翼缘削弱的型钢混凝土节点试验与有限元分析

Experimental Study and Finite Element Analysis of SRC Joints of Weakening of Flanges of Steel

通过对1个足尺寸节点试件的低周反复荷载试验和分析,研究了翼缘削弱的型钢混凝土节点的抗震性能。试件按"强节点"设计且对节点核心区附近梁端工字形型钢的上、下翼缘采取狗骨式削弱并适当增加梁端根部到型钢翼缘最大削弱部位纵向钢筋的配筋量。试验结果表明:节点试件的位移延性系数为5.88,符合抗震设计的延性要求;在最大荷载时,试件的等效粘滞阻尼系数为0.34,耗能能力强。有限元分析表明:在型钢混凝土节点中采用这种构造措施,能够把塑性铰控制在梁型钢翼缘削弱的位置,从而降低节点核心区所受的剪力以及梁柱连接焊缝的应力。翼缘削弱的型钢混凝土节点数值模拟结果与试验结果吻合较好,表明所建立的型钢混凝土节点数值模拟技术合理,可用于对型钢混凝土节点受力性能进行深入研究。

The seismic behavior of steel remtorced concrete joints oI weakening of steel has been investiga ted,based on the experiment and analysis of 1 full-sized joint specimens, under cyclic loading. The joints designed as strong connection is treated with dog-bone style weakening on the upper and below flanges of the H-type steel at the beam end near the joint core and the ratio of reinforcement ,which distribute from the root of beam end to the maximum weak ened flanges of the H-type steel, is increased . The tested results show that the ductility factor of the specimen joint is from 5.88, which meet the requirement of the ductile frame in the seismic design, and their equivalent viscous damping coefficient at the maximum loads is 0. 34 , tests indicate that the energy dissipation is quite higher. The finite element an alyzed results show that the plastic hinges can be transferred from the root of beam end to the weakened position by the constitution, thus the shear of the plastic hinges in the beams and the stress of seam in beam-column are decreased effec tively. The numerical simulation results of the specimen were in good agreement with the experimental results conducted before. It shows that the numerical simulation technology presented is feasible and can be applied to further research on mechanical behaviors of SRC joints.of flanges