两跨连续梁模型桥地震响应影响因素研究  

Influence Factors in Seismic Response of Two-span Continuous Bridge Model

作　　者：黎雅乐 杨丙文 宗周红[3] LI Yale;YANG Bingwen;ZONG Zhouhong(College of Civil Engineering,Jiangsu Open Univ.,Nanjing 210036,China;College of Road,Bridge,Port and Navigation Engineering,Nanjing Communications Institute of Technology,Nanjing 211188,China;College of Civil Engineering,Southeast Univ.,Nanjing 210096,China)

机构地区：[1]江苏开放大学建筑工程学院,南京210036 [2]南京交通职业技术学院路桥与港航工程学院,南京211188 [3]东南大学土木工程学院,南京210096

出　　处：《三峡大学学报（自然科学版）》2020年第5期49-54,共6页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金面上项目(51678141);江苏省建设厅科技项目(2019ZD024)。

摘　　要：以公路钢筋混凝土连续T梁桥为背景,结合振动台试验所用两跨连续梁模型桥地震响应,开展跨径、跨数、斜交角对该模型桥地震响应影响的数值研究,结果表明:在纵向地震输入时,跨径增加,支座水平剪力越大,墩梁纵向相对位移越大;跨数越多,支座和桥墩受力越大,远离固定墩侧的墩梁相对位移提高;斜交角增大,支座和桥墩受力由单向变为双向,纵向地震响应降低而横向地震响应不断增长;跨数和跨径增大时,主梁加速度响应的变化与地震动特性有关,而斜交角增大则纵向加速度不断减小.To study the seismic response of highway reinforced concrete continuous girder bridge,a two-span continuous beam model bridge is tested in shaking table.Corresponding numerical simulations are conducted to study the influences of span,number of span,and skew angle on seismic response of the modelling test.The results show that span increases when vertical seismic input is achieved.The larger horizontal shear force of abutment is,the larger relative displacement of pier beam longitudinal displacement is.More cross numbers cause larger force of bearing and pier force,and larger relative displacement of pier beam far away from fixed pier side.With the increase of the skew angle,the force of the bearing and pier changes from one-way to two-way,and the longitudinal seismic response decreases while the transverse seismic response increases.When the number of spans and spans increase,the change of the acceleration response of the girder is related to the characteristics of ground motion,while the longitudinal acceleration decreases with the increase of skew angle.

关 键 词：连续梁桥 地震响应 影响因素 跨径 跨数 斜交角 

分 类 号：U448.21[建筑科学—桥梁与隧道工程]