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为准确计算复合结构中小尺度杆件上的波浪荷载,不仅要考虑入射波浪作用,还应该考虑大尺度结构物对波浪的绕射以及辐射影响.以畸形波对固定圆柱作用产生的绕射场为例,用Morison公式计算绕射场作用下细小杆件的波浪荷载.用高阶边界元法建立波浪对结构物作用的时域计算程序,利用积分方程求域内水质点由绕射势产生的速度和加速度.结果显示,在一定波浪条件下,杆件上的总波浪力为入射波浪力的1.2倍.因此,在工程中应充分考虑复合结构中由于大尺度结构物存在产生的绕射和辐射作用对细小杆件的波浪力.
In order to accurately calculate the wave load on the small-scale bar in the composite structure, not only the incident wave effect but also the diffraction and the radiation effect of the large-scale structure on the wave should be considered. The diffraction field caused by the effect of the deformed wave on the fixed cylinder is For example, the Morison formula is used to calculate the wave loading of the small rod under the action of the diffraction field. The high-order boundary element method is used to establish the time-domain calculation of the wave effect on the structure. The integral equation is used to find the velocity And acceleration.The results show that under certain wave conditions, the total wave force on the rod is 1.2 times of the incident wave force.Therefore, the diffraction and radiation due to the presence of large-scale structures in the composite structure should be fully considered in the project Wave force acting on a small rod.