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中文摘要：
约界阈值是快速准确识别工程结构主要失效模式、进而开展结构体系可靠度分析的关键参数。针对传统口约界法主要依靠主观经验确定约界阈值所存在的缺陷，提出结构体系可靠度分析的自适应动态约界法。通过定义失效概率均匀度、基准失效概率和基准可靠指标，确定结构失效历程不同阶段的动态约界阈值和约界准则，据此可以合理反映结构中元件失效概率的分布状况，进而快速、准确地识别候选失效元件，并及时剔除发生概率很小的次要失效模式，实现结构失效路径的自适应动态分枝和约界。研究表明，该方法能够根据失效演化历程中元件失效概率的分布状况自动调整约界阈值，克服传统β约界法的缺陷，可以避免遗漏发生概率较大的主要失效模式，从而取得更高的计算精度。
英文摘要：
The bounding threshold is of significance for the identification of dominant failure modes and the calculation of structural system reliability. To overcome the disadvantage of traditional approaches in empirically determining the bounding thresholds of fl-unzipping method, an adaptive dynamic bounding method was proposed in this study for reliability analysis of structural system. By defining the uniformity of failure probability （ UFP）, the reference failure probability （RFP） and the reference reliability index （RRI）, the distribution of failure probability can be taken into account to identify the potential failure elements in every failure evolution stage. Based on the UFP, the RFP and the RRI, an adaptive dynamic bounding method for reliability analysis of structural system was proposed. Compared with the traditional bounding approaches, the proposed adaptive dynamic bounding method possesses desirable accuracy for reliability analysis of structural system, since it considers the distribution of failure probability in every failure evolution stage.
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