深水桥梁墩—水耦合作用计算模式对比研究

为了能够准确、高效地计算深水桥梁的墩—水耦合作用,以墩高及入水深度均为60 m的圆形实心墩为研究对象,在对目前常用的3种动水压力计算方法(Morison公式、辐射波浪法和流体声单元法)进行理论研究、对流体声单元法流体域边界条件进行改进的基础上,建立了相应的墩—水耦合计算模型,对常用深水桥墩动力特性和动力响应进行对比分析,得到3种方法在计算效率、计算精度方面的差异及适用范围.结果表明:辐射波浪法、Morison公式计算效率高于流体声单元法;辐射波浪法计算精度高于Morison公式、流体声单元法;流体声单元法适用范围比Morison公式、辐射波浪法广.

Comparative Study of Pier-Water Interaction Calculation Model of Deep Water Bridge

To accurately calculate the pier-water interaction of deep water bridge with high efficiency,the circular solid pier which is 60 m in length and with 60 m immersed into water is taken as study object.Three commonly used methods for calculating hydrodynamic pressure,including Morison Equation Method(MEM),Radiation Wave Method(RWM) and Fluid Element Method(FEM),were theoretically studied.And then based on the improvement of the boundary conditions of the fluid domain of FEM,a corresponding calculation model of pier-water interaction was established to make comparative analysis of the dynamic performance and dynamic response of deep water pier,finally,the differences of the three methods in calculation efficiency and calculation precision and their application range were obtained.The results of the analysis indicate that the calculation efficiency of RWM and MEM is higher than that of FEM;the calculation precision of RW is higher than those of MEM and FEM;and the application range of FEM is wider than those of MEM and RWM.