斜拉桥单塔结构在波浪作用下的数值模拟与试验研究

为了更准确的得到斜拉桥单塔结构的群桩承台基础上的波浪力,采用CFD方法,依据Stokes二阶波理论在FLUENT中运用边界造波法进行造波,数值模拟波浪作用下斜拉桥单塔结构的桩和承台上的一些点的动水压力,将这些动水压力与试验测得的动水压力进行对比,验证了CFD方法在模拟群桩承台结构波浪力方面的有效性。用有限元软件ANSYS建立斜拉桥单塔结构有限元模型,分别对结构的加速度、位移、应力结果进行分析。将数值模拟的加速度与试验加速度对比分析,验证了将点的动压转化为波浪集中力及施加到有限元模型上的方法是合理的。对位移和应力分析可知,斜拉桥单塔结构在波浪作用下是安全稳定的,与试验观测到的现象相一致。

Numerical Simulation and Experimental Study on Single Tower of Cable-Stayed Bridge Under Wave Action

In order to accurately obtain the wave force of the single-tower of the cable-stayed bridge,the CFD method is used in this paper.The boundary wave method was adopted as well which is based on the Stokes second-order wave theory to generate wave in FLUENT.Numerical simulation of the hydrodynamic pressure at several points on the pile and the cap were compared with the hydrodynamic pressure with the experimental hydrodynamic pressure.According to the comparison,the CFD method is verified effectively when simulate the wave force on the pile and the cap structures.ANSYS was adopted to establish the finite element model of the single-tower of the cable-stayed bridge.The acceleration,displacement and stress results of the structure are analyzed respectively.The method of the conversion between dynamic pressure of the point and wave force is verified reasonable by comparing the numerical acceleration with the experimental acceleration.Displacement and stress analysis shows that the single tower of the cable-stayed bridge is safe and stable under the wave action,which is consistent with the observed phenomena in the experiment.