specimens showed a higher dispersion when using mechanical dial gages and LVDT. The 150 mm x 300 mm NC class C30 specimens showed greater dispersion when using in mechanical dial gages and external strain gages. However, the HSC showed higher dispersion when mechanical dial gages and LVDT were used. In both concretes tested, the mechanical dial gages showed greater dispersion. In the second stage of the research, 150 mm x 300 mm specimens tested at the loading speed of 0.3 MPa/s showed greater dispersion when electrical strain gages and clip gauges were used. The 150 mm x 300 mm specimens tested at loading speed of 0.6 MPa/s showed greater dispersion when electrical strain gages and mechanical dial gages were used.Item Efeito da geometria e do material nas vibrações não lineares de cascas cilíndricas ortotrópicas(Universidade Federal de Goiás, 2013-06-13) Argenta, Ana Larissa Dal Piva; del Prado, Zenón José Guzmán Núñez; http://lattes.cnpq.br/7703344458057759; del Prado, Zenón José Guzmán N.; Silva, Frederico Martins Alves da; Gonçalves, Paulo BatistaCircular cylindrical shells are widely used structures in several engineering areas and have great capacity to withstand both axial and lateral loads. However, they may present a complex dynamic behavior. Thus, a detailed study of the behavior of cylindrical shells subjected to different loading and support conditions as well as the influence of material characteristics and geometric relations evaluation is justified. In this work the influence of geometry and orthotropy on the nonlinear dynamic behavior of orthotropic simply supported cylindrical shells subjected to both axial and lateral time depending loads is studied. To model the shell, the Donnell nonlinear shallow shell theory, neglecting the effects of shear deformations, is used. It is considered the shell in three different situations: empty, filled with static fluid and subjected to internal flow of incompressible and non-viscous fluid, whose motion is isentropic and irrotational. The radial displacements are described as an expansion with eight degrees of freedom which satisfies the boundary conditions. The Galerkin method is applied to obtain a set of nonlinear equations of motion, which are in turn solved by the Runge-Kutta method. A detailed analysis is performed to study the influence of material orthotropy and geometric relations such as length-radio (L/R) and radio-thickness (R/h) on the natural frequencies, critical loads, critical flow velocities, post-critical paths, frequency-amplitude relations, instability boundaries, bifurcation diagrams and resonance curves. Obtained results display the strong influence of both material orthotropy and geometric relations on the linear and nonlinear behavior of the shells and, depending on these characteristics, the shell can display softening or hardening behavior.Item Gestão do projeto e sua interface com o canteiro de obras sob a ótica da preparação da execução de obras (PEO)(Universidade Federal de Goiás, 2013-09-26) Arrotéia, Aline Valverde; Melhado, Silvio Burrattino; Amaral, Tatiana Gondim do; http://lattes.cnpq.br/7298757233386815; Brandstetter, Maria Carolina Gomes O.; Fabrício, Márcio MintoDuring the last twenty years the construction field in Brazil has evolved significantly in response to its market growing and competitiveness. However this evolving path has faced many obstacles such as cultural barriers and the lack of efforts to achieve quality at the Brazilian construction site. As one of the causes of this facts the lack of integration between construction and the designing process generates waste, pathologies, work redone and improvised changes originated by incompatible projects which were taken by incapacitated personnel at an inconvenient moment. At the same time, the great amount of information generated on the designing or construction phases is lost due to the lack of an effective coordination of these activities. From this scenario Souza (2001), has developed two management methods in her doctorate thesis named Preparation for the Execution of Buildings (known as PEO) and the Pro-active Coordination (known as CPA), these methods are based on the application of the processes adopted by the French construction industry on Brazilian construction sites. These methodologies aim to establish the integration of the project phases by a set of actions and activities implemented by a system of meetings where the main objective is to discuss the projects and the planning of the construction site seeking to obtain a better quality and better outcome on the productive process. These methodologies aim to bring expressive improvements on the productivity, as well as on the lowering of waste, on the settlement of goals, on planning actions in accordance with all the agents involved and