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研究了随机时变结构特性，提出了随机时变强度的衰减表达式；在随机动力荷载作用下，用振型分解法分析了时变参数结构的动力响应，得到了此类结构的动力响应谱与数字统计式；给出了确定时变界限的方法；在若干基本假设下，得到了时变结构的可靠度计算公式；提出了在役结构时变可靠度的分析方法，以及结构在设计使用期与预计使用期限内可靠度评估公式
The characteristics of stochastic time-varying structure are studied, and the attenuation expression of stochastic time-varying intensity is proposed. Under the action of random dynamic load, the dynamic response of time-varying parameter structure is analyzed by mode-decomposition method, and the dynamic response spectrum of such structure is obtained. With the numerical statistical formula, the method of determining the time-varying limit is given; under certain basic assumptions, the reliability calculation formula of the time-varying structure is obtained; the analysis method of the time-varying reliability of the in-service structure is proposed, and the structure is used in design. Period and estimated useful life reliability assessment formula