竖向地震动对设有FPS支座斜交桥的影响  

Effect of Skewed Bridge with FPS Bearing Under Vertical Earthquake

作　　者：沈佳伟[1] 王志强[1] 魏红一[1] 张旸[1] 

机构地区：[1]同济大学桥梁工程系,上海200092

出　　处：《石家庄铁道大学学报（自然科学版）》2016年第1期6-12,共7页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：以一座设有FPS支座的斜交桥为原型,基于SAP2000建立了动力分析模型,研究了当地震波三维输入时,不同竖向地震动对FPS支座及下部结构地震响应的影响,又考虑边界碰撞因素,研究碰撞对结构响应的影响。结果表明:竖向地震动对FPS支座水平剪力与位移有一定影响,对下部结构的轴力和扭矩的影响很大;在SAP2000中采用Plastic(Wen)单元能很好地估计FPS支座位移值,但低估了FPS支座剪力值;当考虑碰撞效应时,支座地震响应将急剧增大;碰撞是导致上部结构旋转的首要原因。A model of a skewed bridge with FPS bearing was built using SAP2000. Pounding was taken into consideration to study its effect to the structure. Effects of FPS bearing and substructure under various vertical earthquakes were studied. The result indicated that vertical earthquake changed horizontal shear force and displacement of FPS bearing and influenced axial force and torsion moment greatly; while Element Plastic（Wen） in SAP2000 simulated FPS bearing well, it underestimated shear force of bearing; earthquake response of FPS bearing increased rapidly with consideration of pounding effect; and pounding effect was the main reason why superstructure rotated.

关 键 词：斜交桥 FPS支座 碰撞 隔震 竖向地震 

分 类 号：U442.59[建筑科学—桥梁与隧道工程]