mainly on the reduction of costs allied to higher quality standards. Thus is an objective of this research to implement the Preparation on the Execution of Buildings (PEO) seeking to understand the management of the designing process and its interface with the construction site. The methodology applied on the development of the analysis is classified as qualitative and it will be carried by the practical application of the research and the evaluation of its results. Thus, the study was divided into two stages, one of them intended for a pilot study of PEO in Company A, and the other to the implementation of PEO on the company B. This way, the method was developed from a system meetings entitled structured in three different stages: the release of PEO; the development of PEO and the completion of the intensive phase of PEO, which were performed over a period from two to three months. The data analysis was structured upon five main aspects which were evaluated during the implementation of the method on the studied companies. These aspects were: the actions taken during the PEO phase, the development of the actions and the participation of the agents; the internal structure of the companies analyzed; The management and design coordination and the contract form of the contractors, architects and engineers. The results obtained demonstrated the PEO method's effectiveness and viability while a booster on the improvement of project management. Therefore, it can be concluded that the PEO is feasible to be applied in building construction companies, since this method can contribute to the integration of the design phases and construction, as well as to the improvement of the communication between the agents involved in the building construction field.Item Otimização de estruturas reticuladas planas com comportamento geometricamente não linear(Universidade Federal de Goiás, 2006-10-20) ASSIS, Lilian Pureza de; ALMEIDA, Sylvia Regina Mesquita de; http://lattes.cnpq.br/1855764480221018The aim of this work is to present a formulation and corresponding computational implementation for sizing optimization of plane frames and cable-stayed columns considering geometric non liner behavior. The structural analysis is based on the finite element method using the updated lagrangian approach for plane frame and cable elements, which are represented by plane truss elements. The non linear system is solved by the Newton-Raphson method coupled to load increment strategies such as the arch length method and the generalized displacement parameter method, which allow the algorithm to transpose any critical point that happen to appear along the equilibrium path. In the optimization process the design variables are the heights of the crosssection of the frame elements, the objective function represents the volume of the structure and the constraints impose limits to displacements and critical load. Lateral constraints impose limits to the design variables. The finite difference method is used in the sensitivity analysis of the displacement and critical load constraints. The optimization process is carried out using three different optimization strategies: the sequential quadratic programming algorithm; the interior points algorithm; and the branch and bound method. Some numerical experiments are carried out so as to test the analysis and the sensitivity strategies. Numerical experiments are presented to show the validity of the implementation presented in this dissertation.Item Análise não-linear de lajes de concreto armado pelo método dos elementos finitos(Universidade Federal de Goiás, 2006-09-27) BANDEIRA, Mirtes Silva; PRADO, Ademir Aparecido do; http://lattes.cnpq.br/4118518363912053In this work was carried simulations in the slabs and compared results with those obtained in the experimental research of Campos (2000) and Pires (2003), held on the slabs reinforced concrete brought to the failure by bending for inquiry of strengthening using uper the surface. For the modeling version 8.1.2 of DIANA was used and the inquiry of the behavior of the slabs was made through nonlinear analysis, adopting for the models elements of shell and solid. The behavior of the slabs was analyzed through the displacements central and approached the influence of the positioning of the reinforcement, the supports and the parameters that define the behavior of the concrete in the softening phase, being distinguished it maximum resistance of the concrete in the tension. The results are indicative of the good performance of the applied numerical models and that, the programs that use the concepts of the Fracture Mechanics in its formularizations, consist in powerful tool to reduce the amount of tests for the study of some specific phenomena, since that if they have resulted trustworthy of the behavior of