FPS抗震支座分析模型的比较研究

COMPARISON STUDY ON ANALYSIS MODELS OF FPS SEISMIC ISOLATION SUPPORT

简单回顾了FPS抗震支座的基本原理,探讨了FPS支座在公路和铁路桥梁抗震中的应用。重点讨论了FPS支座的两种分析模型:Bouc-Wen模型和考虑动轴力和双方向耦合的FP模型,基于考虑动轴力、双方向耦合与否、及采用不同摩擦力学模型使结构地震反应产生的差异,提出了FPS支座合理抗震计算模型选取时应注意的问题。并针对近年来FPS抗震支座应用情况,提出了设计参数的选取原则。

The basic principle of a frictional pendulum system(FPS) is reviewed. And some important problems of designing and applying FPS in bridge seismic isolation are discussed herein. Two main mechanical models to simulate FPS, Bouc—Wen model and FP model used in dynamic time-history response analysis, are introduced. The differences between their seismic responses, caused by considering or not the dynamic axial force or biaxial coupling effect and using different friction models, are discussed. Some useful suggestions are given for choosing reasonable modeling methods and parameters.