中文摘要：

以苏通大桥斜拉桥347d的伸缩缝位移为对象，研究苏通大桥斜拉桥伸缩缝服役性能评价方法。首先提出了伸缩缝位移的概率统计分析方法，在此基础上验证了伸缩缝设计性能。其次，提出了伸缩缝位移与温度的相关性分析方法，在此基础上评价了伸缩缝使用性能。分析结果表明：①苏通大桥斜拉桥的伸缩缝位移可以通过2个正态分布函数的加权和来描述其概率分布，温度年变化作用下伸缩缝的极值位移远小于伸缩缝设计位移；②苏通大桥斜拉桥伸缩缝位移与温度具有良好的线性相关性，并且苏通大桥北端的伸缩缝存在性能退化的可能，需要积累更多的数据进行分析。

英文摘要：

With regard to the monitoring data of expansion joint displacement of Sutong Cable-stayed Bridge in 347 d, the evaluation method for the expansion joint service performance of the bridge is researched. First, the probability statistical analysis method for the expansion joint displacement is established, on the basis of which the design performance of the expansion joints is verified. Then, the correlation analysis method between the expansion joint displacement and temperature is established, on the basis of which the service performance of the expansion joints is evaluated. The analysis results reveal that （ 1 ） the expansion joint displacement of Sutong Cable-stayed Bridge can be described by the probability distribution through the weighted sum of 2 normal distribution functions, and the extreme value of the expansion joint displacement under annual temperature action is less than the design displacement; （2） the expansion joint displacement of Sutong Cable-stayed Bridge is highly linearly correlated with temperature. The end of the bridge exists the possibility further analysis. of performance degradation, which needs expansion joints in the north more data accumulation for