【摘要】 利用水下地震模拟系统,开展了刚性管道在地震作用下的水下模型实验,量测了管道周围流场的变化和管道表面的动水压力。基于Morison方程建立了地震作用下海底悬跨管道的动水作用力模型,按最小二乘原理得出管道的拖曳力系数CD和惯性力系数CM。通过对实测数据分析得出,雷诺数Re数和Kc数是影响管道受力的两个主要因素。分别对CD和CM随Re和Kc的变化趋势进行了拟合,得到CD和CM的定量表达公式。本次试验工况下,水深和悬跨高度对管道的受力影响不明显。更多还原

【Abstract】 Model tests of a free spanning rigid submarine pipe subjected to earthquake were conducted on an underwater shaking table. The fluid field adjacent to the pipe and hydrodynamic force on the surface of the pipe were measured. The drag coefficient CD and the inertia coefficient CM used in Morison equation were obtained on the basis of least square method. The experimental results showed that Reynolds number Re and Keulegan-Carpenter number Kc were two main parameters influencing the hydrodynamic forces imposed on pipeline under earthquakes. The variation of CD and CM with function of Reand Kc fitted by regression analysis was expressed quantitatively. Water depth and span height had no significant effects on the hydrodynamic forces of pipeline under these experimental cases.更多还原