the employed materials.Item GERENCIAMENTO DE PROJETOS PARA EDIFÍCIOS RESIDENCIAIS DE MÚLTIPLOS PAVIMENTOS: DIRETRIZES APROPRIADAS PARA COOPERATIVAS HABITACIONAIS AUTOGESTIONÁRIAS(Universidade Federal de Goiás, 2009-06-09) BARBOSA, Carlos Alberto de Jesus; FIGUEIREDO, Enio José Pazini; lattes.cnpq.br/4075543806767323Studies carried out by the United Nations (UN) show that a third of the population of the planet is suffering from the lack or inadequacy of dwellings and infra-basic structure. The deficit per dwelling is more serious in underdeveloped countries and developing countries, such as Brazil, and is becoming increasingly difficult to be solved without a great effort of the public, private initiative, financial institutions, education/research and associations on the basis of the various categories of work. As an alternative provision housing, has-if the participative management by mutual assistance, highlighting-if the housing cooperatives of auto-management. This program have presented high performance, where the works housing are being marketed and financed through this modality constructive, reducing the overall cost and increase the quality of the ventures. The mitigation of the overall cost of venture is a preponderant factor of success and survival of housing cooperatives of auto-management. The construction of residential buildings multiple floors enables the ventures housing cooperatives, because the high cost of developed land, usually with areas reduced, requiring increase the number of floors of the product for the better use of sites. The survival and servicing objectives of housing cooperatives of auto-management should consider four fundamental aspects: effectiveness in running (including the projects management), strong partnerships (with highlight to the public power, financial institutions , teaching/research, and other cooperative branches), existence of technical advice (from its constitution) and the target public (associated members with aware and motivated). Several studies identify that is in the projects management of the key to the reduction of waste of inputs and costs, with a gain in productivity and of the quality required to the final product. Considering the gaps in knowledge related to management of the project in the cooperative housing ventures, this study aims to investigate the main factors the quality of the production process, especially the stage of project of residential buildings with multiple floors built by the system of housing cooperatives of auto-management. As a result, the study provides some guidelines and tools for evaluating performance and quality of planning and control of the stage of project, from the studies of models, obtained by two aspects of phenomenological research. With the first vector seeks to at the literature national and international, models and tools for assessing the quality of project management, being more appropriate and would be appropriate for housing cooperatives of auto-management. Through the second vector investigated if, with the study of cases, two ventures of residential buildings multiple floors one in the city of Águas Claras DF, and another in the city of Goiânia GO, administered by housing cooperatives of auto-management. In these evaluated if the organizational structure, systems of an exchange of information, the weaknesses present and critical phases, planning and control the quality of the stage of project, the methodologies and tools of quality, in construction companies, design offices and between the intervening agents of the project process. It is concluded that the application management of the project in housing cooperatives of auto-management is a fundamental factor for survival,in implementing its main goal: to produce low cost housing and quality to their members.Item Influência dos Agregados Graúdos da Região de Goiânia no Módulo de Deformação Tangente Inicial do Concreto(Universidade Federal de Goiás, 2009-11-24) BARBOSA, Isa Lorena Silva; GEYER, André Bortolacci; http://lattes.cnpq.br/0135796530510700This research is carried out to study the influence of aggregate source on the initial tangent modulus of deformation of concrete (Eci), to correlate the resistance to compression (fc) with the module Eci and compare the results of this research with the equations proposed by international standards and the Brazilian. To this end, it was used three levels of resistance to 28 days: 20MPa, 30Mpa and 40Mpa and ranged up the aggregate source in the types lithological micaschist, Granulito and Basalt. Set the type of cement, sand, water, and additive content of mortar. All materials are used in dosages of Goiânia and the surrounding region in order to determine the behavior of these materials in concrete that is produced in the region. The experimental