Through the back-analysis of a computing example, the design optimization of pile-strut bracing structure of deep foundation pit is presented based on reliability analysis.

为了进行支护结构的可靠性设计，探讨了随机变量对支护结构设计的影响，并给出了进行支护结构计算的实例。

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Based on dynamic reliability, the problem of strengthening design optimization is discussed. The basic system of strengthening design optimization methods is established.

基于结构的动态可靠度理论，探讨结构加固的优化设计问题，建立了结构加固优化设计的基本方法体系。

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A numerical result of an optimization design based on reliability and redundancy subject to cost in complex system is provided in the paper.

给出了一复杂系统在造价约束下的可靠度和冗余数的并发优化设计结果。

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