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Doctoral Thesis
DOI
10.11606/T.18.2011.tde-20092011-110345
Document
Author
Full name
Leonardo Melo Bezerra
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2011
Supervisor
Committee
El Debs, Ana Lucia Homce de Cresce (President)
Bittencourt, Tulio Nogueira
Malite, Maximiliano
Munaiar Neto, Jorge
Vellasco, Pedro Colmar Gonçalves da Silva
Title in Portuguese
Estudo teórico-experimental da ligação entre pilares mistos preenchidos e vigas pré-moldadas de concreto
Keywords in Portuguese
Concreto
Estruturas híbridas
Ligação
Pilar misto preenchido
Viga pré-moldada
Abstract in Portuguese
Neste trabalho, ligações entre vigas pré-moldadas de concreto e pilares mistos preenchidos foram propostas com a finalidade de transferir momento de flexão e força cortante das vigas para os pilares mobilizando os núcleos de concreto. Foi realizado um estudo numérico-experimental das ligações onde foi avaliada a viabilidade e a eficiência destas na transferência dos esforços. Em uma primeira fase, modelos compostos por pilar misto e consolo metálico (modelos 1 e 2) foram confeccionados, testados experimentalmente e modelados numericamente (método dos elementos finitos) para avaliar a eficiência do consolo na transferência da força cortante. Observou-se que a transferência da força cortante do consolo para o tubo metálico foi eficaz. O consolo se comportou de maneira previsível e suportou cargas elevadas. O uso de conectores de cisalhamento internos aos pilares aumentou a capacidade de carga e o desempenho dos mesmos. Na etapa seguinte da pesquisa foram confeccionados dois modelos, compostos por: pilar, viga pré-moldada, laje e consolo formando pórticos. Em um destes modelos (modelo 4) uma caixa metálica foi incorporada à viga pré-moldada e parafusado ao consolo metálico com a finalidade de transferir os momentos positivos, enquanto que outro modelo foi confeccionado e estudado sem este elemento (modelo 3). Nestes modelos foi avaliada a capacidade de transferência do momento de flexão (positivo e negativo) e forças cortantes com a ligação submetida a ciclos de carga. No modelo 3, a ligação transferiu de forma eficiente o momento negativo, porém o desempenho para o momento positivo não foi satisfatório, com baixa resistência e rigidez ao longo dos ciclos de carga. No modelo 4 foi observado considerável aumento da resistência e rigidez se comparado com o modelo anterior. Entretanto, a caixa metálica incorporada à viga pré-moldada não foi capaz de fazer com que a ligação resistisse aos momentos positivos como a mesma eficiência que resistiu aos negativos e houve degradação de suas características estruturais ao longo dos ciclos de carga.
Title in English
Experimental and theoretical study of precast concrete beam to concrete-filled steel tube column connection
Keywords in English
Concrete
Concrete-filled steel tube column
Connections
Hybrid structures
Precast beam
Abstract in English
In this work, connections of precast concrete beam to concrete-filled steel tube column were proposed to transfer the bending moment and shear forces from the beam to the composite column, mobilizing the concrete core. Was performed a numerical and experimental study of the proposed connections to evaluate the feasibility and effectiveness of them in the transfer of bending and shear forces from the beam to the column. In a first stage, models composed by column and steel corbel (models 1 e 2) were numerically and experimentally tested aiming the efficiency of the connection in shear transfer. It was observed that the transfer of shear to the steel tube was guaranteed. The corbel behaved in a predictable way and supported high loads. The use of shear connectors in the column increased the load capacity and improved the connection performance. In next stage of the research work, two models were prepared, composed by: column, precast concrete beam, steel corbel and slabs constituting frames. In one of these models (model 4) a steel box was incorporated into the precast beam and bolted to the steel corbel in order to transfer the positive moments, whereas another model was built and studied without this device (model 3). In this models were evaluated the efficiency in the transfer of bending moments (positive and negative) and shear forces with the models subjected to a cyclic loads. In the model 3, the connection transferred efficiently the negative bending, but the performance for the positive bending was not satisfactory, with reduced strength and stiffness over the load cycles. In model 4 was observed considerable increase in strength and stiffness compared with the previous model. However, the device incorporated in the precast beam was unable to make the connection resist to the positive moments with the same efficiency observed when subjected to the negative moments and a degradation of their structural characteristics was observed during the loading cycles.
 
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Publishing Date
2011-09-21
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • BEZERRA, L. M., El Debs, A.L.H.C., and DEBS, Mounir Khalil El. Precast concrete beam and concrete-filled steel tube column connection by steel corbel. Concrete Plant International , 2012, vol. 6, p. 156.
  • BEZERRA, L. M., El Debs, A. L. H. C., and DEBS, Mounir Khalil El. Precast concrete beam and concrete-filled steel tube column connection by steel corbel. In FIB SYMPOSIUM, Praga, República Tcheca, Jun. 2011, Praga, 2011. Proceedings Prague: Czech Concrete Society, 2011. p. 1101-1104. v. 2. ISBN: 978-80-87158-29-6.., 2011.
All rights of the thesis/dissertation are from the authors
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