Flat Slabs
Mostrando 13-24 de 27 artigos, teses e dissertações.
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13. Análise crítica dos critérios normativos de dimensionamento à punção em lajes lisas
The Brazilian code NBR 6118/2003 introduces significant changes in the criteria for the punching shear strength of reinforced and prestressed concrete flat slabs. In this scenario, the objective of this work is to evaluate these punching shear design procedures in terms of safety, precision and economy with respect to test results of reinforced and prestress
Publicado em: 2008
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14. Avaliação in loco das perdas de protensão de cordoalhas engraxadas em lajes planas
This dissertation presents the results of in situ measurements of stress losses in unbonded tendons of post tensioned flat slabs. These flats slabs have approximately 350 m2 in area and are 17 centimeter thick. They are part of a 17 story high hotel building in Belo Horizonte. Load cells were employed to measure the forces in the tendons; they were placed in
Publicado em: 2008
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15. Punção em lajes cogumelo de concreto protendido com cabos não-aderentes na ligação laje-pilar de borda / Punção em lajes cogumelo de concreto protendido com cabos não-aderentes na ligação laje-pilar de borda / Punching shear in prestressed concrete flat slabs with slabedge column connections / Punching shear in prestressed concrete flat slabs with slabedge column connections
São investigados o comportamento estrutural e a resistência última à punção de ligações lajepilar de borda, em edifícios em lajes cogumelo de concreto protendido com cabos nãoaderentes, tendo como principal variável a excentricidade da força cortante, dada pela variação da relação M(momento transferido ao pilar) / V(força cortante). Foram en
Publicado em: 2008
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16. Experimental nervuradas smooth flagstone analysis of reinforcement concrete with shear armor / Análise experimental de lajes lisas nervuradas de concreto armado com armadura de cisalhamento
Two-way waffle flat slabs are structural elements of reinforced concrete supported directly on columns, under bending moments over the two directions, they improve the speed of the execution and save moulds and concrete and, consequently, labor. This work seeks to contribute for the study of the behavior of this kind of slab, as the shear resistance of the r
Publicado em: 2007
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17. Estabilidade em edifícios de concreto armado com pavimentos em lajes planas.
This present work covers possible manners of evaluating steel concrete frames designed for multiple flooring buildings as far as instability and necessity of second order efforts are concerned. Starting from single floor projects with simple flat slab frame, models with different numbers of floors are considered. The models do not use large rigidity elements
Publicado em: 2007
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18. Punção em lajes cogumelo : estudo da retangularidade dos pilares
Eight reinforced concrete square flat slabs of reinforced concrete were tested. Slabs were 130mm thick with an 1800 mm side and were submitted to central loading, and the objective was to investigate the influence of column rectangularity coefficient. Column cross section dimensions (cmáx/cmín) varyied between 1 and 4, with a constant perimeter equal to 10
Publicado em: 2006
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19. Análise experimental de lajes lisas unidirecionais de concreto armado de alta resistência com metacaulim apoiadas em pilares retangulares e armadas à punção / Experimental analysis of flagstones flat unidirectional of armed concrete of high resistance with leaning metakaolin in rectangular pillars and armadas to the puncture
Foram analisadas experimentalmente 10 (dez) lajes lisas de concreto dosado com metacaulim e concreto de alta resistÃncia (f cc = 60 MPa), ), submetidas a carregamento simÃtrico, objetivando analisar a influÃncia da variaÃÃo do Ãndice de retangularidade dos pilares (min C CmÃx = 1, 3 e 5) e de armaduras de cisalhamento na resistÃncia ao puncionamento
Publicado em: 2006
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20. Punção em lajes cogumelo de concreto armado: análise experimental e numérica. / Punching in reinforced concrete flat slabs: experimental and numerical analysis.
Este trabalho descreve uma pesquisa experimental de lajes cogumelo de concreto armado com armadura de cisalhamento, sem envolver a armadura de flexão. Onze lajes cogumelo quadradas de concreto com 200 mm de espessura e 3000 mm de lado, com uma área central carregada de 200 mm de lado, foram testadas até a ruptura. O principal objetivo dos ensaios foi inve
Publicado em: 2006
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21. THEORETICAL AND EXPERIMENTAL ANALYSIS OF RIBBING FLAT SLABS IN REDUCED SCALE) / ANÁLISE TEÓRICA E EXPERIMENTAL DE LAJES COGUMELO NERVURADAS EM ESCALA REDUZIDA
The experimental analysis of structures of reinforced concrete supplies subsidies to the knowledge of the behavior of structural parts built with this material. Experimental analysis in reduced scale brings great advantages in relation to experimentation of real size models, since the amount of used materials is lesser and the physical conditions for laborat
Publicado em: 2005
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22. Cálculo de lajes lisas com protensão parcial e limitada.
Flat slabs are associated with rationalization, better esthetic conditions and higher speed during construction. The use of post-tension can make this system viable since it strongly improves the structural performance in respect to punching and in case of extreme deflection of the slab. The durability of prestressed concrete elements is assured by meeting t
Publicado em: 2005
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23. Comportamento dos sistemas adesivos com fluor frente ao desafio cariogenico
The aim of this study was to investigate the behavior of fluoride-free and fluoride-containing adhesive systems subject to dynamic chemical induction of secondary caries, by means of the microtensile bond strength test, establishment of carious lesion depth and the amount of fluoride-ion release from each adhesive system. Eighty extracted bovine incisors wer
Publicado em: 2005
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24. Avaliação de tecnicas para inserção da resina composta e da utilização de um composito de baixa viscosidade na resistencia de união a parede gengival de cavidades classe II
The aim of this study was to evaluate the effects of different filling techniques, cavity configuration and use of a low-viscosity composite liner on bond strength to the dentin of Class II cavities gingival floor; analyze the failure modes of fractured specimens; and observe the site available for bonding with a Scanning Electron Microscope (SEM). Standardi
Publicado em: 2003