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本文利用堆聚质量法对海洋平台结构进行了抗震分析,计算中考虑了桩—土—结构的动力相互作用以及非线性流体作用力的影响。在求解过程中,未采用常用的等价线性化法,而运用了“Fourier变换—时域迭代混合法”。该法概念清晰,简便易行,且收敛速度较快,并有推广应用的可能性。计算结果表明:海洋平台结构的抗震分析必须考虑桩—土—结构的动力相互作用;体系的第一振型对结构响应起着控制作用;利用本文所提供的方法可以得到较满意的结果。
In this paper, the anti-seismic analysis of the offshore platform structure is carried out by using the method of mass stacking. The dynamic interaction of pile-soil-structure and the effect of nonlinear fluid force are considered in the calculation. In the solution process, the commonly used equivalent linearization method was not used, and the “Fourier transform—time-domain iterative hybrid method” was used. The concept of the law is clear, simple and easy, and the convergence speed is fast, and there is the possibility of popularization and application. The calculation results show that the seismic analysis of the offshore platform structure must consider the dynamic interaction between piles and soil-structures; the first mode of the system plays a role in controlling the structural response; satisfactory results can be obtained by using the methods provided in this paper.