考虑初始位移的串联隔震体系竖向承载力有限元分析

在实际工程中,叠层橡胶支座由于某些原因会产生初始变形,这对结构的安全性产生影响。该文以方形叠层橡胶支座和钢筋混凝土(RC)柱组成的串联隔震体系为研究对象,用有限元软件MARC对有初始位移的串联隔震体系进行偏压的分析。对比4种模型3种工况下水平变形和竖向变形,根据变形特点给出4种模型3种工况的竖向极限承载力,分析叠层橡胶支座与RC柱的线刚度比和初始位移对串联隔震体系竖向承载力的影响。

Finite element analysis of vertical loading capacity of serial seismic isolation system with the initial displacement

The initial displacement which the laminated rubber bearing in some condition occurs has some influence on the structural safety in practice.Taking the serial seismic isolation system,which consists of square laminated rubber bearing mounted on top of reinforcement concrete column,as the investigated subject,the paper conducts the finite element analysis for the serial isolation system with initial displacement,compares the horizontal and vertical displacement of the four models under three conditions,and give the vertical loading capacities,respectively,and analyzes the effect of the ratio of stiffness of the laminated rubber bearing and reinforcement concrete column and initial displacement for the vertical loading capacities of the serial isolation system.