建筑结构

2022, v.52;No.576(12) 49-55

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不锈钢钢筋混凝土框架节点抗震性能试验研究
Experimental research on seismic performance of concrete frame joint with stainless steel reinforcement

徐伟栋;王涵;王晓锋;
XU Weidong;WANG Han;WANG Xiaofeng;Shanghai Tianhua Architecture Planning & Engineering Ltd.;School of Civil Engineering,Tongji University;Central Research Institute of Building and Construction Co., Ltd.,MCC Group;

摘要(Abstract):

通过进行4个配置高强度、高延性、低弹性模量的不锈钢钢筋和2个配置普通钢筋的框架节点拟静力试验,研究了配置不锈钢钢筋对中间层中节点和顶层端节点的破坏形态、滞回曲线、骨架曲线、位移延性等抗震性能的影响,分别分析了轴压比和节点构造对两种节点抗震性能的影响。结果表明:不锈钢钢筋混凝土试件均发生梁端弯曲破坏,但塑性铰集中在梁端较小范围内;不锈钢钢筋混凝土试件的滞回曲线形状与普通钢筋混凝土试件相近,不锈钢钢筋混凝土试件的位移延性系数、最大层间位移角、极限承载力计算值与试验值之比均和普通钢筋混凝土试件相近;中间层中节点试件的轴压比越大,抗震性能越低,但能有效约束节点核心区混凝土,避免剥落;采用梁面纵筋弯折至柱底与柱内纵筋搭接并用锚固板进行锚固连接的顶层端节点区,能有效保证节点的抗震性能。
The quasi-static tests of four joints with high strength, high ductility and low elastic modulus stainless steel reinforcement and two joints with ordinary steel reinforcement were carried out to study the influence of stainless steel reinforcement on the seismic performance of middle layer joints and corner joints, such as failure mode, hysteretic curve, skeleton curve and displacement ductility. The influence of axial compression ratio and node formation on the seismic performance of the two joints were analyzed. The results show that all the stainless steel specimens have bending failure at the beam end, but the plastic hinge is concentrated in the small range of the beam end. The shape of hysteretic curve on stainless steel reinforced concrete specimens is similar to ordinary reinforced concrete specimens. The displacement ductility coefficient, the ultimate displacement angle and the ratio of the calculated value of ultimate bearing capacity to the test of specimens with stainless steel reinforcement are all similar to ordinary reinforced concrete specimens. The larger axial compression ratio, the worse seismic performance of middle layer joints, but it can restrain the concrete in the joint core area effectively and avoid spalling. The corner joints area which longitudinal reinforcement on the beam surface is bent to the bottom of the column and overlapped with the longitudinal reinforcement of the column and all the longitudinal reinforcement is anchored with anchor plate can ensure the seismic performance of the joints effectively.

关键词(KeyWords): 不锈钢钢筋;混凝土框架节点;拟静力试验;抗震性能
stainless steel reinforcement;joint of concrete frame;quasi-static test;seismic performance

Abstract:

Keywords:

基金项目(Foundation): 国家高技术研究发展计划基金项目(2015AA03A502)

作者(Authors): 徐伟栋;王涵;王晓锋;
XU Weidong;WANG Han;WANG Xiaofeng;Shanghai Tianhua Architecture Planning & Engineering Ltd.;School of Civil Engineering,Tongji University;Central Research Institute of Building and Construction Co., Ltd.,MCC Group;

DOI: 10.19701/j.jzjg.ls220025

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