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Master's Dissertation
DOI
Document
Author
Full name
João Paulo Ribeiro Dantas
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2010
Supervisor
Committee
Stucchi, Fernando Rebouças (President)
El Debs, Mounir Khalil
Oyamada, Rui Nobhiro
Title in Portuguese
Investigação experimental da fadiga em lajes de pontes armadas com barras ou telas soldadas.
Keywords in Portuguese
Ensaios de barra ao ar
Ensaios dinâmicos
Fadiga de barras de aço
Fadiga em lajes de concreto armado
Fadiga em telas soldadas
Abstract in Portuguese
Este trabalho apresenta estudos, ensaios e análises de resultados a respeito do comportamento à fadiga das estruturas de concreto armadas com barras isoladas e telas soldadas, começando pelas lajes de pontes, seus elementos mais sensíveis à fadiga. A parte experimental desta pesquisa consiste na investigação experimental do comportamento à fadiga de lajes de concreto armado, executadas com e sem pré-lajes armadas com barras de aço isoladas ou em tela soldada. Foram realizados ensaios de fadiga de barra ao ar em 36 corpos de prova de CA50 f10 mm, isoladas e em tela, com o objetivo de construir a Curva de Wöhler dessas barras de produção nacional. Além disso, foram ensaiadas 20 lajes executadas com e sem pré-lajes de concreto, montadas com diversas configurações de armadura, submetidas a ensaios estáticos e dinâmicos. A configuração de armadura adotada nas lajes da pesquisa foi baseada nas utilizadas com freqüência neste tipo de elemento das pontes. A escassez de dados precisos a respeito do comportamento de lajes armadas com barras ou com telas soldadas de fabricação brasileira submetidas a ações cíclicas conduziu ao propósito de se elaborar uma pesquisa de caráter experimental sobre esse tema, cujos resultados e conclusões pudessem fornecer informações mais precisas a respeito do desempenho das lajes.
Title in English
Experimental investigation of fatigue in bridge slabs reinforced with rebars or steel mesh.
Keywords in English
Axial tests in air
Dynamic tests
Fatigue in concrete slabs
Fatigue in mesh
Fatigue in rebars
Abstract in English
This research presents the studies, tests and the analysis of the results about the behavior of concrete structures reinforced with rebars or steel mesh due to fatigue loading, starting with bridge slabs which are the most susceptible elements to fatigue. The experimental part of this research consists in testing the behavior due to fatigue of concrete slabs, with or without pre-slabs and reinforced with continuous bars or steel mesh. Axial testing in air of 36 specimens of CA50 f10 mm in continuous bars and mesh were made in order to build the Wöhler Curve for Brazilian conditions. Beyond that, tests were made in 20 concrete slabs with pre-slabs, with several reinforcements arrangement. The 20 slabs were submitted to static and dynamic loading. The reinforcement configuration was based on the commonly used for these elements. The scarcity of more precise data about the behavior of concrete slabs reinforced with rebars or welded mesh made in Brazil submitted to cycle loading was the major reason to make a research based on the testing results about this theme, which results and conclusions are capable of producing more accurate information about the behavior of the slabs.
 
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Publishing Date
2010-12-02
 
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