结构—波浪—海床耦合系统中大圆筒结构的波压力响应

Wave pressure response of large cylindrical structures in seabed-wave-structure coupling system

以沉入式大圆筒结构为对象,通过设计随机波浪水槽实验,测取了在单筒和连续筒两种结构型式、两种沉入深度和两种波谱输入下结构表面的动波压力分布。波面高度以及波压力历程均在频域进行分析。通过计算结构表面沿高程和沿环向的波压力谱及波压力传递函数,将单筒实测结果与基于线性绕射理论的解析解进行了比较,同时也详细对比了两种结构型式下的实测结果。文中汇报了在研究中获得的新发现及进行的相应分析,特别是在结构—波浪—海床动力相互作用下对波压力响应机理以及针对连续筒的研究,可为工程应用提供有价值的参考。

The response of wave pressures on structures would be more complicated and bring about new phenomena under the dynamic interaction between structure, wave and seabed. It is valuable for engineering applications to investigate the response characteristics of wave pressures in this coupling system. Wave flume experiments were designed aiming at deeply embedded large cylindrical structures to investigate comparatively dynamic wave pressures on a single and on continous cylinders with two different embedment depths in response to two wave spectra. Time histories of the water surface elevation and wave pressure were analyzed in the frequency domain. By calculating the transfer function and spectral density for wave pressures along the height and around the circumference of the cylinder, experimental results of the single cylinder were compared with the theoretical based on the linear diffraction theory, and detailed comparisons were also made between the single and continuous cylinders. Some new findings and the corresponding analysis are reported in present paper. Investigations on the response mechanism of wave pressures under dynamic interaction between structure, wave and seabed, and on continous cylinders could be used as references in particular in engineering.