不同墩高双薄壁墩连续刚构桥地震响应研究  

Study on seismic response of continuous rigid frame bridge with double piers of different pier heights

作　　者：宋帅 王帅[1] 吴刚 Song Shuai;Wang Shuai;Wu Gang(School of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024 [2]华东交通大学土木建筑学院,江西南昌330013

出　　处：《工程抗震与加固改造》2020年第2期107-112,共6页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金(51808376)。

摘　　要：为定量研究墩高对双薄壁墩连续刚构桥地震响应的影响,建立了4座不同墩高的桥梁有限元模型,基于特征值分析和增量动力分析得到结构动力特性和结构非线性动力响应。结果表明:4座桥梁的一阶周期远大于其他阶周期,其基本周期随桥梁墩高增加而明显增大;桥梁纵横向位移在墩高20~60 m范围内随墩高增加逐渐增大,抗震性能逐渐提升;墩高80 m桥梁的纵向位移小于墩高60 m桥梁,其桥墩纵向位移沿墩身明显呈反"S"型增加;桥梁中墩较边墩更易遭受破坏,墩底较墩顶更易遭受破坏。To quantify the impact of pier height on the seismic response of double-thin-walled continuous rigid frame bridges,finite element models of four bridges with different pier heights are established.Based on eigenvalue analysis and incremental dynamic analysis,the structural dynamic characteristics and nonlinear dynamic responses are obtained.The results show that the first order vibration periods of the four bridges are much larger than other order periods,and the basic periods increase obviously with the increase of pier height.The longitudinal and lateral displacement of the bridges increases gradually with the increase of pier height in the range of 20~60 m,and the seismic performance improves gradually with the increase of pier height.The longitudinal displacement of the bridge with the pier height of 80 m is smaller than that of the bridge with the pier height of 60 m.The longitudinal displacement of the pier along the pier is in an inverse"S"shape.The middle piers of the bridges are more vulnerable than the side piers,and the bottom of the pier is more vulnerable than the top of the pier.

关 键 词：刚构桥 双薄壁墩 地震响应 弹塑性时程分析 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]