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本文对海洋平台结构地震反应运动方程中的非线性流体阻力项,按振动一周力作功相等的原则,等效为线性的粘滞阻尼力。在等效的过程中,作者提出了所谓“拟静态位移”的概念,用它代替等效粘滞阻尼系数中与频率有关的位移幅值,从而使计算大为简化。文中还以一简单的海洋工程结构为例,按该近似方法计算了它在某地震记录输入下的反应,并与“Fourier变换-时域迭代混合法”计算的结果进行了对比。结果表明:利用本文的近似方法计算海洋平台结构的地震反应不仅速度快、费用少,而且具有较高的精度。 该法还可以推广应用于同时受地震荷载及波浪荷载作用的海洋平台结构的反应分析。
In this paper, the non-linear fluid resistance in the equation of motion for seismic response of offshore platform structures is based on the principle of equal work for one-cycle vibration, which is equivalent to a linear viscous damping force. In the equivalent process, the author proposed the concept of so-called “quasi-static displacement” and used it to replace the frequency-dependent displacement amplitude in the equivalent viscous damping coefficient, which greatly simplified the calculation. In this paper, a simple ocean engineering structure is also taken as an example. According to the approximate method, its response under a seismic record input is calculated and compared with the result of Fourier transform-time domain iterative hybrid method. The results show that using the approximate method of this paper to calculate the seismic response of the offshore platform structure is not only fast and cost-effective, but also has high accuracy. This method can also be applied to the response analysis of offshore platform structures that are simultaneously subjected to seismic and wave loads.