带钢桁架转换结构弹塑性抗震性能研究

Study on elastic⁃plastic seismic performance of structure with steel truss transfer stories

通过一栋带钢桁架转换层框架-剪力墙结构弹塑性时程分析和模型振动台试验,研究了结构的动力弹塑性地震反应及其损伤。结果表明,在罕遇地震作用下结构进入轻微塑性状态,刚度退化缓慢,弹塑性变形满足位移角限值要求;钢桁架转换层及其相邻层为薄弱层,剪力墙边缘构件内置型钢提高了其延性和水平承载力,增强了薄弱部位的抗震性能;型钢混凝土框架柱损伤轻微,抗震承载力冗余较多,能够起到“第二道抗震防线”的作用。带钢桁架转换结构整体抗震性能良好,满足大震下抗震性能目标的要求。

Based on elasto⁃plastic time⁃history analysis and a shaking table experiment of a frame⁃shearwall structure model with steel truss transfer stories,the seismic responses and damage in elastic⁃plastic phases of the structure are studied.The results show that the structure enters a slight plastic state under the action of rare earthquakes,the stiffness degradation is slow,and the elastic⁃plastic deformation meets the requirements of the dispalcement angle limit.The steel truss transfer layer and its adjacent layers are weak.To improve its ductility and seismic capacity,steels were built in the edge members of shear walls.The steel reinforced concrete column with high seismic capacity could realize the two defense line mechanism.However,the seismic performance of the steel truss transfer stories is good and the overall structure meets seismic performance objectives under the rare earthquake.