基于监测数据的钢桁悬索桥梁端位移特性研究  

Study on Girder End Displacement Characteristics of Steel Truss Suspension Bridge Based on Measurement Data

作　　者：黄国平[1,2] 胡建华 崔剑峰[4] 孙秀贵 宋枭鹏 HUANG Guo-ping;HU Jian-hua;CUI Jian-feng;SUN Xiu-gui;SONG Xiao-peng(School of Civil Engineering,Hunan City University,Yiyang Hunan 413000,China;School of Civil Engineering,Hunan University,Changsha Hunan 410082,China;Hunan Communications&Water Conservancy Group Co.,Ltd.,Changsha Hunan 410008,China;Hunan Provincial Communications Planning Survey&Design Institute Co.,Ltd.,Changsha Hunan 410200,China)

机构地区：[1]湖南城市学院土木工程学院,湖南益阳413000 [2]湖南大学土木工程学院,湖南长沙410082 [3]湖南省交通水利建设集团有限公司,湖南长沙410008 [4]湖南省交通规划勘察设计院有限公司,湖南长沙410200

出　　处：《公路交通科技》2022年第5期65-73,共9页Journal of Highway and Transportation Research and Development

基　　金：湖南省自然科学基金项目(2021JJ50143,2021JJ50153);湖南省科技人才托举工程项目(2019TJ-Y08);湖南省教育厅资助科研项目(21B0713,21C0680,18A401);湖南省企业科技创新创业团队支持计划项目。

摘　　要：梁端位移直接影响梁端伸缩缝、支座及梁端阻尼器等附属装置的工作状态。为了揭示大跨钢桁悬索桥梁端位移响应特性及其规律,以矮寨大桥为工程依托,在其梁端设置位移传感器及温度传感器,建立了梁端位移长期监测系统,基于450 d监测实测数据,分析了运营条件下大跨钢桁悬索桥梁端位移时域及频域特性。在此基础之上,研究了温度与梁端纵向位移间的相关性,统计了梁端振动循环次数和梁端纵向累计位移。最后分析了梁端纵向累计成分构成并量化了各成分比例。结果表明:悬索桥的梁端位移包含了温度变化激发的长周期成分和车辆以及环境激励激发的短周期成分;梁端位移随温度季节周期性与昼夜周期性影响变化,梁体平均温度与梁端纵向位移RMS值有良好的线性相关性;而车辆导致的梁端位移响应分为车致强迫拟静态效应和车致动态效应两部分。矮寨桥两端平均每天纵向累计位移分别为130 m,152 m,其中车致梁端动态纵向位移是主要来源(约为80%),温度变化导致的梁端位移对累计位移的贡献相对较小(不到1%)。大跨度钢桁悬索桥梁端位移响应特性总体与大跨度钢箱梁悬索桥大致相似,但其梁端累计位移量值较大跨度钢箱梁悬索桥的累计位移量值要大,加劲梁形式不同可能是造成该累计位移差异原因之一。The girder end displacement directly affects the working state of the auxiliary devices such as expansion joint, support and damper at girder end. To reveal the girder end displacement characteristics and the rule of long-span steel truss suspension bridge, based on the project of Aizhai Bridge, displacement sensors and temperature sensors are installed at the girder ends, and a long-term monitoring system for girder end displacement is established. Based on the 450 d monitoring data, the time-domain and frequency-domain characteristics of the girder end displacement of long-span steel truss suspension bridge under operating conditions are analysed. On this basis, the correlation between temperature and girder end longitudinal displacement is examined, and the number of vibration cycles and the longitudinal cumulative displacement of girder end are counted. Finally, the longitudinal cumulative component composition of the girder end is analyzed and the proportion of each component is quantified. The result shows that(1) the girder end displacement includes the long-period components due to temperature variation and the short-period components due to vehicle dynamic effect and ambient excitation;(2) the girder end displacement varies with seasonal and circadian temperature periodicity, and the mean temperature and RMS response of girder end longitudinal displacement exhibit good linear correlation;(3) the girder end displacement response caused by vehicle can be divided into quasi-static effect and dynamic effect caused by vehicle;(4) the average daily cumulative longitudinal displacement of the both sides of Aizhai Bridge is 130 m and 152 m respectively, most of them are made up of dynamic longitudinal displacement caused by vehicle(about 80%), while the displacement due to the temperature variation plays a relatively little role in the cumulative displacement(less than 1%);(5) the girder end displacement response characteristics of long-span steel truss suspension bridge are generally similar to those of long-sp

关 键 词：桥梁工程 悬索桥 监测 频谱分析 梁端位移 特性 

分 类 号：U446.2[建筑科学—桥梁与隧道工程]