摘要
大跨斜拉桥支座病害对结构受力影响较大,需对其进行更换处理.为保证马桑溪长江大桥主桥支座更换过程中结构的安全性,基于ABAQUS建立垫石实体模型,验算其承载能力,同时利用Midas Civil软件建立全桥有限元模型,计算支座顶升的顶升力、顶升过程中梁体应力及索力的变化,并分析伸缩缝对支座更换的影响.结合施工监控的结果表明更换支座过程中主梁应力和索力变化均较小,结构安全储备较高.在顶升过程中,支座垫石安全可靠,但未解除伸缩缝约束会增加顶升难度,造成顶升失败,因而更换支座前先将桥面约束解除.
The bearing defects of long-span cable-stayed bridges have a great impact on the structural forces and need to be replaced.In order to ensure the safety of the structure during the replacement of the main bridge of the Masangxi Yangtze River Bridge,a solid model of the cushion stone was established based on ABAQUS and its bearing capacity was checked.At the same time,Midas Civil software was used to establish a full bridge finite element model to calculate the jacking force of the support,the changes in beam stress and cable force during the jacking process,and to analyze the impact of expansion joints on the replacement of the support.Combined with the results of construction monitoring,the changes in the stress and cable force of the main girder during the bearing replacement process are small,and the structural safety reserve is relatively high.During the jacking process,the support cushions are safe and reliable,but failure to lift the expansion joints will increase the difficulty of jacking and cause jacking failure.Therefore,the bridge deck constraint should be released before replacing the bearing.
作者
杨明
陈畅
王宗山
张向和
YANG Ming;CHEN Chang;WANG Zongshan;ZHANG Xianghe(School of Civil Engineering, Chongqing Jiaotong University,Chongqing 400074,China;Chongqing Municipal Facilities Administration,Chongqing 400015,China)
出处
《徐州工程学院学报（自然科学版）》
CAS
2021年第4期86-92,共7页
Journal of Xuzhou Institute of Technology(Natural Sciences Edition)
基金
国家自然科学基金项目(51908093)
重庆市教委科技项目(KJQN201900733)
湖北省交通运输厅科技项目(2020-2-1-1)
重庆市技术创新与应用发展专项重点项目(cstc2019jscx-gksbX0047)。
关键词
斜拉桥
支座更换
有限元法
内力分析
施工监控
cable-stayed bridge
bearing replacement
finite element method
internal force analysis
construction monitoring
