强震下巨子型结构体系的扭转效应分析

Study on the torsional effects of mega sub structure system under seismic loads

探讨了巨子型结构体系的工作原理及特点。以某结构方案为例,采用大型通用有限元分析软件对巨子型结构体系和普通巨型框架结构建立了空间相互作用模式下的杆系模型,用三维空间梁单元模拟梁、柱及支撑,用壳单元模拟楼板,选用实测地震波来进行时程分析,然后对两种结构的扭转效应进行对比研究。结果表明,巨子型结构体系对主结构和子结构的扭转效应均有显著的控制效果。结论:巨子型结构体系可以有效控制地震作用时的扭转效应。

This paper describes the working principle and characteristics of the mega sub structure system.In an engineering example,it uses large common finite element analysis software to establish the rods model under the spatial interaction model for the mega sub structure system and conventional mega-frame structure.It use three-dimensional beam element to imitate beams,columns and braces,and shell element to imitate floor.Choosing a measured seismic waves to do time-history analysis,and then compare the torsional effects of two kinds of the structures.The results show that,mega sub structure system has remarkable control effects to the torsional effects of the mega structure and sub structure.Conclusion：mega sub structure can reduce the torsional effects effectively under seismic loads.