不同支座对异形斜交梁桥减隔震性能的影响研究  

Study on the Influence of Different Supports on Vibration Isolation Performance of Special-shaped Skew Beam Bridge

作　　者：曹锋[1] 马鹏 靳威燕 CAO Feng;MA Peng;JIN Weiyan(School of Civil and Transportation Engineering,Qinghai Nationalities University, Xining 810007,China;CSCEC AECOM Consultants Co., Ltd., Lanzhou 730000,China)

机构地区：[1]青海民族大学土木与交通工程学院,青海西宁810007 [2]中国市政工程西北设计研究院有限公司,甘肃兰州730000

出　　处：《佳木斯大学学报（自然科学版）》2021年第2期37-41,共5页Journal of Jiamusi University：Natural Science Edition

基　　金：青海民族大学校级规划一般项目(2020XJGH07)。

摘　　要：随着城市桥梁发展,城市立交匝道上异形梁斜交梁桥大量增加,对于高烈度地区异形斜交连续梁桥减隔震的问题,以甘肃(天水)国际陆港城陆港大道上异形斜交梁桥为研究对象,采用非线性时程分析方法,研究异形斜交梁桥采用普通橡胶支座、超高阻尼SHDR支座和摩擦摆FPQZ支座的地震反应。结果表明:异性斜交桥梁结构采用FPQZ支座,结构前三阶自振周期增大最大,FPQZ支座在增大周期方面比SHDR支座效果更好;采用SHDR支座,固定墩和活动墩纵横向墩底内力随入射角的变化幅度较FPQZ支座小,且SHDR支座左右墩受力更均匀,对全桥的受力更为有利;异形中墩斜交梁地震作用下墩底内力和位移受地震波入射角的影响较大,工程设计中应充分考虑地震波入射角的影响,采用普通支座和减隔震支座时最大最小内力发生入射角也不相同,设计时应考虑。With the development of urban bridges,there has been a large increase in irregularly-shaped oblique beam bridges on urban overpass ramps.For the problem of seismic isolation and isolation of irregularly-shaped oblique continuous beam bridges in high-intensity areas,the special-shaped oblique beam on Lugang Avenue in the International Land Port City Cross-beam bridge is the research object,and nonlinear time-history analysis method is used to study the seismic response of special-shaped oblique cross-beam bridge with ordinary rubber bearings,super-high damping SHDR bearings and friction pendulum FPQZ bearings.The results show that the structure of heterogeneous skew bridge adopts FPQZ bearing,and the first three-order natural vibration period of the structure increases the most.FPQZ bearing has better effect than SHDR bearing in increasing period,SHDR bearing,fixed pier and movable pier are adopted.The variation amplitude of the vertical and horizontal pier bottom internal force with the incident angle is smaller than that of the FPQZ support,and the force on the left and right piers of the SHDR support is more uniform,which is more beneficial to the force of the whole bridge.And the displacement is greatly affected by the incident angle of the seismic wave.The influence of the incident angle of the seismic wave should be fully considered in the engineering design.The maximum and minimum internal force incidence angles are different when the ordinary support and the seismic isolation support are used,and should be considered in the design.

关 键 词：地震波入射角 异形斜交连续梁桥 SHDR支座 FPQZ支座 减隔震分析 

分 类 号：U442.5[建筑科学—桥梁与隧道工程]