基于线性变幅叠加法的不规则波浪力数值模拟

Digital Simulation of the Irregular Wave Based on Linear Amplitude Superposition Method

计算独立墩柱上的波浪力时,按Morison公式得到的拖曳力项是非线性的,当需考虑该项时,用常规的谱法计算不规则波浪力作用过于理想化。模拟波浪常用的线性叠加法或线性过滤法,计算工作量偏大。基于此,采用线性变幅叠加法求不规则波浪力,对墩柱分段进行单自由度简化,并将波浪力折算至墩柱顶端,求墩柱顶端的动力响应。结合参考资料的算例,对简化后的计算方法进行了验证。

when calculating wave forces on independent pier, the drag force obtained from Morison formula is nonlinear. By consideration of the aspect, calculation of irregular wave forces is too ideal with spectrum analysis routine. When common wave superposition method or linear filtering method is used to simulate the wave, the calculation workload is apparently. Based on this, when irregular wave forces on piers were calculated by the linear amplitude superposition method, segments of single degree of freedom were simplified, and the wave force was converted to dynamic response of pier top. With reference example, the simplified calculation method of wave force was verified.