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    Metodologia de inspeção em estruturas de pontes de concreto armado
    (Universidade Federal de Goiás, 2011-11-25) Euqueres, Priscilla; Rêgo, João Henrique da Silva; http://lattes.cnpq.br/6282100880834079; Figueiredo, Enio José Pazini; http://lattes.cnpq.br/4075543806767323; Figueiredo , Enio José Pazini; Rêgo, João Henrique da Silva; Liserre, Andrea Prado Abreu Reis; Carvalho, Alessandra Luciano
    The objective this work is to develop and implement a methodology for special inspection on Concrete Bridges trough the quantitative analysis of the degree of deterioration of the structures so that it can serve as a basis for making decisions related to the rehabilitation of these structures. In order to develop and apply the methodology on concrete bridges, the existing methods of inspection of concrete structures were studied and adapted to the adapting to the concrete bridges. The methodology was based on GDE/UnB model in their latest formulation (Fonseca,2007) and adapted to the tables with the elements to be analyzed, together with the pathological manifestations that can occur in each element, timing and interventions classification of the level of deterioration and the relevant factors to each family of concrete bridges. A pilot study was proposed to validate the methodology. Results showed that there was a need for further adaptation, to consider the caculations of the degree of deterioration of both the family or the. With the changes proposed in the pilot study were made over 11 (eleven) inspections in order to validate the proposed methodology. With the results obtained it was concluded that the methodology for inspection of bridges is valid and of great importance to public organisms and surveyors to make decisions about the best time and the best item to be rehabilitated, being a single element, as a family elements, or the structure as a whole. One downside is that the methodoly for bridges with lenght greater than 70 meters most be used with caution, because the median openings are difficult to visual assessment. However the methodology can be used in order to obtain basic understanding of the visible elements, and after the intervention, we can make another more detailed analysis using not only the elements of routine inspection as binoculars, measuring tape, camera, among others, but also nautical elements, which provide the best viewing responsible for the inspection of the median elements
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    Análise numérica da cravação estática de estacas metálicas tubulares de ponta aberta
    (Universidade Federal de Goiás, 2018-06-29) Ferreira, Jaqueline Rodrigues; Vargas, Carlos Alberto Lauro; http://lattes.cnpq.br/3816106720170772; Sales, Maurício Martines; http://lattes.cnpq.br/2033708685029423; Sales, Maurício Martines; Cavalcante, André Luís Brasil; Gitirana Junior, Gilson de Farias Neves
    The use of steel pipe piles as a foundation element brings a new focus to the contributions of soil plug to the behavior of open-ended pipe piles. Therefore, considering the necessity to understand the plug formation, its influence on pipe pile load capacity and the limited of research developed in real scale models, this work aims to numerically simulate the process jacking open ended steel pipe piles in sands, seeking to investigate the soil properties and piles geometry interference on the jacking process. For the development of these simulations an explicit finite difference program, FLAC (Fast Lagrangian Analysis of Continua), was used. The methodology developed started with the finite difference mesh, jacking velocity and interface parameters (normal and shear modulus) calibration. This process was validated with calibration chamber tests results developed in other researches. Henceforth, parametric analysis involving the pipe geometry – internal diameter, wall thickness and tip angle – and the soil mechanical parameters – friction angle, density and elastic modulus – were conducted. As result, among all the factors analyzed, soil density and pile tip angle do not interfere in soil plug formation. Furthermore, the program selected for the simulations was able to model plugging, exhibiting similar behavior to calibration chamber tests results.
