GFRP筋混凝土梁柱组合体抗震性能试验研究  

Research on seismic behavior of GFRP-reinforced concrete beam-column joints

作　　者：杨丹[1] 贾彬[2] 郭瑞[1] YANG Dan;JIA Bin;GUO Rui(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;School of Civil Engineering and Architecture,Southwest University of Science and Technology,Mianyang 621010,China)

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]西南科技大学土木工程与建筑学院,四川绵阳621010

出　　处：《建筑结构学报》2022年第10期225-236,共12页Journal of Building Structures

基　　金：四川省科技厅重点研发项目(2019YFS0071-01);四川省科技厅项目(2020JDTD00210)。

摘　　要：为提高RC框架结构震后可恢复性,采用GFRP筋替代钢筋应用于混凝土梁柱结构中。以配箍率、轴压比、混凝土强度为变量对梁柱组合体开展了拟静力试验研究。试验中共对8个GFRP筋混凝土梁柱组合体、1个RC梁柱组合体进行了测试,比较了GFRP筋与普通钢筋混凝土梁柱组合体的变形和破坏过程,对比分析了各梁柱组合体的滞回曲线、承载能力、残余位移、能量耗散以及钢筋的应变分布等。试验结果表明:GFRP梁柱顶点残余位移显著下降,较RC柱顶残余位移降低60%左右,但其耗能能力低于RC梁柱节点的;在往复荷载作用下,GFRP筋混凝土梁柱框架破坏符合“强柱弱梁”特征,能够承受较大侧向位移,其在达到5.5%位移角时仍未表现出脆性破坏特征;GFRP筋梁柱组合体承载能力、耗能能力和纵筋利用率随着配箍率、混凝土强度的增加而增大。此外,综合考虑配箍率、轴压比、混凝土强度对GFRP筋梁柱节点核心区受剪性能的影响,提出了该种节点核心区受剪承载力计算方法,并基于国内外相关试验数据对其进行了验证。结果表明,提出的计算式能有效计算GFRP筋梁柱节点核心区受剪承载力。In order to improve the post-earthquake resilience of reinforced concrete(RC) frame structure, GFRP reinforcement was used instead of steel in the concrete beam-column structures in this paper, and quasi-static tests were carried out considering stirrup ratio, axial compression ratio and concrete strength as variables. A total of eight GFRP reinforced concrete beam-column joints and one RC beam-column joints were tested in the experiment. The deformation and damage processes of the nine concrete beam-column joints were compared, and the hysteretic curves, bearing capacity, residual displacement, energy dissipation and strain distribution of the GFRP-reinforced beam-column joints and RC beam-column joints were compared. The test results show that the residual displacement of the joints with GFRP reinforcement is significantly reduced, which is about 60% lower than that of RC beam-column joints, but the energy dissipation capacity of the former is significantly lower than that of the latter. Under the action of cyclic load, the failure of the GFRP reinforced joints conforms to the characteristic of ‘strong columns weak beams’, and the joints can withstand large lateral displacements without showing brittle failure at drift angle of 5.5%. The load carrying capacity, energy dissipation capacity and longitudinal reinforcement utilization rate of the GFRP-reinforced beam-column joints increase with the increase of stirrup ratio and concrete strength. In addition, a method for calculating the shear capacity of the core area of GFRP reinforced beam-column joints was proposed by considering the influence of stirrup ratio, axial compression ratio and concrete strength, and the method was verified based on relevant domestic and international test data. The results show that the calculation formula proposed in this paper can effectively calculate the shear capacity in the core area of GFRP reinforced beam-column joints.

关 键 词：RC框架 GFRP筋混凝土 拟静力试验 残余位移 震后修复性 核心区受剪承载力 

分 类 号：TU375[建筑科学—结构工程] TU317.1