环境温度对连续刚构桥模态频率的影响  

Effects of Environmental Temperature on Modal Frequency of Continuous Rigid Frame Bridge

作　　者：余印根[1] 宗周红[2] 陈宝春[1] 夏樟华[1] 

机构地区：[1]福州大学土木工程学院福州,350108 [2]东南大学土木工程学院南京,210096

出　　处：《振动．测试与诊断》2014年第1期69-76,190,共8页Journal of Vibration,Measurement & Diagnosis

基　　金：国家自然科学基金资助项目(51178101)

摘　　要：针对环境温度对大跨度预应力钢筋混凝土连续刚构桥的频率影响问题,通过下白石大桥健康监测系统的温度和模态频率数据统计分析,建立了该桥环境温度与模态频率的三元线性回归模型。检验结果表明,该模型具有较好的拟合和预测精度,可对桥梁后续的模态频率数据进行预测评判。基于该回归模型,提出了下白石连续刚构桥梁模态频率的温度修正模型,可以有效剔除环境温度对模态频率的影响,使频率变化趋于平稳,为桥梁进一步的安全性评估、损伤诊断和桥梁模型修正等提供温度修正的模态频率数据。Aimed at the problem that the modal frequency of large span continuous pre-stressed rigid frame bridge is always influenced by environmental temperature,a statistical analysis with modal frequency and temperature is performed on the Xiabaishi bridge′s health monitoring data.The ternary linear regression model between the environmental temperature and the modal frequency of this bridge is proposed,which has been verified to show a relatively high precision in fitting and prediction.And it can be used to predict and evaluate modal frequency data in the future.Furthermore,the temperature correctional model about modal frequency of Xiabaishi continuous rigid-framed bridge is presented.The model can effectively eliminate the effect of environmental temperature on the modal frequency,and make the frequency tend to be stabilized.It can provide temperature correction modal frequency data for the bridge health monitoring analyses,such as safety and durability evaluation,damage detection,updated finite element model,etc.

关 键 词：连续刚构桥 桥梁健康监测 模态频率 环境温度 数理统计 

分 类 号：U446[建筑科学—桥梁与隧道工程] U448.23[交通运输工程—道路与铁道工程]