矩形深水空心桥墩与实体桥墩的振动特性分析

摘要

基于流固耦合的有限元计算方法，考虑桥墩（空心、实体）和水域两个因素，对深水中矩形空心桥墩和实体桥墩的振动特性进行了分析，通过计算得到，裸水时，空心桥墩的低阶自振频增大，高阶自振频率降低；有水域时，水体降低了桥墩的自振频率，空心桥墩自振频率比实体桥墩降低的大；水体对实体桥墩的高阶模态影响较大，对空心桥墩的低阶模态影响远大于对高阶模态，这对水下桥墩的抗震措施有很大指导作用。%The finite element method based on fluid-structure interaction, considering the two factors of the pier (hollow,solid),and the waters,the vibration characteristics of rectangular hollow piers and deep water sol-id piers were analyzed by calculation,when they out of water,hollow pier low-level vibration frequency in-creases,high-end natural vibration frequency decreases;when they in the water,water reduces the natural fre-quency of piers,hollow pier natural frequency lower than the solid piers;water has a large impact on high level simulation of solid piers,water on lower level impact of hollow pier greater high level simulation.It has a great guide for measures underwater seismic pier.