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    Modelos preditivos de dano aplicados a estruturas de concreto atacadas por reação álcali-sílica: uma revisão sistemática da literatura
    (Universidade Federal de Goiás, 2017-05-19) Gomes, Geovanne Caetano; Carasek, Helena; http://lattes.cnpq.br/3023241186996790; Carasek, Helena; Cascudo , Oswaldo; Guimarães, Marlos José Ribeiro
    Among the several deleterious actions may attack concrete elements, is the alkali-aggregate reaction (AAR), which affects, mainly, structures of dams, bridges and foundations, where the alkali-silica reaction (ASR) is the most common. One of the main challenges regarding the prediction of this phenomenon is the development of models that may predict damage specific for this reaction, which constitute the theme of this research. Firstly, a systematic literature review was conducted with respect to the models developed, with the organization and classification of the data found, presenting a clear and detailed state-of-art. Therefore, the studies published in journals in the last five years (2012-2016) were selected, in order to conduct their categorization regarding the scale and nature of the analysis, type of modeling, and the software necessary to execute the simulations, besides the summarizing, grouping and analysis of the information concerning the input data necessary to the execution of each modeling, as well as the results generated by each one of them. The models which do not predict damage, i.e. general models that simulate the ASR, were investigated to verify their contribution to a better understanding of the chemical and physical processes that occur in the concrete affect by the reaction. Finally, it was verified that the models analyzed are based on different theories and methods of analyses, demanding distinct input data and generating heterogeneous output data, which are meticulously explained in this paper.
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    Transferência dos esforços cisalhantes em juntas de pavimentos rígidos
    (Universidade Federal de Goiás, 2008-09-17) Oliveira , Elisandra Miranda de; Guimarães , Gilson Natal; http://lattes.cnpq.br/0060821461126304; Guimarães , Gilson Natal; Geyer , André Luiz Bottolacci; Tavares, Maria Elizabeth da Nóbrega
    The joint is part of the constructive process of the rigid pavement. In its implementation the section of concrete located below it is weakened and eventually becoming the most vulnerable of the pavement can arise where the possible diseases that may affect their strength and durability. Despite the importance that the joint has in the life of the rigid pavement it is not exploited, and therefore became the main subject of this study. This work is an experimental study of the sawed joint in rigid pavement of concrete with evaluation of the transference of shear strength through the saweds joints. The experimental program consisted of test of fourteen simple concrete plates with sawed joint, and adoption of the following variable: presence of smooth dowel of Ø 12,5mm, variation of the length of dowel (500 mm, 400 mm and 300 mm), variation of the thickness of the plates (120 mm and 160 mm), variation of the strength to the compression of the concrete (20 MPa and 30 MPa) and of the type of used concrete (conventional and autoadensável). These plates had been supported on natural and assayed rubber layers with static shipment application in one of the sides of the together one until the rupture of the plate. The results had shown that: the use of dowel in these meetings increases the efficiency in the transference of efforts; the increase in the thickness of the plate increases the resistant capacity of the together one, the efficiency in the transference of efforts and possesss minors displacements of the plate during the application of the shipment; the dowel with reduced size are efficient, but the bars of 400 mm present resulted next to the one to the bar in commercial size, 500 mm; the plates in autoadensável concrete after the fissuration practically do not present contribution of the concrete in the transference of efforts for the intertravamento of aggregates; the sawed joint depth of the together one has influence in the way of rupture of the plate and tack relation enters the bar of transference and concret.
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    Vibrações não lineares em tubulações com fluido em escoamento
    (Universidade Federal de Goiás, 2013-06-21) Prado, Joaquim Orlando; Prado, Zenón José Guzmán Núñez del; http://lattes.cnpq.br/7703344458057759; Prado, Zenón José Guszmán Núñez del; Silva, Frederico Martins Alves da; Brito, José Luís Vital de
    In this work, the linear and nonlinear instability of pipes conveying static and pulsating fluid flow is analyzed. The dynamic equation of motion was derived for cantilevered and clamped-clamped pipes. For this purpose, the Euler Bernoulli beam theory and Hamilton’s principle were applied, resulting in a partial differential equation of second order in time. Thus, a model with four degrees of freedom, which satisfies the boundary condition, is used and, the Galekin method is applied to derive the set of coupled non linear ordinary equations of motion which are, in turn, solved by the fourth order Runge-Kutta method, and then some numerical results were obtained as Argand diagram, stability boudaries, time response, phase plane and, Poincaré section, through computational algorithms modeled in C++. These results revealed the importance of the nonlinear terms in the stability of the system, especially in the post-critical analysis, also revealed the existence of quasi-periodic motions, for the system subjected to a static flow and, chaotic motions for pulsating fluid flow
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    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, Ricardo
    Currently, 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.
