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Probabilistic assessment of structures considering the effect of cumulative damage under seismic sequences

机译：考虑地震序列累积损伤效果的结构概率评价

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摘要

An approach to describe the evolution of damage that a structure could accumulate by the action of seismic sequences at the end of a time interval is proposed. The cumulative damage is quantified by means of a damage index that considers both the demanded drift and ultimate drift. The damage index at the end of a time interval is expressed in terms of: (a) the distribution function of damage and (b) the distribution function to the first failure. Based on the above, the structural reliability is obtained, and it is expressed in terms of reliability functions. The proposed criterion considers the stochastic variability of the seismic occurrence that affects the structural performance under seismic loads. Distribution functions and reliability functions are obtained for a reinforced concrete bridge located in transition soil (type 2) in Mexico City. Such bridge was designed for three different drift thresholds. The different study cases are subjected to seismic sequences during a time interval. Acceptable reliability levels were found up to 50 years after the bridge construction.
机译：提出了一种描述结构可以通过在时间间隔结束时通过地震序列的作用积累的损害的进化的方法。通过损坏指数来量化累积损伤，这些损坏指数考虑了所需的漂移和最终漂移。时间间隔结束时的损伤索引是表示的：（a）损坏的分布函数和（b）第一个故障的分布函数。基于上述，获得结构可靠性，并且在可靠性函数方面表达。该拟议标准考虑了影响地震载荷下结构性能的地震发生的随机变化。为位于墨西哥城的过渡土（2型）中的钢筋混凝土桥获得分配功能和可靠性功能。这种桥设计用于三个不同的漂移阈值。在时间间隔期间，不同的研究病例受到地震序列。桥梁建设后50年来发现可接受的可靠性水平。

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