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利用三维有限元方法对三峡升船机塔柱结构的动力学特性及随机地震响应进行了计算分析,结果表明塔柱结构柔度较大,其顶部节点随机地震位移响应为中宽带过程。在此基础上,采用首次超越破坏机制,以塔柱结构顶部典型位置的位移限值为可靠度界限,对设计地震烈度下升船机塔柱结构的时变动力可靠度进行了计算分析,得到了塔柱结构设计基准期内的时变动力可靠度,并讨论了可靠度界限值的随机性对结构抗震时变可靠度计算结果的影响,建议升船机结构抗震可靠度计算模型采用Markov过程假定。该文可为升船机结构设计及安全运行提供必要的参考。
The dynamic characteristics and stochastic seismic response of tower crane structure of Three Gorges ship lift are calculated and analyzed by using 3D finite element method. The results show that the structure of tower crane has large flexibility and the displacement response of the top node is medium-wideband. On the basis of this, using the first failure mechanism beyond the limits of reliability of the typical position of the top of the tower structure, the reliability of the time-varying force of the tower crane structure designed to reduce the seismic intensity is calculated and obtained The reliability of time-varying power during the design period of the tower structure is discussed. The influence of the randomness of the reliability limit on the calculation results of the seismic reliability of the structure is discussed. It is suggested that the model of the seismic reliability of the ship-elevator structure should adopt the Markov process assumed. This article can provide the necessary reference for the structural design and safe operation of ship lift.