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本文采用框架结构的层间失效模式，将框架结构看作是一个失效相关的串联体系，建立了框架结构体系可靠度的计算模型。同时，在结构体系可靠度一定的条件下，以层间刚度作为优化变量，对框架结构进行可靠度的最优分配，使整个结构的造价最低。这样的设计方法可以充分发挥材料的抗力，达到节省材料的目的，显然，本文方法是对现有工程结构可靠性设计方法的一种改进。
This paper adopts the inter-layer failure mode of the frame structure, regards the frame structure as a failure-related series system, and establishes the calculation model of the reliability of the frame structure system. At the same time, under the condition of certain reliability of the structural system, using the inter-story stiffness as the optimization variable, the reliability of the frame structure is optimally distributed, so that the construction cost of the entire structure is the lowest. This design method can give full play to the resistance of the material and achieve the purpose of saving materials. Obviously, this method is an improvement to the existing engineering structure reliability design method.