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    Otimização de topologia aplicada ao projeto conceitual de edifícios usando o método da estrutura base
    (Universidade Federal de Goiás, 2016-01-19) Silva, Sara Brandão e; Almeida, Sylvia Regina Mesquita de; http://lattes.cnpq.br/1855764480221018; Almeida, Sylvia Regina Mesquita de; Prado, Zenón José Guzmán Nuñes Del; Evangelista Júnior, Francisco
    Topology optimization provides design solutions to several engineering applications and density methods are the most popular approach in this field. However, when it comes to building design, the dimension of the extended domain related to the high of the building provides material concentration at the basis of the building. On the other side, the ground structure method provides desirable grid solutions using a highly connected truss in an approach close to size optimization techniques. This work presents a prospective study about the application of ground structure method to obtain bracing systems for buildings comparing with the known solutions obtained by density methods. Desirable manufacturing constraints such as patterns repetition and symmetry are considered. Multiple loading functions are Simulations are developed in two-dimensional building configurations to validate the method and show the structural comportment. Three dimensional examples are developed to show possibility of interesting solutions obtained with the ground structure method.
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    Contribuição para diagnóstico e durabilidade de algumas edificações em estruturas de aço da cidade de Goiânia
    (Universidade Federal de Goiás, 2015-11-26) Lima, Marcello Alencar; Gomes, Orlando Ferreira; http://lattes.cnpq.br/3244852416821211; Gomes, Orlando Ferreira; Geyer, André Luiz Bortolacci; Carrijo, Elias Calixto
    Recently have been noticed a few buildings made of steel structures in the city of Goiania, have shown process and progressive corrosion in your structural systems, and partly, for example, trusses, beams, columns etc. Such succession was visually perceived due to the aggressiveness of conditions relating primarily to the internal microenvironment of buildings, rain and animal feces. The methodology that was used is the data collection in the field of measuring thickness of the paint protection of apparent metal structures and photographic record of the problems of works, such as pathological manifestations of steel, paint, water accumulation sites etc. With the obtained data, the spreadsheet will be filled, depending on the model suggested by Mortari, 2008. In completing the Check list, it is easier to diagnose the structure, mainly because the diagnosis is last.
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    Influência da idade e cura do concreto na resistividade elétrica
    (Universidade Federal de Goiás, 2015-12-02) Perez, Elva Wendolyn Ramirez; Figueiredo, Enio José Pazini; http://lattes.cnpq.br/4075543806767323; Figueiredo, Enio José Pazini; Oliveira, Janes Cleiton Alves de; Silva, Izelman Oliveira da
    The surface electrical resistivity of the fresh and hardened concrete states can be influenced by factors such as degree of hydration, the water / binder ratio (w / b), aggregate content and existence of armour. This study objective is to evaluate the performance and behavior of the electrical resistivity of the concrete´s surface based on the influence of hidratation process, curing time and the w/b ratio. The actual measured were divided into three groups, where C-0,81 represents the specific group with w/b ratio= 0.81 and compressive strength =20 MPa; C-0,50 is the concrete with w/b ratio= 0.50 and 40 MPa; and C-0,35 represents the concrete with the ratio of 0.35 and compressive strength of 60 MPa. The curing procedures applied to the three groups were: dry cure, cure submerged up to seven days and cure submerged up to fourteen days. This study the results showed that in the higher ratio w/b , the porosity of the sample is greater, and this increases the electrical resistivity. Regarding the dry cured concrete, it had higher resistivity vs submerged conrete. The results also showed that greater the degree hydratation in the sample the greater the resistivity.
