高低墩连续刚构桥的动力特性与抗震分析  

Dynamic Characteristics and Anti-seismic Analysis of Continuous Rigid Frame Bridge with High and Low Piers

作　　者：程志友 钱骥[2,3] 陈鑫[2,3] 何进朝 CHENG Zhiyou;QIAN Ji;CHEN Xin;HE Jinchao(School of Shipping and Naval Architecture,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering, Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory Breading Base of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University,Chongqing 400074,China;Southwestern Hydraulic Institute for Waterways,Chongqing Jiaotong University, Chongqing 400016,China)

机构地区：[1]重庆交通大学航运与船舶工程学院,重庆400074 [2]重庆交通大学土木工程学院,重庆400074 [3]重庆交通大学山区桥梁与隧道工程国家重点实验室培育基地,重庆400074 [4]重庆交通大学西南水运工程科学研究所,重庆400016

出　　处：《铁道建筑》2018年第7期18-21,共4页Railway Engineering

基　　金：国家自然科学基金(51408090);重庆市基础与前沿研究计划(cstc2014jcyj A0947)

摘　　要：以云南山区一座高低墩连续刚构桥为例,基于自由振动的动力微分方程,采用有限元方法分析了高低墩(不对称)连续刚构与对称连续刚构的动力特性差异,通过线弹性时程方法分析了高低墩对连续刚构桥地震响应的影响特征,提出了高低墩连续刚构桥抗震设计要点。研究结果表明:对于高低墩连续刚构桥,内力极值主要出现在矮墩主梁根部和矮墩墩底;随着墩高的降低,矮墩墩底及其主梁根部所承受的内力急剧上升。Taking a continuous rigid frame bridge with high and low piers in Yunnan mountain area as an example,the finite element method was adopted to analyze the dynamic characteristics of(asymmetrical)continuous rigid frame bridge with high and low piers and symmetrical continuous rigid frame bridge based on dynamic differential equations offree vibration.The influence ofhigh and low piers on the seismic response ofcontinuous rigid frame bridge was analyzed based on linear elastic time history method,and the anti-seismic design points ofthe continuous rigid frame bridge with high and low piers were put forward.The results show that,for continuous rigid frame bridge with high and low piers,the peak value ofthe internal force mainly appears at the root ofthe girder and pier bottom ofthe low pier,and the internal forces ofwhich rise sharply with the pier height decreases.

关 键 词：连续刚构桥 动力特性 数值计算 动力微分方程 有限元 高低墩 抗震 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]