Spalling of concrete cover of fiber-reinforced polymer reinforced concrete under thermal loads

A finite element method using a proposed mesoscopic thermoelastic damage model (MTED) is verified for simulating the cracking process of a concrete section reinforced with fibre-reinforced polymer (FRP) bars. The cracking was due to the significant difference in thermal expansion properties between...

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Bibliographic Details
Published in:Materials and structures 2006-12, Vol.39 (10), p.991-999
Main Authors: Wong, Yuk-Lung, Fu, Yu-Fang, Poon, Chi-Sun, Tang, Chun-An
Format: Article
Language:English
Subjects:
Bars
Building construction
Building materials
Civil engineering
Computer simulation
Concrete
Critical temperature
Fiber reinforced plastics
Horizontal
Mathematical analysis
Mathematical models
Reinforcing steels
Studies
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Summary:A finite element method using a proposed mesoscopic thermoelastic damage model (MTED) is verified for simulating the cracking process of a concrete section reinforced with fibre-reinforced polymer (FRP) bars. The cracking was due to the significant difference in thermal expansion properties between the concrete and the FRP materials at elevated temperatures. The numerical study reveals that although a conventional elastic analytical method can provide good estimates of the critical temperature increment of concrete cover failure of a cylindrical concrete section that is reinforced with a single bar, it gives too conservative predictions for typical rectangular sections with multiple bars. The study also shows that the concrete cover and the horizontal bar spacing have more influence than the vertical bar spacing on the determination of the critical temperature increments. Horizontal lapping of bars significantly lowers the critical temperature increment.[PUBLICATION ABSTRACT]
ISSN:1359-5997
1871-6873
DOI:10.1007/s11527-005-9032-5