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Identification of critical ground motions for seismic performance assessment of structures

机译：识别关键地震动以评估结构的抗震性能

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摘要

A method is established to identify critical earthquake ground motions that are to be used in physical testing or subsequent advanced computational studies to enable seismic performance to be assessed. The ground motion identification procedure consists of: choosing a suitable suite of ground motions and an appropriate intensity measure; selecting a computational tool and modelling the structure accordingly; performing Incremental Dynamic Analysis on a non-linear model of the structure; interpreting these results into 50th (median) and 90th percentile performance bounds; and identifying the critical ground motions that are close to these defining probabilistic curves at ground motion intensities corresponding to the design basis earthquake and the maximum considered earthquake. An illustrative example of the procedure is given for a reinforced concrete highway bridge pier designed to New Zealand specifications. Pseudodynamic tests and finite element based time history analyses are performed on the pier using three earthquake ground motions identified as: (ⅰ) a Design Basis Earthquake (10% probability in 50 years) with 90 percent confidence of non-exceedance; (ⅱ) a Maximum Considered Event (2% probability in 50 years) representing a median response; and (ⅲ) a Maximum Considered Event representing 90 percent confidence of non-exceedance.
机译：建立了一种方法，用于识别将在物理测试或后续的高级计算研究中使用的关键地震地面运动，以评估地震性能。地面运动识别程序包括：选择合适的地面运动套件和合适的强度度量；选择计算工具并对模型进行相应建模；对结构的非线性模型执行增量动力分析；将这些结果解释为第50个（中位数）和第90个百分点的性能范围；确定与设计基准地震和考虑的最大地震相对应的地震动强度下接近这些定义的概率曲线的临界地震动。该过程的一个说明性示例是根据新西兰规范设计的钢筋混凝土公路桥墩。使用以下三个地震地面运动对墩进行了拟动力试验和基于有限元的时程分析：（ⅰ）设计基准地震（50年内发生概率为10％），有90％的超标置信度； （ⅱ）代表中位数反应的最大考虑事件（50年内发生概率为2％）； （ⅲ）代表90％的不超过置信度的“最高考虑事件”。

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