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针对连续梁桥和单塔斜拉桥2种桥型,提出了基于极限分析理论的桥梁倒塌模式识别方法。首先建立以破坏点位置和位移为参数的单塔斜拉桥及连续梁桥的倒塌模型,运用极限分析理论求解导致桥梁部分或整体倒塌所必须包含的破坏点及其破坏形式,并得到极限承载力。与有限元计算方法的比较可知,该方法可用于桥梁概念设计阶段,以快速识别桥梁倒塌模式,计算结构极限承载能力。且计算结果可为正确评估桥梁抗倒塌能力,建立抗灾设计理念,采取有效的减灾措施提供科学依据。
Aiming at the two kinds of bridge types of continuous girder bridge and single tower cable-stayed bridge, a bridge collapse pattern recognition method based on limit analysis theory is proposed. First, the collapse model of single-tower cable-stayed bridge and continuous girder bridge with the location and displacement of failure point as the parameters is established. The limit analysis theory is used to solve the failure points and their failure forms that must be included in the partial or complete collapse of the bridge, and the ultimate bearing capacity force. Compared with the finite element method, this method can be used in the bridge conceptual design stage to quickly identify the bridge collapse mode and calculate the ultimate bearing capacity of the structure. The calculated results can provide a scientific basis for correctly evaluating the anti-collapse capability of bridges, establishing the concept of disaster-resistant design and adopting effective disaster mitigation measures.