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本文首先说明了近几年来,结构系统余度概念的建立;并提出用结构残余强度及残余结构可靠度这两个指标以定量表示结构系统余度的数量特征。探讨了结构布局、材料特性与结构残余强度指标间的关系;导出了典型情况下的计算公式;提出了以结构残余强度指标为约束时的设计原则、理论以及相应的优化设计方法。同时又指出了结构残余强度指标的局限性,建议必须与作者提出的残余结构可靠度这一概念结合在一起讨论;文中也提出了以残余结构可靠度指标为约束时的设计原则、理论以及相应的优化设计方法。
In this paper, firstly, the concept of structural system redundancy has been established. In the meantime, the quantitative characteristics of structural system redundancy have been proposed by using the two indicators of structural residual strength and residual structural reliability. The relationship between structure layout, material properties and structural residual strength index is discussed. The calculation formula under typical conditions is deduced. The design principle, theory and the corresponding optimization design method are proposed when the structural residual strength index is constrained. At the same time, the limitations of the residual strength index are pointed out. The suggestion must be discussed together with the concept of residual structural reliability proposed by the author. The paper also presents the design principles and theories when the residual structural reliability index is constrained, The optimal design method.