program of this research is divided into two parts. The first is to determine the curves of strength of each aggregate source test of resistance to compression in the age of three, seven and 28 days, while the second part determines the initial tangent modulus of deformation on the ages of seven and 28 days. For the first part of the experimental program were molded 54 body-of-evidence and tested for resistance to compression. For the second part was molded 90 body-of-evidence, where 36 were tested for resistance to compression and 54 with the initial tangent modulus of deformation. With the end of testing was performed a statistical analysis of results obtained through software STATISTIC. In the analysis it was the influence of aggregate source in the initial tangent modulus of deformation (Eci), noting influences the levels of resistance adopted and distinct variations in the influence of aggregate source studied on the Eci, by increasing order of the results of module: micaschist, granulito and basalt. The results also indicated that the NBR 6118 (ABNT, 2003) overestimates the values of modulus of deformation of concrete.Item Investigação da deterioração de concretos de uhes por reações com os agregados(Universidade Federal de Goiás, 2013-10-21) Batista, Danilo Gonçalves; Carasek, Helena; Hasparyk, Nicole Pagan; http://lattes.cnpq.br/4932240949129648; Hasparyk, Nicole Pagan; Romão, Patrìcia de Araújo; Kuperman, Selmo Chapira; Silva, Lzelman Oliveira daA long time ago aggregate particles were considered inert but this concept is no longer adequate. Expansive reactions resulting from the oxidation of sulfide-bearing aggregates and the AAR are examples of potential chemical interactions that aggregates may experience in concrete, depending on the surrounding environment. This research is an investigation into concrete deterioration in Hydroelectric Power Plants (HPPs), focusing on aggregate reactions relating to attack by sulfates, due to oxidation of sulfide minerals, as well as to the alkali-aggregate reaction (AAR). One of the main purposes is to have a clearer understanding of the changes in sulfide minerals occurring in aggregates and verify their influence on concrete durability as well as check the conditions and characteristics that maximize or not the synergy of such pathology. Along with that, another purpose is to study the possibility of the AAR occurring in the same structures. To this end, an investigation of concrete structures extracted from five Brazilian hydroelectric plants, namely Corumbá HPP, Marechal Mascarenhas de Moraes HPP, Paulo Afonso II HPP, Paulo Afonso IV HPP and Moxotó HPP, was conducted. In addition to the concretes, a study of the rocky material and aggregates surrounding the plants that were of the same origin as the aggregates in the concretes was also performed. A thorough visual inspection was made in the field of some concrete structures selected from the HPPs , with the subsequent extraction of concrete cores in spots that were more prone to the incidence of some chemical reaction. The concrete core samples were initially inspected in the laboratory to check for possible visible anomalies on their surfaces, and were subsequently subjected to laboratory tests to determine the mechanical properties such as compressive strength and elasticity modulus. Chemical and microstructural analyses of the concrete were then carried out, in addition to the reconstitution of the mix design and determination of their pH. The concrete were also underwent internal inspections before the microstructural analyses, and the last were scanning electron microscopy with energy-dispersive X-ray spectrometry (EDS) and X-ray diffraction (XRD) in order to diagnose deterioration. Aggregates extracted from concrete cores along with the rocky material of the same origin were also subjected to chemical and mineralogical analyses. The concrete from Corumbá HPP was found to be sound, but in the concretes from the other HPPs it was proved the incidence of AAR and sulfate attack simultaneously, and in some cases, with evidences that the attack by sulfates results from the oxidation of sulfide minerals in the aggregates.Item Influência do tipo e do tempo de duração de cura nas propriedades mecânicas de concretos de alto desempenho (CAD) produzidos em períodos quente (t>25°C) e de baixa umidade relativa do ar (h<50%)(Universidade Federal de Goiás, 2005-06-07) BESERRA, Simone Ataíde; BACARJI, Edgar; http://lattes.cnpq.br/2385473000869120; GEYER, André Bortolacci; http://lattes.cnpq.br/0135796530510700In the case of conventional concrete, small constructive defects, variations of mix proportion or even inadequate curings can not compromise significantly the material. No longer HPC demands a severity in the control since its dosage until the execution, therefore