仿古建筑钢结构双梁-柱边节点抗震性能试验研究  

Experimental study on seismic performance of steel double-beams column exterior joints in antique style building

作　　者：薛建阳[1] 吴占景[1] 隋䶮 刘祖强[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《建筑结构学报》2015年第3期80-89,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51208411);西安建筑科技大学创新团队发展计划项目

摘　　要：为研究仿古建筑钢结构双梁-柱边节点的破坏特征和抗震性能,进行了4个比例为1/2的边节点低周反复荷载试验,观察了节点的受力过程及破坏形态,分析了该类节点的荷载-位移滞回曲线、承载能力、变形性能、刚度退化和耗能能力等力学特性。结果表明:仿古建筑钢结构双梁-柱边节点试件在加载过程中形成了上、中、下核心区;节点变形主要发生在下核心区,而中核心区和上核心区的变形很小,始终处于弹性阶段;梁截面形式不同时节点破坏形态有所不同,箱形截面梁节点下核心区出现'X'形的严重扭曲破坏或上部箱形截面柱和内环板连接的焊缝断裂;工形截面梁节点则是阑额上翼缘与节点核心区连接的焊缝断裂;节点的位移延性系数介于1.98~3.61之间,等效黏滞阻尼系数介于0.227~0.387;随着柱轴压比由0.3增大到0.6,节点承载力有所降低。In order to study the seismic behavior of double-beams column exterior joints in antique style building,four specimens in 1 /2 scale of prototype model were tested under low-cycle reversed loading. The failure process and patterns were obtained. The failure characteristics,mechanical behavior such as the load-displacement hysteretic loops,bearing and deformation capacity, degradation of rigidity, energy dissipation capacity of the joints were analyzed. It is shown that there are three small core zones( upper,middle and lower core zone) appeared in the steel double-beams column joint in antique style building,during loading. The main deformation occurs in the lower core zone,while the middle core zone and the upper core zone were still in the elastic stage. As to the different kinds of beam section,joints have different failure mode. Deformation like 'X ' in the lower core zone or weld fractured between the top box section columns and inner-ring plate appears when the box section beam joints are destroyed ultimately. But weld between the top flange of Lan'e and the column fractures when the H-shape section beam joint has failed. The displacement ductility factor of the story drift is between 1. 98 and 3. 61,and the equivalent viscous damping coefficient is about 0. 227 to 0. 387. With axial compression ratio of column increased from 0. 3 to 0. 6,the load carrying capacity is decreased.

关 键 词：仿古建筑 钢结构 双梁-柱边节点 拟静力试验 抗震性能 

分 类 号：TU391[建筑科学—结构工程]