汶川地震中小半径曲线连续梁桥震害机理分析

Analysis of damage mechanism of small radius curve continuous beam bridges during the Wenchuan Earthquake

汶川地震中,小半径曲线连续梁桥遭受了不同程度的震害。本文针对其中震害严重的小黄沟中桥,进行了地震反应分析,讨论了其震害机理,研究了不同的下部结构形式以及固定墩上下部结构不同的连接方式对该类桥梁抗震性能的影响,提出了提高小半径曲线连续梁桥抗震能力的对策建议。

During the Wenchuan earthquake,many small radius curve continuous beam bridges were damaged on varying degrees. Earthquake response analysis for the Xiaohuanggou Bridge,which was damaged seriously,was made in this paper,and earthquake damage mechanism was discussed. Different seismic performance for different substructure and different connection type on fixed piers were studied. A new method uses proper constructional measure to change the transmission of earthquake energy,reduce the relative displacement between superstructure and substructure,assure the safety of substructure,to avoid earthquake damage.