大跨径拱桥极限承载力

Ultimate bearing capacity of long-span arch bridge

针对大跨径拱桥具有比弹性理论方法计算出的结果高得多的承载力问题,在分析拱桥极限承载力常用方法的基础上,根据拱桥结构具有形成"四铰"所必须的塑性条件,在达到四铰破坏以前,结构满足纵向和横向的压屈稳定条件,拱轴截面受压区极限应力图形可换算为矩形应力图形等基本假定,以四铰破坏为条件,推导出逐次逼近法计算大跨径拱桥的承载力计算公式,为大跨径拱桥的设计与施工提供了一定的理论依据。

The long-span arched bridge has much higher loading than that computed with the flexibility theory method. The common methods to analyze the ultimate bearing capacity was discussed. According to the plastic condition of arched bridge structure during the development of four-hinged failure, its lateral deflection stabilizing condition that in longitudinal direction was studied.The formulae to compute the ultimate bearing capacity of the long-span arched bridge were presented, which provide some theory references to the design and construction of bridge.