搭接柱转换大底盘多塔楼结构抗震性能分析

Seismic performance of multi-tower structure with large podium and overlapping column

针对大底盘多塔楼复杂高层结构采用搭接柱进行竖向构件转换的特点,以一个14层的双塔楼采用搭接柱转换的实际工程为主要研究对象,采用缩尺比为1/15的模型,对其进行模拟地震整体结构振动台试验,依次对整体模型进行7度多遇,7度基本,7度罕遇以及8度罕遇地震输入,研究整体结构的破坏模式与抗震性能,并且采用MIDAS软件进行整体结构有限元对比分析研究。研究结果表明:本工程中的搭接柱以及与搭接柱相邻的楼板在7度罕遇地震作用下保持弹性工作状态,能满足整体结构大震不倒的要求;采取搭接柱转换的结构竖向刚度均匀,没有形成软弱层;大底盘与塔楼交界处的剪力突变,应采取适当措施予以加强;裙房底部柱出现破坏,对此应采取适当加强措施。

In order to evaluate the seismic performance of a large podium-multi-tower complex high-rise structure with vertical overlapping column transfer block,a 1/15-scaled model shaking table test to simulate a 14-story two-tower structure with overlapping transfer column was conducted under a series of loading cases to study the failure mode and seismic performance of the whole structure,including frequently occurred intensity 7,basic intensity 7,rarely occurred intensity 7 and rarely occurred intensity 8.A numerically comparative study was done using the software MIDAS in this paper.The results show that the overlapping column transfer block as well as the adjacent slab can maintain elastic after the case of rarely occurred intensity 7 and can meet the requirement of collapse prevention under strong earthquakes.The structure with overlapping column has uniform vertical stiffness and does not have any soft story.Measures should be taken to strengthen the roof of the podium due to the abrupt change of shear force.The columns of the podium should be strengthened properly to aviod the column damages from the shaking table test.