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    Planejamento e controle de cronograma físico de obras por mei oda corrente crítica no Ms Project
    (Universidade Federal de Goiás, 2015-08-27) Resende, Vitor Hugo Martins e; Amaral, Tatiana Gondim do; http://lattes.cnpq.br/7298757233386815; Amaral , Tatiana Gondim do; Brandstetter, Maria Carolina Gomes de Oliveira; Machado, Ricardo Luiz
    We noticed that even with the diversity of computational tools, along with the management, a lack of efficiency in meeting project deadlines in construction work. Several studies indicate failures in project management, highlighting the existence of problems related to planning and control of construction works, as the most recurring. The critical chain is an application of the theory of constraints in project management that aims to meet the deadlines, through the lungs management of consumption. In this context, the present study evaluates the implementation of the critical chain methodology in a physical planning using Ms Project as management software, in a construction work company. The methodology used was a case study and was conducted in two projects, located in the cities of Guapó and Palmeiras de Goiás, in the State of Goiás. According to the study, as the application in construction work, the results show that the Critical Chain Project Management (CCPM) can be applied in compliance with all steps recommended by the theory. Regarding the fulfillment of the project’s deadline, the study showed that in companies with emphasized problems in planning and financing, delays continue. In the financial aspect, we noticed that the delay in transferring funds by the funding agency, attached to the Federal Government, to the company impacted directly on planning the purchase of materials, equipment and workforce. The methodology of critical current proved to be applicable to the construction work sector and the Ms Project software, but with limitations. Among the limits, it is worth mentioning the use in very extensive schedules and the carrying out of steps without the aid of automatic functions or the method known as "manual", in Ms Project. As a solution to this limitation, the study presents the use of Ms Project on critical chain using automatic routines (macros). As a result, while using the "manual" it was noticed a significantly higher period of time, compared with the automatic, in addition to the possibility of errors in data entry and reworking. In automatic method, the time is reduced and errors and reworking are eliminated. Both in the "manual" method, as the automatic method, the steps of creating convergence lungs and the late start of the tasks are not feasible for long schedules, which are characteristic of real estate undertakings of social interest.
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    Avaliação de trechos de pavimentos experimentais construídos com materiais alternativos na região metropolitana de Goiânia
    (Universidade Federal de Goiás, 2012-08-27) Marques, Michelle de Oliveira; Rezende, Lilian Ribeiro de; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4768291J2; Rezende, Lilian Ribeiro de; Gitirana Júnior, Gilson de Farias Neves; Trichês, Glicério
    In the Federal University of Goias (UFG) some researches have been developed focus on the importance of the alternative materials study for urban paving in substitution to the traditional materials used in the area, as the lateritic gravel. These studies contemplated the construction of experimental road pavements divided in sections in function of the materials composition used for the subbase and base layers execution, aiming the evaluation of the pavement performance when submitted to the real traffic in roads with low to medium traffic volume. Since 2004, three experimental roads were built, being two in the city of Goiania-GO and one in Aparecida of Goiania-GO. The no conventional and environmental correct materials used in those works were: civil construction waste, quarry waste, phosphogypsum and mixtures of fine soil found at the place of the work with crushed rock or lime. As the periodic monitoring is of great importance for the constant evaluation of the behavior of those pavements, this research had as objective monitors the existent roads in the year of 2011 and to compare the results obtained with the one of the previous studies. For so much, several field tests were done in two different periods: one of dry and other rainy. The field tests were executed with the following equipments: Benkelman beam, plate bearing, Dynamic Cone Penetrometer (DCP) and PenetrometreAutonomeNumeriqueDynamique equal AssistéOrdinatur (PANDA), so much with the cone of 2 cm2 as with the one of 4 cm². Besides, samples of the structural layers of the pavements and subgrades were collected for water content verification in the two periods of tests. At the end of each test the comparison of the roads performance was done along the time from the construction period. In general, it is observed that all the alternative materials used in the experimental pavements have been presenting similar behavior to the lateritic gravel, showing application viability.
