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利用ADINA中的势流体单元对一已建成的深水高墩建模,桥梁上部结构对桥墩的影响以墩顶集中质量的形式体现,分别对不同水深条件下桥墩-水体系的动力特性和地震动响应进行了系统的求解;为了检验Morison方程在深水桥墩动力分析中的有效性,将基于忽略速度力项的Morison方程的计算结果与基于势流体的结果进行了比较。研究结果表明:①水体对结构的自振频率折减影响随着水深的增大而增大,基于Morison方程得到的结构频率的影响大于势流体模型;②水深对墩顶位移的影响比加速度明显,墩底剪力受水深的影响大于其对墩底弯矩的影响;③考虑上部集中质量的影响,结构的响应会不同程度地减小;④相对于势流模型,忽略速度项的Morison方程所得到的结构动力反应略显保守。
Using the potential fluid unit in ADINA to model a completed deep-water high pier, the influence of the superstructure of the bridge on the piers is manifested in the form of concentrated mass at the pier top. The dynamic characteristics of the piers-water system under different water depths and the ground motion In order to test the validity of the Morison equation in the dynamic analysis of deepwater piers, the calculation results based on the Morison equation ignoring velocity force terms are compared with those based on potential fluid. The results show that: (1) the influence of water body on natural frequency decreases with the increase of water depth, and the effect of structural frequency based on Morison’s equation is greater than that of potential fluid model; (2) the effect of water depth on displacement of pier is more obvious than that of acceleration , The influence of the shear force at the pier bottom on the depth of the pier is greater than that on the moment at the pier bottom. (3) The response of the structure will decrease to some extent, considering the influence of the upper concentrated mass. (4) Compared with the potential flow model, The resulting structural dynamic response is slightly conservative.