Bond performance between fibre-reinforced polymer bars and concrete under pull-out tests

被引:102
|
作者
Wei, Wei [1 ]
Liu, Feng [1 ]
Xiong, Zhe [1 ]
Lu, Zhongyu [1 ]
Li, Lijuan [1 ]
机构
[1] Guangdong Univ Technol, Sch Civil & Transportat Engn, Guangzhou 510006, Guangdong, Peoples R China
基金
中国国家自然科学基金;
关键词
FRP bars; Pull-out tests; Bond mechanism; Bond stress-slip curve; Constitutive model; FRP BARS; DEVELOPMENT LENGTH; GFRP BARS; BEHAVIOR; STRENGTH; SLIP; STRAIGHT; COLUMNS; REBARS; MODELS;
D O I
10.1016/j.conbuildmat.2019.116803
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
In this study, the bond performance between fibre-reinforced polymer (FRP) bars and concrete was investigated by means of forty-eight pull-out tests. The influences of the diameter, type, and surface treatment of the FRP bars were considered. Two failure modes, including the pull-out mode and concrete splitting, were observed. The bond mechanism, bond strength, and bond stressslip curve were discussed. It was found that (1) The force transfer mechanism of FRP bars with sand coating was mainly controlled by friction, while that of bars with helical wrapping or screw thread was mainly controlled by mechanical interlocking. (2) Carbon fibre reinforced polymer (CFRP) bars and a helical wrapping or screw thread surface treatment could improve the bond strength. (3) The bond stressslip curve of FRP bars with sand coating showed a very steep characteristic at the initial micro-slippage segment, while that of bars with helical wrapping or screw thread exhibited a periodic variation. Two new bond stressslip constitutive models were proposed. Compared with the existing models, the proposed models had higher fitting accuracy and universal applicability for the whole bond stressslip curve. Finite element (FE) models were established and verified. Based on the FE results, a formula to estimate the anchorage length of FRP bars was proposed. (C) 2019 Elsevier Ltd. All rights reserved.
引用
收藏
页数:14
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