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    Monitoramento de uma estrutura de contenção em estacas espaçadas considerando perfil de sucção
    (Universidade Federal de Goiás, 2015-08-14) Gomes, Adriana Cristina; Vargas, Carlos Alberto Lauro; http://lattes.cnpq.br/3816106720170772; Gitirana Júnior, Gilson de Farias Neves; http://lattes.cnpq.br/4710728908810849; Gitirana Júnior, Gilson de Farias Neves; Sales , Maurício Martines; Costa, Yuri Daniel Jatobá
    This study presents the results of an extensive field monitoring program in which the lateral displacements of a nail reinforced sheet pile wall in Goiânia, Brazil were measured during the excavation process. The instrumentation methods adopted were multiple point borehole extensometers (MPBX) and optical surveying. The MPBX showed good results that could be appropriately interpreted as the excavation progressed. However, the measurements of optical surveying were not reliable due the low precision of total station and for being highly affected by user’s errors. In order to determine the geotechnical profile, laboratory test were undertaken to obtain strength and deformation parameters for unsaturated and saturated soil conditions. The large variability of the soil, observed in terms of void ratio, presented an important obstacle, making the determination of representative shear strength parameters a challenge. As a way to bridge the analysis of field monitoring results, soil properties and the numerical back analyses of the retaining walls, the water content profile and the soil-water characteristic curve were measured. Such data was used to obtain the suction profile and evaluated its influence in the monitored field data. Finally, the numerical code Sheeting Check (Geo5), which uses the beam on elastic foundation method, was employed to obtain the soil subgrade reaction modulus (ks) and determine the retaining wall deformation profile and earth pressures in saturated and unsaturated soil condition. The maximum lateral displacements values found in the numerical back analyses were compatible with the monitoring results. Besides, the influence of unsaturated soil conditions and soil suction in the reduction of the retaining wall deformations and the active earth pressures were observed.
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    Análise experimental de pilares de concreto armado, com carga excêntrica, reforçados com chumbadores e concreto autoadensável (CAA)
    (Universidade Federal de Goiás, 2015-10-16) Virgens, Jeovan Pereira das; Trautwein , Leandro Mouta; http://lattes.cnpq.br/8892009084347857; Gomes, Ronaldo Barros; http://lattes.cnpq.br/6046088082653028; Gomes, Ronaldo Barros; Trautwein, Leandro Mouta; Guimarães, Gilson Natal; Vaz, Ana Paula Rodrigues
    This paper presents the experimental study of reinforcement concrete columns reinforced with wedge bolts and a 35 mm self compacting concrete jacket at the most compressed face. Nine columns with a 2000 mm height subjected to flexure and bending with initial eccentricity of 60 mm, named as: original column (Po) with a cross section of 120 mm x 250 mm; reference column (Pref) with a cross section of 155 mm x 250 mm and seven columns with a initial cross section of 120 mm x 250 mm, and later reinforced by the addition of 35 mm reinforcing layer, and various configurations of wedge bolts at its most compressed face. Except for the original column (Po), the columns were submitted to a 42.5 mm load eccentricity due to the attached concrete layer at the compressed face. Although failure of the wedge bolts did not accour, it was not possible to prevent detachment of the reinforcing layer. The results indicate that it is possible to structural rehabilitate reinforce concrete columns with the use of the strengthening methodology used in this research, resulting in average load capacity gains of 3,71 times compared to original column load (Po).
