不同轴压比下GFRP-RC梁柱节点抗震性能研究  

Study on seismic performance of GFRP-RC beam-column joints under different axial compression ratios

作　　者：赵玉帅 张营营[1,2] 刘金仓 徐俊豪 尹世平 ZHAO Yushuai;ZHANG Yingying;LIU Jincang;XU Junhao;YIN Shiping(Jiangsu Key Laboratory of Disaster Impact and Intelligent Prevention in Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Mechanics and Civil Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学江苏省土木工程灾变与智能防控高校重点实验室,江苏徐州221116 [2]中国矿业大学力学与土木工程学院,江苏徐州221116

出　　处：《建筑结构学报》2024年第11期117-130,共14页Journal of Building Structures

基　　金：国家自然科学基金项目(52278229,52278322);江苏省重点研发计划(社会发展)项目(BE2019642)。

摘　　要：为研究轴压比对GFRP筋混凝土(GFRP-RC)梁柱节点抗震性能的影响机理,开展不同侧压下GFRP筋与混凝土的黏结拉拔试验,并建立荷载约束状态界面黏结滑移本构模型,通过节点试件拟静力试验和数值模拟,研究了不同轴压比下GFRP-RC梁柱节点的破坏模式和承载性能变化规律。结果表明:GFRP筋与混凝土界面黏结强度随侧向压应力的增大近似线性增长;数值模拟中节点核心区的筋材与混凝土界面采用约束黏结滑移模型,能够更为精确地反映不同轴压比下GFRP-RC节点的承载特性;轴压比在0.15~0.35范围内时,轴压比每增大0.1,节点的承载力增大约7%;通过限制梁柱节点区的筋材黏结滑移和混凝土裂缝发展,实现节点试件刚度、延性和耗能能力的提升,有利于形成“更强节点”的受力机制。To study the mechanism of the influence of axial compression ratio on the seismic performance of GFRP-reinforced concrete(GFRP-RC) beam-column joints,pull-out tests were conducted to investigate the bond between GFRP bars and concrete under various lateral pressure,and the corresponding bond-slip constitutive model was established.Through quasi-static tests and numerical simulation analyses of the joints,the failure modes and bearing capacity of GFRP-RC joints under different axial compression ratios were studied.The results show that the bond strength between GFRP bars and concrete increases approximately linearly with the lateral compressive stress.In the numerical simulation,the proposed bond-slip model accounting for the lateral pressure in the joint domain can more accurately reflect the bearing characteristics of GFRP-RC joints under different axial compression ratios.When the axial compression ratio is within the range of 0.15-0.35,the bearing capacity of the joint increases by about 7% with an increase of 0.1 in axial compression ratio.By restraining the bond-slip of reinforcement and cracks of concrete in the joint domain,the stiffness,ductility,and energy dissipation capacity of the joint specimens are improved,which is conducive to forming the “stronger joint” mechanism.

关 键 词：梁柱节点 GFRP筋 轴压比 拟静力试验 数值模拟 界面性能 抗震性能 

分 类 号：TU375[建筑科学—结构工程] TU317.1