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水中圆柱体承受水平地震作用,假设水是理想不可压缩的,其运动是无旋的,液体自由表面的重力波是线性小振幅波。问题归结为圆柱体的辐射问题。文中导出了液动压力,底部剪力以及倾覆力矩等的计算公式,并给出了应用FFT的计算方法。然后,以人工地震波为激励,计算水中圆柱体上作用的液动压力等响应,以示应用。本文采用频域响应分析法,并用FFT技术代替通常的积分运算,充分利用了FFT提供的快速、简便的优点,不但节约了计算时间,并且提高了计算精度。
Cylinders in water are subject to horizontal seismic forces, assuming that water is ideally incompressible and its motion is irrotational, and gravity waves on free-surface liquids are linearly small amplitude waves. The problem comes down to the problem of cylinder radiation. In this paper, the formulas of hydraulic pressure, bottom shear force and overturning moment are deduced, and the calculation method using FFT is given. Then, using artificial seismic waves as an incentive, calculate the hydrodynamic pressure response on the cylinder in water to show the application. In this paper, frequency domain response analysis method, and use FFT technology instead of the usual integral operation, take full advantage of the FFT provides fast, simple advantages, not only saves the calculation time, and improves the calculation accuracy.