any imperfection can bring serious damages to the material or the structure. Amongst the relative aspects most important to the total quality of any concrete it is the curing, that becomes basic when is about HPC. The curing of the high performance concrete constitutes in a controversial subject in the technician area as well as the type and duration of it, therefore the necessity of a deeper refined study on this subject. This research verifies the influence of the type and time of duration of curing in the mechanical properties of the HPC (compressive strength, flexion tensile strength and module of deformation), produced in Goiânia in hot period (t>25ºC) and of low relative humidity of air (h<50%) situation this considered critical for NBR 14931/2003 and predominant in the months of May the September in this region. In the experimental study were produced HPC of target compressive strength 60, 80 and 100MPa, from the Furnas Mix Proportion Method, using cement CP II-F-32, silica fume, polycarboxylate based superplasticizer, natural sand and crushed stones nº 0 of the granulite. 14 cures of different type and times of duration had been applied: curing with permanence of 1, 3, 7, 14, and 28 days inside of the humid chamber; curing with aspersion of water during 1, 3, 7, 14 and 28 days; chemical curing based on paraffin and chemical curing based on chloride rubber; cure for aspersion of water during 7 days and later sealing of the part with membrane of curing based on chloride rubber and air curing. For concretes of target compressive strength to the 28 days of 60 MPa and 80 MPa, the best type of curing was "saw humid" (curing in humid chamber and curing with aspersion of water) and the best time of duration humid was 7 days. For the one of 100 MPa the best type of curing also was "saw humid", however the duration time was 14 days. According to the chemical curing, some times the results had been even though less than to the one of reference (air curing). Among the two types of used chemical curing, difference in the results of compressive strength was not verified, despite the chemical membrane based on paraffin has an inferior cost to the chloride rubber base.Item Estudo e avaliação de uma proposta de modelagem do comportamento micromecânico do concreto(Universidade Federal de Goiás, 2015-08-19) Borges, Dannilo Carvalho; Pituba, José Júlio de Cerqueira; http://lattes.cnpq.br/6503462610408968; Pituba, José Júlio de Cerqueira; Almeida, Sylvia Regina Mesquita de; Marques , Severino Pereira CavalcantiThis work deals with a proposed numerical modeling of mechanical behavior in brittle heterogeneous materials, such as concrete. For this propose, a two-dimensional meso-scale model is presented. The material is considered as a three-phase material consisting of interface zone, matrix and inclusions – each constituent modeled by an appropriate constitutive model. The Representative Volume Element (RVE) consists of inclusions idealized as circular shapes randomly placed into the RVE. The interface zone is modeled by means of cohesive contact finite elements the inclusions are considered as linear elastic media and matrix region is considered as elastoplastic material. The main goal here is to show that simple constitutive modeling of the microstructure can be employed with a computational homogenization-based approach as an alternative to complex macroscopic constitutive models for the mechanical behavior of the heterogeneous materials using a finite element procedure within a purely kinematical multi-scale framework. A set of numerical examples, involving the microcracking and plasticity processes, is provided in order to illustrate the qualitative performance of the proposed modeling.Item Avaliação da qualidade de concretos produzidos em centrais dosadoras, misturados em caminhão betoneira e de concretos produzidos em centrais misturadoras(Universidade Federal de Goiás, 2009-12-14) BORGES, Michelly Lorena; GEYER, André Bortolacci; http://lattes.cnpq.br/0135796530510700Due to the small number of studies about the process of production of the concrete dosed in central, as regards the type of employed mixture, this inquiry looked to contribute to the assessment of quality of concrete produced in mixing plant and metering plant. The principal objective of the work was checking if the form of mixing of the concrete can affect your characteristics in hardened state (compressive strength), for that, there was compared the quality of the concrete produced in metering plant and mixed in truck mixer in relation to the mixing plant. As the sample was taken a work, where they had installed a metering plant and a mixing plant, which together produced 300.000 m³ of concrete with the same materials. Inside the proposed objective, also were quantified statistically