R/C structures strengthened with CFRP part II: analysis of shear models

Abstracts

Este artigo corresponde à segunda parte de trabalho visando à avaliação de modelos de projeto de estruturas de concreto armado reforçadas com Polímeros Reforçados com Fibras de Carbono (PRFC). São avaliados modelos de cisalhamento correspondentes às recomendações ACI-440 e fib-14, além de outros modelos mais recentes, disponíveis na literatura. Esses modelos foram aplicados na análise de oito vigas "T" reforçadas ao cisalhamento com tiras de PRFC. Diferentes tipos de compósitos de fibras de carbono (tecidos e laminados) disponíveis no mercado brasileiro, de diferentes fabricantes, foram aplicados neste estudo. Os resultados obtidos indicam um ganho de capacidade resistente e ductilidade das vigas reforçadas, a partir do mecanismo de ancoragem usado nas tiras de PRFC, e que nenhum dos modelos analíticos testados foi capaz de reproduzir satisfatoriamente o comportamento estrutural observado nos experimentos.

polímeros reforçados com fibras de carbono; reforço ao cisalhamento; ensaios experimentais; modelos analíticos

R/C structures strengthened with CFRP part II: Analysis of shear models

A. L. Gamino^I; J. L. A. O. Sousa^II; O. L. Manzoli^III; T. N. Bittencourt^IV

^IPost-Doctoral Researcher, School of Civil Engineering, Architecture and Urbanism, University of Campinas, [e-mail],[e-mail], Av. Albert Einstein 951, Campinas-SP, CEP 13083-852

^IIProfessor, School of Civil Engineering, Architecture and Urbanism, University of Campinas, [e-mail],[e-mail], Av. Albert Einstein 951, Campinas-SP, CEP 13083-852

^IIIAssociate Professor, São Paulo State University, [e-mail],[e-mail], Av. Luiz Edmundo Carrijo, s/n, Bauru-SP, CEP 17033-360

^IVAssociate Professor, Polytechnical School, University of São Paulo, [e-mail],[e-mail], Av. Prof. Almeida Prado, 271, São Paulo-SP, CEP 05508-900

ABSTRACT

This paper corresponds to the second part of a work intended to evaluate the design models of reinforced concrete structures strength- ened with Carbon Fiber Reinforced Polymers (CFRP). The shear models analyzed correspond to the guidelines ACI 440 and fib-14, as well as more recent formulations, available in the literature. Such models were applied to eight "T" beams strengthened to shear with CFRP composites strips. Different types of carbon fiber composites (sheets and laminates), from different manufacturers, available in the Brazilian market, were applied. The analyses indicate that anchorage mechanism helps increasing load capacity and ductility and that none of the tested analytical models were capable of reproducing satisfactorily the observed behavior of the tested beams.

Keywords: carbon fiber reinforced polymers, shear strengthening, experimental tests, analytical models.

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Publication Dates

• Publication in this collection
  17 Sept 2014
• Date of issue
  Mar 2010

History

• Received
  16 June 2009
• Accepted
  18 Aug 2009