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Research on Mechanical Behavior of GFRP Bars in High Temperature(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2006年01期
Page:
23-28
Research Field:
Publishing date:
2006-03-20

Info

Title:
Research on Mechanical Behavior of GFRP Bars in High Temperature
Author(s):
ZHOU Chang-dong;  LU Xi-lin;  JIN Ye
State Key Laboratory for Disaster Reduction in Civil Engineering, Tongji University, Shanghai 200092, China
Keywords:
bond strength;  GFRP bar;  fire;  high temperature;  mechanical behavior
PACS:
TU541
DOI:
-
Abstract:
The fire-resistance behavior of FRP bars is lower than that of steel reinforcement. Experimental studies were carried out on 100(27 groups)GFRP bars exposed to high temperature under axial load to investigate the mechanical behavior of GFRP bars under fire and after fire. The parameters considered are temperature variation and the time exposed to high temperature. The tensile strength and the elastic modulus of GFRP bars were investigated through test. The test results were obtained during and after high temperature exposure and indicate that the mechanical behavior of GFRP bars has obvious phasic changes: the resin will soften when temperature is higher than 110 °C. At this point, the resin will no longer be able to transfer stresses from fiber to fiber, but the bond strength of resin will be recovered when temperature decreased. The resin will be carbonized when temperature is higher than 190 °C. At this point, the bond strength of resin will not be recovered. When the strength and the elastic modulus of GFRP bars decrease with the rise of temperature, it can be recovered when the highest temperature experienced is under 190 °C. The results can be applied to fire resistance design of GFRP reinforced concrete structures.

References:

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Memo

Memo:
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Last Update: 2006-03-20