升船机结构抗震可靠度分析中若干问题的探讨

本文基于结构随机振动理论和首次超越破坏机制，以某大型升船机建筑结构为背景，应用三维有限元方法，首先对升船机建筑结构的随机地震反应问题进行了计算。在此基础上，对在不同地震烈度下大型升船机建筑结构的抗震可靠度及界限值的随机性对结构抗震可靠度的影响等问题进行了分析，探讨了基于Poisson过程假定和基于Markov过程假定的可靠度在不同地震烈度下的适用性、以及确定性界限和随机性界限对可靠度结果的影响等问题，得到了一些有应用价值的结果。最后，对在8、9度地震烈度下大型升船机建筑结构抗震可靠度分析模型的选用提出了建议。

Study of Some Seismic Reliability Analysis Problems of Ship-Lifter Tower Structure

In this paper, the random response and seismic reliability of a large ship-lifter tower structure were investigated by using 3-D model. The analysis method was based on the first excursion probability and finite element method. First, the response power spectral-density and standard deviation of the large ship-lifter tower structure were anlyzed. Next, the seismic: reliability of the ship-lifter tower structure under different earthquake intensity was calculated, and some questions concerning the suitability of Poisson's hypothesis and Markov's hypothesis for different earthquake intensity and the effect of definite level and random level on seismic reliability were discussed. Finally, the advisable model for seismic reliability analysis of large shiplifter tower structure under 8 degree and 9 degree earthquake intensity is suggested.