刚架拱桥破坏机理的分析

A Study of the Failure Mechanism of the Framed Arch Bridge

本文根据刚架拱桥结构的受力特性建立全桥及局部实体模型分析刚架拱桥的破坏机理,文中利用MIDAS/Civil模型,逐步减少模型中的横系梁,以考察横向联系的破坏对桥梁整体性的影响,研究表明由于微弯板产生的水平推力导致了横系梁的破坏,跨中截面和外弦杆破坏主要原因为截面高度不够。

Base on the framed arch bridge mechanical behavior, a solid model of batter brace by means of ANSYS program is established to analysis the Failure Mechanism of the Framed Arch Bridge. In order to do further research, using the MIDAS/Civil model, the number of lateral bracing is gradually reduced, and the influence of the lateral bracing on the global stiffness of the bridge is concluded, the reason of the disease of the lateral bracing has been found, that is the thrust produced by the micro--bend plate. And it has been found that the height of the the vault section and outer upper chard is not enough, which is the main reasons of the failure.