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    Análise experimental de pilares de concreto armado submetidos à flexo-compressão, reforçados com concreto auto-adensável e conectores metálicos
    (Universidade Federal de Goiás, 2015-11-27) Rocha, Anderson Souza; Delalibera, Rodrigo Gustavo; http://lattes.cnpq.br/6277549281444797; Delalibera, Rodrigo Gustavo; Silva, Wellington Andrade da; Souza Júnior, Dogmar Antônio de
    The proposed research is based on the study of reinforcement columms in reinforced concrete, with the use of anchor bolts and fill with self-compacting concrete, by jacketing. In addition to the experimental studies, numerical simulation was performed using a computer program based on the finite element method, took into account the breaking loads, displacements and deformations which allows a careful study of reinforced columms. The experimental part of this work was based on the test five columms of reinforced concrete, submitted to straight flexion-compression, in order to assess the bond interface between the concrete substrate and reinforcement of concrete and confirm the efficiency of this technique commonly used for reinforcement. Two columms were used as reference, one with the original abutment dimensions (Reference Columm, cross section: 120 x 250 mm) and the other monolithic concreted with the section of enhanced piece (Monolithic Columm, cross section: 155 x 250 mm). The others received a layer of 35 mm thick concrete in the compressed self-compacting face. The preparation of the interface between the two materials, it will be carried with the scarification boreholes along this surface, which anchors were inserted responsible for reinforcement of concrete bond with the substrate. It can be concluded on the work developed that not only the quantity but especially the location of the connectors used for the connection between the two materials, are essential for a good result of resistance and failure mode. Despite the studs do not present break, there was the peeling of the reinforcement layer. The results obtained indicate the possibility of using this method in the structural reinforcement columms rehabilitation, as it showed an increase in bearing capacity of about four times compared to the column of reference. The results of numerical simulation were very satisfactory, because the behavior of the columms in relation to tensile strength, displacements and deformations, approached the experimental results, with minor differences.
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    A influência da ligação pilar-bloco nos mecanismos de ruptura de blocos de fundação sobre duas estacas
    (Universidade Federal de Goiás, 2015-11-27) Mesquita, Adelson Cândido; Delalibera, Rodrigo Gustavo; http://lattes.cnpq.br/6277549281444797; Delalibera, Rodrigo Gustavo; Silva, Wellington Andrade da; Oliveira, Marcos Honorato de
    The proposed dissertation aimed to experimental studies and computational modeling of the behavior of two pile caps, with sockets embedded, subjected to the center load. Models varying the type of conformation of the column and walls of the cup were adopted. This variable was chosen because it was found that for glasses partially embedded blocks with the choice of smooth or rough wall changes significantly the distribution of the flows of compressive stress and tensile thus modifying the strut and tie model using in the design. Thus, through the investigation of this variable, we analyzed the influence of the conformation of the walls connecting the structural behavior of the pile cap. Features such as diameters of piles, pillar dimensions, geometry of the blocks and reinforcement ratio were not considered variables, so that there were no differences in the formation of fields and stress paths. The experimental part of this dissertation was based on the characterization of the materials that make up the parts (concrete and steel), and the construction and testing three two pile caps, one reference (monolith), with rough and connection with smooth connection. Through trials, it was found that the obtained pile cap with rough connection performance equal to 66% of the monolithic pile cap, while pile cap binding obtained with smooth performance of only 36%. In the numerical step, numerical simulations were performed using the ANSYS ® (SYStem Analyser - ANSYS, INC, version 14.0) program, based on the Finite Element Method (FEM). Considered behavior no-linearity of concrete and steel, and the influence of reinforcement in structural behavior of the pile caps. Will also checked the variation of the experimental and theoretical results with the lattice model used in design, beyond the strut and tie model.The proposed dissertation aimed to experimental studies and computational modeling of the behavior of two pile caps, with sockets embedded, subjected to the center load. Models varying the type of conformation of the column and walls of the cup were adopted. This variable was chosen because it was found that for glasses partially embedded blocks with the choice of smooth or rough wall changes significantly the distribution of the flows of compressive stress and tensile thus modifying the strut and tie model using in the design. Thus, through the investigation of this variable, we analyzed the influence of the conformation of the walls connecting the structural behavior of the pile cap. Features such as diameters of piles, pillar dimensions, geometry of the blocks and reinforcement ratio were not considered variables, so that there were no differences in the formation of fields and stress paths. The experimental part of this dissertation was based on the characterization of the materials that make up the parts (concrete and steel), and the construction and testing three two pile caps, one reference (monolith), with rough and connection with smooth connection. Through trials, it was found that the obtained pile cap with rough connection performance equal to 66% of the monolithic pile cap, while pile cap binding obtained with smooth performance of only 36%. In the numerical step, numerical simulations were performed using the ANSYS ® (SYStem Analyser - ANSYS, INC, version 14.0) program, based on the Finite Element Method (FEM). Considered behavior no-linearity of concrete and steel, and the influence of reinforcement in structural behavior of the pile caps. Will also checked the variation of the experimental and theoretical results with the lattice model used in design, beyond the strut and tie model.
