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Dispersions for the pushover-based risk assessment of reinforced concrete frames and cantilever walls

机译：用于钢筋混凝土框架和悬臂墙的基于推覆的风险评估的分散体

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The paper presents the results of an investigation into the dispersion values, expressed in terms of limit-state spectral accelerations, which could be used for the pushover-based risk assessment of low-height to mid-height reinforced concrete frames and cantilever walls. The results of an extensive parametric study of a portfolio of test structures indicated that the dispersion values due to record-to-record variability and modelling uncertainty (beta(LS,RU)) are within the range from 0.3 to 0.55 for the near collapse limit state, and between 0.35 and 0.60 for the collapse limit state. The dispersions beta(LS,RU) proposed for the code-conforming and the majority of old (non code-conforming) frames are in between these values. On the other hand, the dispersions proposed for the old frames with a soft storey and an invariant plastic mechanism, and for the code-conforming cantilever walls, are at the lower and upper bounds of the presented values, respectively. The structural parameters that influence these dispersions were identified, and the influence of different ground motion sets, and of the models used for the calculation of the rotation capacities of the columns, on the calculated fragility parameters was examined and quantified. The proposed dispersion values were employed in a practice-oriented pushover-based method for the estimation of failure probability for eight selected examples. The pushover-based risk assessment method, although extremely simple and economical when compared with more rigorous probabilistic methods, was able to predict seismic risk with reasonable accuracy, thus showing it to be a practical tool for engineers. Copyright (C) 2016 John Wiley & Sons, Ltd.
机译：本文介绍了以极限状态频谱加速度表示的色散值的调查结果，该结果可用于基于推卸的低高度到中高度钢筋混凝土框架和悬臂墙的风险评估。对测试结构组合进行广泛的参数研究的结果表明，由于记录到记录的可变性和建模不确定性（β（LS，RU））导致的弥散值在接近崩溃极限的范围内为0.3到0.55崩溃极限状态，且介于0.35和0.60之间。建议用于代码符合的色散beta（LS，RU）和大多数旧的（不符合代码的）帧位于这些值之间。另一方面，针对具有软层和不变塑性机制的旧框架以及针对符合代码要求的悬臂墙，建议的色散分别位于显示值的下限和上限。确定影响这些分散的结构参数，并检查和量化不同地面运动集以及用于计算柱旋转能力的模型对计算的脆性参数的影响。在基于实践的基于推展的方法中，建议的色散值用于八个选定示例的故障概率估计。基于推覆的风险评估方法尽管与更为严格的概率方法相比极其简单且经济，但它能够以合理的准确度预测地震风险，因此表明它是工程师的实用工具。版权所有（C）2016 John Wiley＆Sons，Ltd.

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