太平湖大桥二类稳定的风险分析

稳定是拱桥设计和施工过程中必须关注的关键性问题,而二类稳定能比较真实地反映拱桥的破坏历程,尤为重要。以主跨336 m的安徽太平湖大桥为背景,进行了其二类稳定的风险分析,详细介绍考虑和不考虑混凝土套箍效应的结构破坏历程,并讨论了计算模型精度对结构的影响,以及计算结构鲁棒性的问题,从而得到太平湖大桥二类稳定问题比较系统的结论。

Risk Analysis of Category 2 Stability of Taiping Lake Bridge

Stability of arch bridge is one of the key issues to which attention must be paid in the design and construction.The Category 2 stability(plastic buckling stability) thereof is particularly important because it can truly represent the history of failure of the bridge.In this paper,backgrounded by the Taiping Lake Bridge in Anhui,a concrete-filled steel tube arch bridge with a main span 336 m,the risk analysis of the Category 2 stability of the Bridge is made.The history of failure of the Bridge structure under situations that the concrete confinement effect is considered and is not considered is described in details,the influences of precision of calculation model on the structure and robustness of the calculated structure are discussed,and fairly systematic conclusions of the Category 2 stability of the Bridge have been obtained.