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    Estudo laboratorial de bases granulares recicladas in situ
    (Universidade Federal de Goiás, 2015-03-24) Silva Junior, Valdemar Martins da; Angelim, Renato Resende; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4706318U6; Rezende, Lilian Ribeiro de; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4768291J2; Rezende, Lilian Ribeiro; Mascarenha, Márcia Maria dos Anjos; Oliveira, João Carlos de
    The full depth reclamation technique of pavements consists in the reuse of granular materials of existing layers as well as the granular and bituminous materials that compose the deteriorated asphalt layer may also add aggregates or chemical stabilizers, giving rise to a new base that will receive a new asphalt layer. Besides eliminating the need of spoil area of material from asphalt layer deteriorated, this technique gives greater agility to the site and a reduction in costs. This research was motivated by the agreement between the university (Universidade Federal de Goiás) and the government inspection agency (Controladoria Geral do Estado de Goiás – CGE-GO) and its main objective to evaluate laboratory if the solutions specified in the project are technically suitable for the pavements offer a satisfactory performance. The research has the specific objectives: to determine if the amount of gravel added to recycling is the amount specified in the project and, if indeed, this percentage is the one submitting the best mechanical results and check whether there was or not the breaking of aggregates during the compaction. Initially, a deformed sample of recycling material of four roads were collected in the field and from the accomplishment of conventional laboratory tests (characterization, compaction, expansion and California Bearing Ratio) and dynamic triaxial tests their characteristics and properties were determined and analyzed. Furthermore, a dosage study related to the amount of gravel added to the mixture was also carried out to check which content would provide a better performance to the pavement. The stress analysis was performed using the computer program Sigma / W and from the stresses acting in the bases of the roads was obtained the resilient modulus values of each base material used in the reconstructions and the results were compared with values obtained in existing similar studies. Among the base materials used in the reconstructions of the four roads studied, three showed resilient modulus in the laboratory higher to 400 MPa. From the analysis of the results, it appears that the recycled base with the addition of gravel has potential of application in the region of study. However, to be successful in the practice and the best relation for money, it is important to make a preliminary study of dosage, set the adequate compaction power, perform executive control on the site and evaluate the technical basis of specifications which they consider mechanistic parameters, still little existing in Brazil.
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    Metodologia híbrida aplicada em uma ferramenta numérica para análise de radier estaqueado
    (Universidade Federal de Goiás, 2015-09-30) Carvalho, Sofia Leão; Sales, Maurício Martines; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4786138U4; Sales, Maurício Martines; Almeida, Sylvia Regina Mesquita de; Mota, Neusa Maria Bezerra
    The combination of two different types of foundation has become increasingly popular among engineers in the past few decades as a good alternative for large loads due to the trending expansion of taller skyscrapers. This new concept in foundation engineering, called piled raft, combines the raft capacity of withstanding large loads to the reduced settlement provided by a group of piles strategically placed. This new concept of foundation design has stimulated the use of new methodologies that look for understanding the interaction between its elements (raft, piles and soil), the settlement and the distribution of load between them. Over the past decades, the development of faster and more powerful computers has allowed engineers to use numerical methods in the analysis of this type of problem assisted by new software tools. Among all possible numerical methods, the Finite Element Method (FEM) has stood up for being precise and very adaptable to many situations. Despite its extensive applicability, the FEM method has its limitations regarding the processing time and capacity of computers mainly when the third dimension of the foundation is considered. For the fore mentioned reason, hybrid tools have been developed combining FEM to other methods aiming faster analysis and better quality results. In this context, this thesis presents a new tool, called Soil-Foundation Interaction Analysis, SoFIA. The code was developed in object-oriented programming with Approximate Computer Methods. The raft in SoFIA is modelled as two-dimensional finite plate elements, and the group soil/piles ins modelled as an elastic base. Each stage of the tool development and a set of application models are described on this report based on literature review. This work aimed creating a self-sufficient tool capable of analyzing a piled raft model with all the interaction analysis. Furthermore, the program SoFIA was modelled using object-oriented programming, anticipating future expansions, such as different finite elements, non-linear response and other types of foundation. Example results showed good agreement when compared to literature regarding settlement, share of load between raft and piles and moments in x and y directions. Moreover, the axisymmetric interaction analysis between elements of piles and soil indicated similar settlement when compared to complete tridimensional analysis and Boundary Element Method.
