考虑多因素影响的板式橡胶支座桥梁主梁支承长度计算方法研究  

Study on calculation method of main girder support length of laminated rubber bearing bridge considering multiple factors

作　　者：李雪红[1] 李洪刚 佘振扬 张赵铨 严玲欣 刘朵 徐秀丽[1] Li Xue-hong;Li Hong-gang;She Zhen-yang;Zhang Zhao-quan;Yan Lin-xing;Liu Duo;Xu Xiu-i(College of Civil Engineering,Nanjing Tech University,Nanjing 211816,China;Jiangsu Ningsuxu Expressway Co.Ltd,Suqian 223800,China;JSTI GR0UP,Nanjing 210000,China)

机构地区：[1]南京工业大学土木工程学院,江苏南京211816 [2]江苏宁宿徐高速公路有限公司,江苏宿迁223800 [3]苏交科集团股份有限公司,江苏南京210000

出　　处：《工程抗震与加固改造》2023年第5期122-131,共10页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金项目(51778289);国家自然科学基金项目(52178486);山东省交通运输科技计划项目(2019B33)。

摘　　要：为了研究板式橡胶支座桥梁抗震支承长度的需求,针对典型公路混凝土梁桥,考虑强震作用下板式橡胶支座的滑动效应、工程场地类别、抗震设防烈度、曲率半径的影响,分析了地震作用下墩梁相对位移峰值的变化规律,建立了桥梁结构不同基本周期时墩梁相对位移的包络图,提出曲线梁桥墩梁相对位移放大系数建议值;考虑主梁的二次跌落效应、板式支座倾覆稳定性的影响,提出了考虑多种影响因素的板式橡胶支座桥梁主梁支承长度的计算方法,并与各国抗震规范进行对比,分析了所提计算方法的合理性。该计算方法可以对桥梁抗震支承长度的设计起到一定的参考作用。In order to study the demand of seismic support length of laminated rubber bearing bridge,aiming at typical highway concrete beam bridge,considering the influence of sliding effect of laminated rubber bearing,engineering site category,seismic fortification intensity and curvature radius under strong earthquake,the variation law of relative displacement peak value of the pier and beam under earthquake is analyzed,the envelope diagram of the relative displacement of the pier and beam under different natural vibration periods of the bridge structure is established,and the recommended value of the relative displacement amplification coefficient of the pier and beam of the curved beam is proposed.Considering the secondary drop effect of the main beam and the overturning stability of laminated rubber bearings,the calculation method of the main beam supporting length of the plate rubber bearing bridge considering various influencing factors is proposed and compared with the seismic codes of various countries,and the rationality of the proposed calculation method is analyzed.This calculation method can be used as a reference for the design of seismic support length of bridges.

关 键 词：板式橡胶支座 抗震支承长度 滑动效应 二次跌落 支座稳定性 曲率半径 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]