巨型框架-次框桁架结构体系隔震减震性能研究

SEISMIC ISOLATION ANALYSIS OF MEGA-FRAME-SUB-TRUSS-FRAME SYSTEM

通过在巨型框架-次框桁架结构中增加隔震装置,得到巨型框架-次框桁架结构隔震减震体系。采用ANSYS有限元程序对该隔震减震体系进行了隔震减震动力时程计算,得到该结构体系在多条地震波作用下的地震响应。计算结果表明,巨型框架-次框桁架结构隔震减震体系是一种抗震性能良好的结构体系,可改善巨型结构的受力,具有优良的抗震性能:主、次框架顶点位移相对于巨型框架-次框桁架结构的顶点位移明显减小,主框架位移最大减少约47%,次框架最大减少约64%;主框架地震内力最大值响应低于巨型框架-次框桁架结构,剪力减少约33%,弯矩减少约34%。计算结果对巨型结构的抗震设计有较大的参考价值。

A new-style structural seismic isolation system is put forward by adding the isolation device into a mega-framesub-truss-frame system. The system＇s seismic response under several earthquake waves, such as the dynamic time history response, is obtained by using a general finite element program ANSYS to calculate the seismic isolation and resistance performance. The calculation results show that the mega-frame-sub-trnss-frame system is a well-behaved structural seismic system. It has good seismic resistance performance and improves the mega-frame＇ s load-carrying properties： The culmination displacements are reduced observably relative to the original structural system without the isolation device. The specific data are that the culmination displacement are reduced approximately by 47% in main-frame and by 64% in subframe. The maximum seismic internal force response value is also inferior to the original structural system. The shear force is reduced approximately by 33% and the bending moment is reduced by 34% . The calculation results have an important referential value to the seismic design of mega-frame structural system.