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    Estudo laboratorial de misturas asfálticas a quente utilizadas em Goiás
    (Universidade Federal de Goiás, 2015-08-28) Prudente, Carolina Queiroz Arantes; Bernucci, Liedi Legi Bariani; http://buscatextual.cnpq.br/buscatextual/busca.do; Rezende, Lilian Ribeiro de; http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4768291J2; Rezende, Lilian Ribeiro; Mascarenha, Márcia Maria dos Anjos; Angelim, Renato Resende
    Flexible or asphalt pavements compose the Brazilian highway network, which have to promote security on traffic on the highways, to support the effects of changes in climate and to resist the traffic of vehicles. By this reasons, the structure of the pavement is particularly important and must be constituted by layers, which can distribute the loads into the structure, reducing the vertical load produced by the action of traffic and, consequently, providing protection to the subgrade. In the middle western Brazil, in the state of Goiás, there is not advanced studies on asphalt mixtures used in highways and in urban pavements, and there is not a technical scientific proofing that the local aggregates available in the region, is the best option considering the local conditions. Forward better conditions of infrastructure, it is proposed to develop more efficient asphalt mixtures for pavements, by submitting the mixtures through analysis of mechanical strength and performance test, analyzing if the most used asphalts mixtures are satisfactory or not. The hot asphalt mixture are composed by aggregates and asphalt binders that are design in order to attend the parameters set in the projects according to demand and traffic types. In this research, it was proposed the study of six asphalt mixture design with different types of asphalt binders with the same aggregates origin in a different grain size range (Bands B and C). The binders used in this study are the conventional cement asphalt in the region, CAP 30/45 e 50/70 (Brazilian penetration grade), with low and medium penetration, respectively, and the polymer modified asphalt (AMP). The CAP 50/70 is the most used conventional binder in the region, followed by CAP 30/45. Tha AMP binder is not often used. The characterization tests of the materials that composed the mixture are presented and their selection and characterization attended the standardized procedures and requirements by the brazilian department responsible for highway structures (DNIT). In a second stage, the design tests were performed, combining aggregates and binders in different rates, by the Marshall Mix Design Method using manual compression, until the great design was obtained The laboratory tests were realized with this great design to analyze the mass loss and obtain its mechanical properties, given by the tensile strength (RT). Performance tests were realized to obtain its resilient modulus (MR) and, using wheel tracking test, to obtain the permanent deformation (DP). The results showed that the common hot mixture asphalt used in the region (range C and CAP 50/70), is not a good option, because its performance is not satisfactory. Therefore, the range to be used, and the binder, must be analyzed for each traffic level. It is also recommended to evaluate the Marshall methodology for design mixtures, considering mainly the compression way and the determination of the maximum densities.
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    Efeitos da temperatura do concreto fresco na sua trabalhabilidade
    (Universidade Federal de Goiás, 2015-06-12) Campos Neto, Tiago Ferreira; Geyer, André Luiz Bortolacci; http://lattes.cnpq.br/0135796530510700; Geyer, André Luiz Bortolacci; Bacarji, Edgar; Liserre, Andréa Prado Abreu Reis
    The rheological properties...
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    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 Cavalcanti
    This 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.