Abstract：To evaluate the beam-end pounding probability of long-span asymmetric suspension bridge subjected to random earthquake action, a three-dimensional nonlinear finite element model of a typical example bridge was established using OpenSEES software. The bridge pounding probability model was proposed based on the Latin hypercube sampling (LHS) and kernel density estimation (KDE) method by considering the random characteristics of both ground motion and model parameters and its validity was verified. Finally, the influences of random parameters of bridge structure, expansion joint width and nonlinear damper on the beam-end pounding probability of suspension bridge were investigated. Results indicate that the bridge pounding probability may be overestimated with the maximum error of 122% if the uncertainty of bridge structural parameters is ignored. The pounding probability of the bridge under severe earthquakes can be decreased significantly by using the nonlinear damper, and the seismic mitigation effect of the damper increases with the increase of the expansion joint width. When the PGA is less than 0.7g, the damper can both reduce the peak impact force of the suspension bridge and the pounding times of the beam-end. When the PGA is greater than 0.7g, the damper has little effect on the pounding times while can evidently reduce the impact force.
师新虎1，丁自豪2，贾宏宇2，郑史雄2，李树鼎1. 基于核密度估计法的大跨度非对称悬索桥碰撞概率分析[J]. 振动与冲击, 2023, 42(16): 269-277.
SHI Xinhu1, DING Zihao2, JIA Hongyu2, ZHENG Shixiong2， LI Shuding1. Pounding probability analysis of a long-span asymmetric suspension bridge based on a kernel density estimation method. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(16): 269-277.
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