带钢桁架水平加强层的高层混合结构抗震性能分析

SEISMIC BEHAVIOR ANALYSIS OF THE HYBRID STRUCTURE WITH STEEL-TRUSS STRENGTHENED STORY

近年来,混合结构由于施工速度快和成本较低,已经成为我国超高层建筑的首选结构形式。研究它的抗震性能具有重大的社会意义。通过理论计算,深入分析设置水平加强层后,混合结构顶点位移与结构刚度变化的关系。通过一工程算例,对7度罕遇地震下结构的抗震性能指标进行分析,研究表明,混合结构在设置水平加强层后,结构的整体抗侧刚度增大,顶点位移和层间位移角得到有效减小,自振周期也减小。但在水平加强层位置处外框架柱和核心筒的内力发生较大突变,突变的程度会随着加强层设置数目的增加而趋于缓和。因此建议在设计中适当增加加强层的数量,减小每道加强层的刚度,在加强层上下楼层采取加强箍筋配筋等抗震措施。

Due to quick construction and low cost,Hybrid structure have already become the first choice of the tall building structure form in China recently.To study its anti-earthquake behavior has huge social contribution.The relationship between the displacement and the stiffness of the structure with the steel-truss strengthened story was analyzed by the theories calculation.According to the seismic behavior analysis of the hybrid structure in the rare earthquake of seven degree,the anti-side stiffness increase,the top displacement and the floor inter-story drift angle reduce,and the natural vibration period of structure reduce too.But the column and the core tube＇s internal force occur a bigger mutation,the degree of mutation will incline to modify by increasing the number of the strengthened story.So we should increase the strengthened story＇s number and reduce the stiffness of the every strengthened story,strengthen the stirrup anti-earthquake measure at the top and bottom floor of the strengthened story.