Abstract

Bridges in service may experience accidental actions, which may alter their structural integrity. Bracing systems are provided along the arch to reduce the risk of damage or failure. In this work, the post-buckling response of a generic network arch bridge has been investigated throughout an intensive finite element analysis. Initially, a buckling analysis was carried out on the steel bridge to find out the critical live loads underlining the influence of the geometrical non-linearity of the arch on the critical overload. Then, the description of the out-of-plane structural response of the steel arches under vertical loads was presented and finally, the lateral capacity of the arch after the accidental cable loss scenario was investigated. As a result of these studies, some interesting observations were made. The critical live loads are strongly influenced by the geometrical nonlinearity of the steel arch. Besides, the non-braced arch bridges exhibit the out-of-plane behaviour identical to that of an isolated arch.

摘要

使用中的桥梁可能会遇到意外动作，这可能会改变其结构完整性。沿拱门提供支撑系统以降低损坏或故障的风险。在这项工作中，通过密集的有限元分析研究了通用网络拱桥的屈曲后响应。最初，对钢桥进行了屈曲分析，以找出强调拱的几何非线性对临界过载的影响的临界活荷载。然后，描述了钢拱在竖向荷载下的平面外结构响应，最后，研究了意外电缆损失情景后拱的横向承载力。作为这些研究的结果，进行了一些有趣的观察。临界活荷载受钢拱的几何非线性影响很大。此外，无支撑拱桥表现出与孤立拱相同的平面外行为。