防屈曲耗能支撑钢管混凝土柱-钢梁组合框架子结构拟动力试验研究

Substructure pseudo-dynamic tests of a concrete filled steel tubular column-steel beam composite frame with buckling restrained braces

为研究防屈曲耗能支撑在组合框架结构中的减震效果,设计了1榀10层3跨防屈曲耗能支撑钢管混凝土柱-钢梁组合框架,利用网络化结构实验室NetSLab进行了1/3缩尺的子结构拟动力试验,分析楼层剪力、支撑剪力与层间位移之间的响应关系。结果表明:在多遇烈度地震作用下,主体框架与支撑均处于弹性工作状态;在基本烈度地震作用下,主体框架处于弹性工作状态,支撑开始屈服耗能;在罕遇烈度地震作用下,主体框架基本处于弹性工作状态,而支撑则出现明显的滞回耗能效果。由楼层位移时程曲线可知,结构底层层间位移比其他各层大很多,满足组合框架结构多道抗震设防的要求。

To investigate the seismic mitigation effect of buckling restrained brace（BRB） for composite frame structures,a ten-story and three-bay concrete filled steel tubular column-steel beam composite frame with BRBs was designed and substructure pseudo-dynamic test of its 1/3 scaled model was carried out with networked structural laboratory system（NetSLab）.Based on the responses of story shear force,brace force,and inter-story drift,it can be learned that：under the frequent occurrence earthquake loading,both the main frame and BRBs are elastic;under the design basis earthquake loading,the main frame remains elastic and BRBs begin to yield for energy consumption;under the maximum considered earthquake loading,the main frame is still elastic and the BRBs perform with apparent hysteretic energy dissipation.From the time history curves of story displacement,the first story has a substantially larger drift,which indicates the frame meets the multi-level seismic design criteria simultaneously.