Fatigue durability of concrete externally strengthened with FRP sheets

Title: Fatigue durability of concrete externally strengthened with FRP sheets
Author(s): H. Diab, Z. Wu
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 507 - 516
Total Pages: 10
Nb references: 10
Language: English

Abstract: A primary concern of the FRP-strengthened structures is local debonding of FRP-concrete interface, which affects negatively the structural integrity and long-term durability of strengthened members. This paper concerns the development of a nonlinear hybrid model for studying the FRP-concrete interface behavior under fatigue loading. Based on the creepfatigue interaction, the proposed model describes the behavior of the FRP-concrete interface before debonding initiation. The fatigue debond process is governed by the softening model that depends on the strain fracture energy of the FRP-concrete interface and a damage accumulation factor. A series of double lap shear specimens subjected to variable maximum fatigue loading has been carried out to calibrate and validate the proposed model. The results show the ability of the proposed model not only to predict the fatigue life of double-lap shear specimens, but also to provide useful insight into the failure mechanism of the FRP-concrete interface due to fatigue loading. This model can also be used to understand the fatigue deformation and FRP sheet strain distributions due to fatigue loading. This model allows for the numerical study of the fatigue performance of structures that are externally strengthened with FRP sheets.

Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00

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