基于应变监测的独塔自锚悬索桥塔侧支撑反力识别  

Identification of Side Support Reaction of Single-pylon Self-anchored Suspension Bridge Based on Strain Monitoring

作　　者：陈一飞[1] 孙宗光[1] 季辉 郭保林 

机构地区：[1]大连海事大学辽宁省公路工程重点实验室,辽宁大连116026 [2]山东高速青岛公路有限公司,山东青岛266061

出　　处：《公路交通科技》2013年第4期60-64,共5页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(51178070);中央高校基本科研业务费项目(2012TD015);大连海事大学优秀科技创新团队培育计划项目(2012TD015)

摘　　要：基于监测应变,对胶州湾大桥的独塔自锚式悬索桥在不同施工阶段的塔侧支撑反力进行了识别。首先建立支撑结构的有限元模型,并根据主要监测点应变之间的协同关系,采用优化方法对有限元模型进行修正。然后,基于应变监测结果,针对钢箱梁吊装、吊杆张拉和临时支架拆除等各主要施工阶段,采用最小二乘法对塔侧支撑反力进行了识别,给出了历时1 a的动态反力值。所获得的识别结果表明,塔侧支撑结构的应变监测子系统较好地发挥了其应有的功能。基于应变监测的识别方法,能够较好地反映不同施工阶段的实际工况,可以对相关结构做出有效的识别和评价。在反力识别的基础上,结合吊杆、钢箱梁等其他部位的监测数据,可进一步实现对钢箱梁、吊杆的受力和工作状态的分析和评价。Based on strain monitoring, the identification of side support reaction of single-pylon self-anchored suspension bridge of Jiaozhou Bay Bridge in different construction stages is conducted. The finite element model of the support structure is developed at first, and the model is updated according to the coordinated relation among the monitored strains by adopting the optimization method. Then, based on the monitoring result of strain, pylon side support reactions are identified by using the least square method for construction stages of hoisting steel box girder, tensioning hangers and removing temporary supporters, and the dynamic reaction over a year is presented. The recognition result shows that （ 1 ） the strain monitoring subsystem of the pylon side support structure played its functions well; （2） strain monitoring-based identification method can better reflect the actual working conditions of different construction stages, and make effective identification and evaluation for the relevant structure; （3） based on the identified reaction force, the work for further analyzing and evaluation of steel box girder and hangers can be made by their monitoring data.

关 键 词：桥梁工程 悬索桥 模型修正 反力识别 应变监测 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]