大跨度悬索桥伸缩缝位移监测数据分析与评估

Analysis and assessment of the monitoring data of expansion joints for long-span suspension bridge

以南溪长江大桥120d的伸缩缝位移为对象,研究大跨度悬索桥伸缩缝的服役性能评价方法。首先,分析了伸缩缝位移与温度监测数据的相关性,在此基础上,采用高斯混合模型建立了伸缩缝位移的概率分布模型;其次,采用广义极值分布估计了设计基准期内伸缩缝位移的极大值和极小值;最后,对伸缩缝的运营性能进行了评价。研究结果表明,南溪长江大桥悬索桥伸缩缝位移与温度具有良好的负相关性;南溪长江大桥悬索桥的伸缩缝位移可以通过高斯混合分布模型来描述其概率分布;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,表明伸缩缝的运营性能满足设计要求。

With the monitoring data of expansion joint displacement of Nanxi Yangtze River Bridge in 120 days, the service performance evaluation for the bridge expansion joints is presented. First, the probability statistical analysis method for the expansion joint displace- ment is proposed, on the basis of probability distribution models of longitudinal displace- ment by Gauss mixture distribution model. Then, the maximum value and the minimum value of displacement expansion joint during service life are estimated by General Extreme Value. At last, the running performance of displacement expansion is evaluated. The results reveal that：①The displacement expansion joint of Nanxi Yangtze River Bridge has negative correlation with the temperature.②The expansion joint displacement of Nanxi Yangtze Riv- er Bridge can be described by the probability distribution through the Gaussian mixture dis- tribution model. ③The extreme displacement value with the action of annual variation of temperature is greatly less than the designed displacement, which indicates that the opera- tional requirement of expansion joint can satisfy the design requirement.