摘要
为考察BFRP侧向约束对GFRP带肋筋与混凝土粘结性能的影响,对36个GFRP筋混凝土拉拔试件进行试验研究,主要试验参数为BFRP侧向约束层数(0层、1层、2层和3层)和混凝土相对保护层厚度c/d(1.6、2.2和3.0)。试验结果表明:BFRP侧向约束使拉拔试件的破坏模式由混凝土劈裂破坏转为GFRP带肋筋的拔出破坏;试件的粘结强度和达到粘结强度所对应的滑移量、侧向约束应力会随BFRP侧向约束层数的增加而增大;相同BFRP侧向约束层数下,相对粘结强度随着c/d的增大而增大,但达到粘结强度所对应的侧向约束应力却随c/d的增大呈指数减小;相对粘结强度增加量随着达到粘结强度时侧向约束应力的增加呈对数增加。
A total of 36 pull-out specimens were tested to evaluate the bond behavior between GFRP ribbed bars and BFRP-confined concrete.Test parameters included BFRP layers(0 ply,1 ply,2 plies and 3 plies)and the concrete cover to bar diameter ratio c/d(1.6,2.2 and 3.0).The test results indicated that the typical failure mode of the specimens was changed from brittle splitting failure to ductile pull-out failure due to the lateral confinement of BFRP.The bond strength and the corresponding slip as well as confining stress were increased with the increasing number of BFRP layers.Based on the same BFRP confinement,normalized bond strength was increased with the increase of c/d,while the confining stress corresponding to bond strength was increased exponentially with the deceasing c/d.A logarithmical relationship was observed between the increment of normalized bond strength and the confining stress of BFRP corresponding to the bond strength.
作者
王言磊
王密锋
张学
许清风
WANG Yan-lei;WANG Mi-feng;ZHANG Xue;XU Qing-feng(School of Civil Engineering,Dalian University of Technology,Dalian 116024,China;Shanghai Key Laboratory of Engineering Structure Safety,SRIBS,Shanghai 200032,China)
出处
《复合材料科学与工程》
CAS
北大核心
2020年第4期5-12,共8页
Composites Science and Engineering
基金
国家重点研发计划项目(2017YFC0703000)
国家自然科学基金面上项目(51778102,51978126)
中央高校基本科研业务费项目(DUT18LK35)
辽宁省自然科学基金项目(20180550763)
上海市工程结构安全重点实验室开放课题(2018-KF04,2019-KF03)。