the existent types of concrete in the same truck mixer, using as the parameter the compressive strength of concrete produced in the metering plant. In the end, it was possible to conclude that the mixing plant produce a concrete of better quality with a less standard deviation than the metering plant. Was also observed a significant variability inside the truck mixer, which made the division of the concrete possible in five group, with different resistances'Item Análise experimental da resistência à flexão simples de vigas de aço tipo "I" compostas de perfis laminados dotadas de emendas soldadas(Universidade Federal de Goiás, 2015-02-04) Borges, Rone Sergio Freitas; Gomes, Orlando Ferreira; http://lattes.cnpq.br/3244852416821211; Gomes, Orlando Ferreira; Silva, Wellington Andrade da; Liserre, Andrea Prado Abreu ReisIn Brazil, despite the skilled labor shortage, the use of metal structures in buildings has increased considerably due to factors such as speed of execution, cleaning the construction site, low deadweight compared with reinforced concrete structures, low material waste, etc. For better utilization of equipment and for which continuity of the openings is necessary to use the amendments, which can be welded or screwed. The quality of the amendments must meet the standards required by the design standards, in rolled profiles, according to ABNT NBR 8800:2008 (Steel Structures Design and Composite Structures of Steel and concrete buildings). These profiles have great applicability in large structures and their use is growing in buildings with these characteristics. This paper presents the experimental study of bearing capacity of two beams supported by steel made of rolled profiles section I of type W 250 x 22,3 ASTM A-572, grade 50, rolled parallel flaps with two axes of symmetry, being provided splices using full penetration welds MIG type (Metal Inert Gas). Seven beams were tested with a length of 3000 mm, with a reference beam. In the remaining six beams amendments were made in different positions varying the amount of amendments. This study also provides a comparison between the results obtained in this work and those obtained by Pereira (2014), which used beams with bolted connections using the same provisions of the amendments of this work, but with ASTM A-325 and screw diameter of 19 mm. All models have been requested by simple bending stress at break, according to the analysis of vertical displacement, and torsional displacement relative specific deformations steel. The connections of beams resisted the simple bending tests not being observed no break in welds. The main contribution of this work was to show that, if well executed, welded connections and bolted performed by Pereira (2014), with the specifications described in this paper, can be used as elements of connections in steel beams subjected to bending, as well resisted the requested efforts .Item Vigas compostas de concreto com laje pré-moldada ligada mediante nichos: análise da resistência da interface(Universidade Federal de Goiás, 2012-08-21) Borges, Vanessa Elizabeth dos Santos; Araújo, Daniel de Lima; http://lattes.cnpq.br/8801080897723883; Araújo, Daniel de Lima; Prado, Ademir Aparecido do; Carrazedo, RicardoCurrently, the civil construction industry has presented some changes. This is due to the recent economic growth that Brazil had achieved. These changes increased the employment of precast concrete structures. The front of this, some studies about the precast concrete connections had been developed. This work objective was to study the shear stress transference mechanism, which appears in the beam-slab connection interface – the composite beams. It was tested three different roughness degrees of the slab shear pockets: naturally rough surface, intentionally rough surface and surface with shear-key. For this, push-out tests – double “L” – were carried out and they showed that the employment of surface setting retarder admixture (ARSP) achieves the roughness degree recommended by the NBR 9062 (ABNT, 2006) without significantly reduce the connection strength. Next, with the same model type, the influence of the percentage of steel across the joint above the strength connection was tested. Besides, another model type – three blocks – was carried out with the same aim. Through those tests, It was could ascertained that the increase of the percentage of steel across the joint provides a linear increase of the strength connection, in as much as, the minimum and maximum values were inspected. Furthermore, the double “L” tests allowed the proposition of two expressions to determine the strength shear connection. And, in a third moment, composite beams were carried out, the results indicated, for the roughness degree and percentage of steel across the joint tested, that the