考虑桩土作用的桥墩受船舶撞击动力响应分析

Analysis on Dynamic Responses of Bridge Pier Subjected to Ship Collision Considering the Pile-soil Interaction

通过有限元软件ANSYS/LS-DYNA对船桥碰撞进行数值模拟,分析桥墩的动力响应。以南京长江三桥北主墩为背景建立有限元模型,分析了桩土作用对桥墩船撞响应的影响,比较了不同桩土模型计算结果之间的差异。结果表明,桩土作用对桥墩的动力响应有显著影响,有限域土体法模型的计算结果最为精确但计算成本较大,8倍桩径嵌固端模型的计算结果与等效弹簧法模型和有限域土体法模型的计算结果较为吻合。

The ship-bridge collision was simulated by the finite element software ANSYS/LS-DYNA and the dynamic responses of bridge pier were analyzed.Based on the north main pier of Nanjing No.3 Yangtze river bridge,a finite element model was established to analyze the effect of pile-soil interaction on the dynamic response of the pier,and the differences between various results obtained by different pile-soil models were also compared.The results indicated that the pile-soil interaction had a noteworthy effect on the dynamic responses of bridge pier.The finite domain soil model was the most accurate,however it needed longer calculation time.The simulation results of 8-fold pile diameter model,equivalent spring model and finite domain soil model were in good agreement.