（中建科技有限公司深圳分公司， 深圳 518052）

［摘要］采用数值模拟分析方法，对采用交错桁架结构体系的工程实例进行多遇地震和罕遇地震下的整体受力分析，探讨其抗连续倒塌性能特点。计算结果表明：结构平面布置规则、竖向刚度均匀时，在多遇地震作用下，层间变形较小，各项指标均满足规范要求；罕遇地震作用下，结构最大层间位移角小于规范限值，可实现“大震不倒”的抗震性能要求；交错桁架结构体系的水平及竖向关键构件失稳后，结构端部桁架杆件虽然屈服，但未发生整体稳定性破坏，结构不会发生跨塌；柱发生破坏时，柱端纵梁及桁架形成转换梁效应，将上部柱传递下来的荷载进行重分配，结构不会发生连续性倒塌。

［关键词］交错桁架； 关键构件； 整体稳定； 动力性能； 抗连续性倒塌

中图分类号：TU318文献标识码：A文章编号：1002-848X(2020)07-0037-07

Dynamic performance analysis of a staggered truss structural system

SUN Zhanqi, WANG Hongxin, WANG Qinghua, LI Xiaoli, WANG Ning, QIU Yong

(China Construction Science & Technology Group Co., Ltd., Shenzhen 518052, China）

Abstract:The method of numerical simulation analysis was used to analyze the overall mechanism of staggered truss structural system under frequent and rare earthquakes, and the characteristics of its resistance to progressive collapse were discussed. The calculation results show that when the structure is arranged in a regular plane and the vertical stiffness is uniform, under the action of frequent earthquakes, the interlayer deformation is small and all indicators meet the requirements of the code. Under the rare earthquake, the maximum interlayer displacement angle of the structure is less than the specification limit value, which can achieve the seismic performance requirement of “not collapsing under the rare earthquakes”. After the horizontal and vertical key members of the staggered truss structural system are destabilized, although the truss members at the end of the structure have yielded, the overall stability failure has not occurred and the structure is not collapse. When the column is damaged, the longitudinal beams and trusses at the end of the column form the transition beam effect, which redistributes the loads transferred from the upper columns, and there is no progressive collapse for the structure.

Keywords:staggered truss; key member; overall stability; dynamic performance; anti-progressive collapse

*十三五国家重点研发计划项目（2016YFC0701500，2017YFC0703609）。

作者简介：孙占琦，学士，教授级高级工程师，一级注册结构工程师，Email: sun.zhq@cscec.com。