beam-slab connection presents a partial interaction degree, even as the connection degree. Ultimately, the similarity between the three different types of tests could be proved with the proposed expressions application in the tests results.Item Aplicação do polinômio de Hermite-Caos para a determinação da carga de instabilidade paramétrica de cascas cilíndricas com incerteza nos parâmetros físicos e geométricos(Universidade Federal de Goiás, 2014-04-04) Brazão, A. F.; Silva, Frederico Martins Alves da; http://lattes.cnpq.br/9929132527197884; Silva, Frederico Martins Alves da; Del Prado, Z. J. G. N.; Soares, Renata M.; Silveira, Ricardo A. M.The present study aims to investigate the influence of uncertainties in physical and geometric parameters to obtain the load parametric instability of cylindrical shell, using the Galerkin method with the stochastic polynomial Hermite-Caos. The nonlinear equations of motion of the cylindrical shell are deduced from their functional power considering the strain field proposed by Donnell´s nonlinear shallow shell theory. The uncertainties are considered as random parameters with probability density function known in the partial differential equation of motion of the cylindrical shell, which it becomes a stochastic partial differential equation due to the presence of randomness. First, the discretization of the stochastic problem is performed using the stochastic Galerkin method together with polynomial Hermite-Chaos, to transform the stochastic partial differential equation into a set of equivalent deterministic partial differential equations, which take into account the randomness of the system. Then, the discretization of the lateral field displacement is made by a perturbation procedure, indicating the nonlinear vibration modes which couple to the linear vibration mode. The set of partial differential equations is transformed into a deterministic system of equations deterministic ordinary second order in time. Uncertainty is considered in one of its parameters: the Young modulus, thickness and amplitude of initial geometric imperfection. Then we analyze the influence of randomness in two parameters simultaneously: the thickness and the Young modulus. Once obtained the system of ordinary differential equations deterministic containing the randomness of the parameters, the integration over discrete time system is made from the Runge- Kutta fourth order to obtain results as the time response, bifurcation diagrams and boundaries of instability which are compared with deterministic analysis, indicating that polynomial Hermite-Chaos is a good numerical tool for predicting the load parametric instability without the need to perform a process of sampling.Item Influência da areia artificial oriunda da britagem de rocha granito-gnaisse nas propriedades do concreto convencional no estado fresco e endurecido(Universidade Federal de Goiás, 2007-10-31) CABRAL, Keillon Oliveira; FIGUEIREDO, Enio José Pazini; lattes.cnpq.br/4075543806767323The dissertation is aimed at the study being presented theoretical and experimental verification of the performance of artificial sand come from crushing the rock of granite-gneiss in relation to natural sand. Currently, the sand has artificially low commercial value of the market and is considered a "some kind of piece of marginal material ", whose purpose is not defined and remained stored in the courtyards of the quarries, forming huge piles that cause various environmental impacts. In addition to this, the traditionalism and the lack of information has led to an unwarranted mystification of this material. The methodology used for the tests of the research was based on standardized tests, which attempt to meet the objectives of the dissertation, in addition to enhancing the development of techniques to search for alternative aggregates. This has examined the influence of artificial sand in place of natural sand, with different proportions, and focuses on quality of the concrete in plastic and hardened its phases, taking into account the mechanical, elastic, physicalchemical, environmental and economic. The work was to characterize the material that composed the concrete studied. After this phase, were up corpses-of-proof concrete, using 15 (fifteen) different traits, so that the natural sand was gradually replaced by artificial sand, in proportions of 25%, 50%, 75%, and 100%. For each trait was quantified its rebate, density, air incorporation, resistance to axial compression, traction, deformation module, absorption by immersion, alkali-aggregate reaction and an economic evaluation. It is considered that the main objective of this research has been fully achieved, because it was proven the theoretical feasibility of replacing part or even all, of natural sand by artificial sand in conventional