钢管混凝土独塔双索面斜拉桥稳定性分析  

Stability Analysis of Concrete Filled Steel Tube Cable-stayed Bridge with Single Tower and Double Cable Planes

作　　者：董军[1] 哈经纬 葛世超 李国华[1] 向学建 DONG Jun;HA Jingwei;GE Shichao;LI Guohua;XIANG Xuejian(Beijing Higher Institution Engineering Research Center of Structural Engineering and New Materials,Beijing University of Civil Engineering and Architecture,Beijing 102616,China;China-road Transportation Verification&Inspection Hi-tech Co.,Ltd.,Beijing 100082,China)

机构地区：[1]北京建筑大学工程结构与新材料北京市高等学校工程研究中心,北京102616 [2]中路高科交通检测检验认证有限公司,北京100082

出　　处：《施工技术（中英文）》2022年第9期60-64,69,共6页Construction Technology

基　　金：北京市自然科学基金(8142012);长江学者和创新团队发展计划(IRT_17R06);北京建筑大学教研项目(201802)。

摘　　要：以钢管混凝土独塔双索面斜拉桥——息县淮河大桥为工程背景,采用ABAQUS软件开展数值模拟分析,假设桥墩及0号块为刚体,斜拉索为刚度极高的实心钢材,索塔底部与桥墩及0号块固结,索塔底部x,y,z向均不产生位移及转动,建立钢管混凝土索塔有限元模型,对斜拉索安装过程中索塔应力和变形进行计算分析,并与实测数据进行对比,验证有限元模型的可靠性。研究结果表明,索塔底部钢管和核心混凝土应力均较大,即应力集中区域为索塔底部固结区域;索塔在斜拉索索力不断增加的情况下发生偏移变形,但不影响整个桥梁的稳定性;数值模拟得到的索塔应力、塔顶位移变化规律接近实际施工过程中的变化规律,可知模拟结果可靠、可信。为保证施工质量及结构安全,需在应力集中区域埋设应力传感器。Taking the Huaihe Bridge in Xixian as the engineering background,which is a concrete filled steel tube cable-stayed bridge with single tower and double cable planes.The numerical simulation analysis is carried out by using software ABAQUS.This paper assumes that the pier and zero block are rigid bodies,the stay cable is solid steel with high stiffness,the bottom of the bridge tower is consolidated with the pier and zero block,and there is no displacement and rotation at the bottom of the bridge tower in x,y and z directions,the finite element model of the concrete filled steel tubular cable tower is established.The stress and deformation of the cable tower during the installation of stay cable are calculated and analyzed,and compared with the measured data to verify the reliability of the finite element model.The research results show that the stress of steel pipe and core concrete at the bottom of the cable tower is large,that is,the stress concentration area is the consolidation area at the bottom of the cable tower.The cable tower is offset and deformed with the increasing cable force,but it does not affect the stability of the whole bridge.The numerical simulation of the variation law of the tower stress and the tower top displacement is close to the variation law in the actual construction process.It can be seen that the numerical simulation results are reliable and credible.In order to ensure the construction quality and structural safety,stress sensors need to be buried in the stress concentration area.

关 键 词：索塔 斜拉桥 钢管 混凝土 索力 稳定性 有限元分析 

分 类 号：TU318[建筑科学—结构工程]