车辆荷载下长山大桥斜拉索以及塔梁墩连接处疲劳分析

Fatigue life analysis for stay cables and the consolidation of the tower girder and pier of Changshan bridge under the vehicle load

根据S-N曲线和线性累积疲劳损伤准则等对长山大桥斜拉索进行车载下疲劳分析和寿命评估.利用ANSYS编制程序绘制塔梁墩固结处的位移影响线,找出荷载最不利位置,然后,结合疲劳分析软件FE-SAFE计算塔梁墩固结处的疲劳寿命.分析结果表明,长山大桥塔梁墩固结处在车辆荷载反复作用下最容易发生疲劳破坏,其内索区斜拉索在车辆荷载反复作用下寿命要低于边索区,这为长山大桥日后检修维护等工作提供了一定依据.

The fatigue analysis and life evaluation of Changs- han cable stayed bridge under vehicle loads were completed according to the S-N curve and linear cumulative damage rule. The influence line of displacement of fixed pier-pylon- beam was drawn by using ANSYS to find out the most disad- vantageous load position, and the fatigue life of fixed pier-py- lon-beam was calculated by combining the result with the fatigue analysis software FE-SAFE. Results show that fixed pier-pylon-beam of Changshan bridge is prone to fatigue failure, the fatigue life of internal rope zone of the bridge is lower than the edge cable, which provides a reference for future ma- intenance of Changshan bridge.