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拱桥在我国有着悠久的历史。近年来,拱桥倒塌事故频发,引起科研及工程人员的广泛关注。该文以某实际钢筋混凝土刚架拱桥倒塌事故为例,建立相应的非线性有限元模型。首先,针对桥墩底部不同的约束情况,设置了两种工况,并分别对因超载导致的拱桥连续倒塌过程进行分析。其次,采用基于广义刚度的构件重要性评价方法对该桥梁的构件重要性进行分析,分析结果表明刚架拱的斜撑以及斜撑与水平构件连接的部位是重要性系数较高的部位,该分析结果与倒塌模拟过程一致。
Arch bridge in our country has a long history. In recent years, frequent collapse of arch bridges, causing widespread concern of scientific research and engineering staff. Taking the collapse of an actual reinforced concrete frame arch bridge as an example, a nonlinear finite element model is established. First of all, according to the different constraint conditions at the bottom of piers, two conditions are set up and the successive collapse process of arch bridges caused by overloading is analyzed respectively. Secondly, the importance of members of the bridge is analyzed based on the importance evaluation of the members based on the generalized stiffness. The analysis results show that the bracing of the rigid frame arch and the connection between the bracing and the horizontal members are the parts of high importance. The analysis results are consistent with the collapse simulation.