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为使自升式平台整体结构三维系统可靠性计算模型更加贴近实际结构,建立基于空间刚架结构和空间薄壁结构两种系统可靠性分析模型.以三维梁元模拟空间刚架结构,以杂交梁元和加筋板格元模拟空间薄壁结构,并推导加筋板格元的修正刚度矩阵和反向结点力向量,弥补了计算反向结点力向量时采用等剪应力矩形元替代加筋板格元的不足,最后运用改进的分支限界法搜索主要失效路径并结合PNET法计算系统失效概率,通过实例对自存和作业等工况下平台系统可靠性进行计算,对比两种系统可靠性模型的优缺点,给出工程设计建议.
In order to make the reliability calculation model of three-dimensional system of self-elevating platform overall structure closer to the actual structure, the reliability analysis model of two systems based on space rigid frame structure and space thin-walled structure is established.By the three-dimensional beam element simulation space rigid frame structure, Liang Yuan and stiffened plate lattice simulate the space thin-walled structure and derive the modified stiffness matrix and the inverted knot force vector of the stiffened plate lattice, which makes up for the replacement of equal shear stress rectangular element Stiffened plate lattice element. Finally, the improved branch-and-bound method is used to search for the main failure paths and the PNET method is used to calculate the probability of system failure. The reliability of the platform system under self-storage and job conditions is calculated through examples. The advantages and disadvantages of the reliability model, given engineering design recommendations.