下承式钢管混凝土刚架系杆拱桥吊杆断裂动力分析

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振动与冲击 ›› 2014, Vol. 33 ›› Issue (15) : 144-149.

论文

下承式钢管混凝土刚架系杆拱桥吊杆断裂动力分析

吴庆雄，余印根，陈宝春

作者信息 +

Dynamic Analysis for Cable Loss of A Rigid-Frame Tied Through Concrete-filled Steel Tubular Arch Bridge

WU Qing-xiong YU Yin-gen CHEN Bao-chun

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摘要

以一座下承式钢管混凝土刚架系杆拱桥为研究对象，采用ANSYS/LS-DYNA软件建立有限元模型，通过接触碰撞的方式进行吊杆断裂的模拟，分析吊杆断裂前后拱桥各结构构件受力状态的变化，判断结构可能发生的破坏形态。分析结果表明，吊杆断裂过程中吊杆、钢管混凝土拱肋和桥道系均会受到断索冲击的作用；与断裂吊杆相邻的吊杆受到断索冲击的作用最大，其轴力变化量为初始轴力的3倍以上，需要考虑由于吊杆断裂过程中产生的大于静力响应的动力作用；吊杆断裂对主梁产生的影响远大于拱肋，拱肋内力变化较小；由于横梁两侧与纵梁连接处焊缝强度不足发生破坏可能导致桥道系局部坍塌。

Abstract

Based on a rigid-frame tied through CFST arch bridge, the finite element model was built with the ANSYS/LS-DYNA software. The process of cable loss was simulated with the contact-impact method to analyze the variation of the internal forces of different structure members before and after cable loss and determine the potential failure mode. The results show that cables, CFST arch ribs and deck slabs are all influenced by the impact produced by the process of cable loss. Among them, the influence of cable loss on the adjacent cables is the largest and the variation of axial force can exceed three times of the initial force. Therefore, the effect of dynamic force, which is far greater than the static response during the cable loss, should be considered. It is also concluded that the influence of cable loss on the main girder is significantly greater than that on the arch ribs. The local collapse of floor system can be found due to the insufficient strength of the weld connection between the transverse and longitudinal beams.

导出引用

吴庆雄;余印根;陈宝春. 下承式钢管混凝土刚架系杆拱桥吊杆断裂动力分析[J]. 振动与冲击, 2014, 33(15): 144-149

WU Qing-xiong YU Yin-gen CHEN Bao-chun. Dynamic Analysis for Cable Loss of A Rigid-Frame Tied Through Concrete-filled Steel Tubular Arch Bridge[J]. Journal of Vibration and Shock, 2014, 33(15): 144-149