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Master's Dissertation
DOI
https://doi.org/10.11606/D.18.2009.tde-20052024-183527
Document
Author
Full name
Fredy Enrique Garzon Reyes
Institute/School/College
Knowledge Area
Date of Defense
Published
São Carlos, 2009
Supervisor
Committee
Debs, Ana Lucia Homce de Cresce El (President)
Barbosa, Mônica Pinto
Giongo, Jose Samuel
Title in Portuguese
Análise da aderência entre barras de aço e concretos (CC, CAA e CAARFA), sob influência de ações monotônicas e cíclicas
Keywords in Portuguese
aderência
arrancamento
carregamento cíclico
carregamento monotônico
Concreto Auto-Adensáveis (CAA)
Concreto Convencional (CC)
fibras metálicas
Abstract in Portuguese
Atualmente, está cada vez mais comum a utilização de concretos de alto desempenho, em virtude de propriedades como durabilidade, resistência e trabalhabilidade. Esta situação requer maiores taxas de armadura, que resultam em locais de difícil concretagem, geralmente submetidos a ações monotônicas e cíclicas (e.g. nós de pórtico). Por este motivo, o desenvolvimento de um material que garanta a homogeneidade de seções transversais e da aderência entre a armadura e o concreto é indispensável. Uma alternativa técnica com grande potencial, o concreto auto-adensável é muito indicado para atingir essas propriedades, principalmente quando incorpora fibras de aço. O propósito deste trabalho é comparar os resultados da resistência de aderência entre concreto comum (CC), concreto auto-adensável (CAA) e concreto auto-adensável com fibras de aço (CAAFA), quando submetidos a ações monotônicas e cíclicas. No procedimento experimental desta pesquisa foram adotados os modelos de arrancamento padronizados pelo Rilem-Ceb-Fib (1973) e utilizadas barras de aço de diâmetros de 10 mm e 16 mm (tensão de escoamento de 500 MPa), em concretos com resistências médias à compressão de 30 MPa e de 60 MPa, aos 28 dias. A resistência de aderência foi avaliada em ensaios de arrancamento, sob ações monotônicas e cíclicas, conforme as recomendações do ACI 408.2R-92. Os resultados obtidos indicaram que os ensaios de arrancamento, sob ações monotônicas e cíclicas, são eficazes para a análise da resistência de aderência nos tipos de concretos nas condições analisadas. Verificou-se, além disso, que os modelos de arrancamento em CAA e CAAFA apresentam comportamento similar aos de CC e que o diâmetro da barra possui influência significativa na resistência de aderência
Title in English
Bond analysis between steel bars and concretes (OC, SCC and SCCSF) under influence monotonic and cyclic loading
Keywords in English
bond
cyclic loading
fiber steel
monotonic loading
Ordinary Concrete (OC)
pull-out
Self-Compacting Concrete (SCC)
Abstract in English
Currently, it is increasingly common the use of high-strength concrete, due to the durability, strength and workability. This requires higher reinforcement ratio which results in places with difficult cast, and these regions generally are subject to monotonic and cyclical loading (e.g. frame nodes). Hence, it is necessary to develop a material that ensures the cross-section homogeneity, as well as the bond between reinforcement and concrete; like this, the self-compacting concrete became a technical alternative with great potential to achieve these required properties and even more when is incorporated steel fibers. The aim of this work is to compare the bond strength results between the ordinary concrete (OC), the self-compacting concrete (SCC) and the self-compacting concrete with steel fiber reinforced (SCCSF) when subjected to monotonic and cyclic loads. In this research the experimental program consisted of standard pull-out specimens according with the Rilem-Ceb-Fib (1973) bars of 10 mm and 16 mm (yield stress of 500 MPa) in concrete compressive strength in the range of 30 MPa and 60 MPa at 28 days were used. The bond strength was evaluated by the pull-out tests under monotonic and cyclic loading according with the recommendations of ACI 408.2R-92. The results indicated that the pull-out tests are effective to analyze the bond stress in the used concretes and conditions of test. Furthermore it was verified that the SCC and SCCSF pull-out specimens have similar behavior to those in OC and the diameter of the bar has significant influence on bond strength
 
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Publishing Date
2024-05-22
 
WARNING: The material described below relates to works resulting from this thesis or dissertation. The contents of these works are the author's responsibility.
  • Reyes, F. G., et al. Bond strength behavior of self-compacting concrete under cyclic loading in pull-out tests. In ANNUAL INTERNATIONAL FIB SYMPOSIUM, 11., London, June, 2009., Londres, 2009. ANNUAL INTERNATIONAL FIB SYMPOSIUM, 11., London, June, 2009. Proceedings fib-CEB-FIP., 2009.
  • Reyes, F. G., et al. Experimental study of bond between steel bars and self-compacting concrete with steel fiber. In INTERNATIONAL fib CONGRESS EXHIBITION, 3./ PCI ANNUAL CONVENTION AND BRIDGE CONFERENCE, Washington, May 29 June 2, 2010, Washington, 2010. Proceedings Lausanne: The Precast/Prestressed Concrete Institute (PCI), 2010. p. 1-10. ISBN: 978-2-88394-096-3.., 2010.
All rights of the thesis/dissertation are from the authors
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