深水桥梁墩水耦合抗震分析方法

Seismic Analysis Method of Deep-Water Bridge Pier and Water Coupling

为正确采用动水压力计算方法,提出了一种新的深水桥梁墩水耦合计算方法——结合法,即将Morison方程与计算流体力学相结合,分析深水桥梁墩水耦合抗震问题.ANSYS-CFX模型计算表明:结合法能较好地进行墩水耦合抗震分析;深水环境使墩顶最大弹性位移减小,最大刚体位移增大,结构整体变形增大;刚体运动附加动水力对桥墩起主要作用,但应同时考虑弹性振动引起的动水压力.

To adopt a right method to calculate hydrodynamic pressure, a novel method, combining the Morison equation with CFD （computational fluid dynamics）, for calculating the seismic responses of a deep-water bridge under pier-water coupling was proposed. The results based on the ANSYS-CFX model show that the proposed method can calculate the seismic responses of a deep-water bridge under pier-water coupling effectively. A deep-water environment will decrease the maximum elastic displacement at pier top, but it will increase the maximum rigid displacement and the total stsructure displacement. Additional hydrodynamic pressure generated by rigid motion plays a major role, and the effect of elastic vibration must be considered.