多层冷弯薄壁型钢-钢板剪力墙结构高宽比限值研究

Research on height⁃width ratio limits of multi⁃story cold⁃formed steel⁃steel plate shear wall structures

以六层冷弯薄壁型钢-钢板剪力墙足尺试件振动台试验数据为基础,得到了结构的自振周期、加速度放大系数及位移反应。基于ABAQUS软件并通过与试验结果对比验证,建立了多层冷弯薄壁型钢-钢板剪力墙结构的有限元模型并据此进行参数分析,得到了不同烈度罕遇地震作用下结构的动力特性及层间位移角,分析了房屋高宽比对冷弯薄壁型钢-钢板剪力墙结构抗震性能的影响。研究结果表明:随房屋高宽比增大,结构的自振周期呈线性增长,层间位移角增大。将结构薄弱层的层间位移角峰值与规范中弹塑性层间位移角限值进行对比分析,提出了多层冷弯薄壁型钢-钢板剪力墙结构在不同烈度罕遇地震作用下的高宽比限值要求。

Based on the shaking table test results of six⁃story cold⁃formed steel⁃steel plate shear wall structure(CFS⁃SPSWS)full⁃scale specimens,the fundamental period,acceleration amplification factor and displacement response are obtained.Employing software ABAQUS,the finite element(FE)models of the tested specimens are established and verified against the test results,and then an extensive parametric analysis is conducted.The dynamic characteristics and story drift angles of the structure under rare earthquakes with different intensities are obtained,and the effect of height⁃width ratios on the seismic performance of the CFS⁃SPSWS are analyzed.The results show that with the enhancements of the height⁃width ratio,the fundamental period increases linearly,and the story drift angles increases.The amplitude of story drift angles of the weak layer of the structure is compared with the limit value of elastic⁃plastic story drift angles in the code,and the limit value requirements of height⁃width ratio of multi⁃story CFS⁃SPSWSs under rare earthquakes of different intensities are put forward.