桥梁运营监测数据相关性分析及温度效应剔除

Correlation Analysis of Bridge Operation Monitoring Data and Rejection of Temperature Effect

近年来,桥梁事故频发,许多大型桥梁通过安装健康监测系统对其进行服役安全评定和寿命预测。为了能更好地利用桥梁健康监测数据,通过特征分析获取了温度、应变及挠度的基本特征,研究了结构温度与环境温度、结构应力以及结构挠度之间的相关性。将运营监测数据的组成分为荷载高频段和长波低频段,采用小波变换将二者进行分离,分别得到了由温度效应和外部荷载所引起的桥梁应力及挠度数据,结果表明:桥梁结构温度变化主要依赖于其所处的环境温度;主梁截面温度较桥墩截面温度在趋势上更符合环境温度的变化;主梁在纵桥方向上的不同位置具有一致的温度分布形式;温度对桥梁应力和挠度均具有较强的相关性;剔除温度效应得到的列车荷载作用下桥梁结构的响应结果更为精确,可为后续桥梁运营安全分析与评估提供科学数据和参考。

In recent years,with the frequent occurrence of bridge accidents,bridge health monitoring system has been installed for bridge service safety assessment and life prediction.To make better use of the bridge health monitoring data,the basic characteristics of temperature,strain and deflection were obtained through feature analysis.The correlation between structural temperature and ambient temperature,structural stress and structural deflection was studied.The composition of health monitoring data was divided into load high frequency band and long wave low frequency band.Wavelet transform was used to separate the two,and the bridge stress and deflection data caused by temperature effect and external load was respectively extracted.The results show that bridge structure temperature change mainly depends on the ambient temperature.The temperature of the main girder section is more in line with the change in the ambient temperature than the temperature of the pier section.The main girder has a consistent temperature distribution form at different positions in the longitudinal direction of the bridge.The temperature affects the stress and deflection of the bridge both have a strong correlation.Temperature has strong correlation with bridge stress and deflection.The response results of bridge structure under train load obtained by excluding temperature effect are more accurate,which can provide scientific data and reference for subsequent bridge operation safety analysis and evaluation.