环境温度对斜拉桥动力特性的影响分析

基于东海大桥主航道斜拉桥健康监测系统测得的一年的环境温度和结构响应的数据分析了环境温度对结构动力特性的影响。首先基于环境温度的监测数据对环境温度的分布特点进行了分析，环境温度沿桥梁纵向具有很强的一致性，沿箱梁截面具有明显的温度梯度。接着分析环境温度对结构动力特性的影响机理，并通过实际监测数据进行了验证，其结果表明理论分析与实际监测数据具有很好的一致性。最后基于ARX模型对于环境温度对结构动力特性影响的惯性效应进行了分析，表明环境温度的影响具有明显的时间滞后效应，同时基于多点温度能够等效表示环境温度的惯性效应。

Effect Analysis of Environmental Temperature on Dynamic Properties of Cable stayed Bridge

Based on one year monitoring data measured by structural health monitoring system of Donghai Bridge, environmental temperature effect on dynamic properties of the main navigation channel cable-stayed bridge was analyzed. At first, the distribution characteristics of environmental temperature were analyzed based on the monitoring data of environmental temperature. Environmental temperature was uniformly distributed along the longitudinal direction of bridge and there was also significant temperature gradient in the cross section of the box girder. The influencing mechanism of environmental temperature on dynamic properties was theoretical analyzed and was validated by the monitoring data. The results demonstrated that the theoretical analysis was consistent with the monitoring data. Finally the environmental temperature inertial effect on dynamic properties was analyzed based on ARX (Auto-Regressive model with eXogenous inputs) model. The results showed that there was time-lag effect of temperature on dynamic properties and the time-lag effect could be equivalently evaluated by multi-point temperature data.