非对称单索面独塔斜拉桥运营阶段安全性与稳定性分析OA

This study takes an asymmetric cable-stayed bridges with single cable plane,single tower and a main span of 165.0 m as the research object.A refined finite element model was established to systematically analyze its structural responses,safety and stability under various load combinations during the operation stage,using current bridge design codes as evaluation indicator.The analysis results are as follows.1)The lateral bending stiffness of the main tower is significantly lower than the vertical and lateral bending stiffness of the girder,making it the weakest part.Stability analysis further confirmed that out-of-plane leftward instability of the main tower governs the global structural stability as the most unfavorable mode.2)Under serviceability limit state,the most unfavorable horizontal displacement is 0.285 m,occurring at the tower top and manifesting as out-of-plane lateral bending of the tower.The girder exhibits relatively high vertical stiffness,with a maximum vertical displacement of merely 0.124 m during serviceability limit state,well below the code limit of L/400.3)Displace-ment response induced by seismic action is lower than that under serviceability limit state and thus does not govern.