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首页> 外文期刊>Bulletin of earthquake engineering >Seismic fragility assessment of infilled frames subject to mainshock/aftershock sequences using a double incremental dynamic analysis approach
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Seismic fragility assessment of infilled frames subject to mainshock/aftershock sequences using a double incremental dynamic analysis approach

机译：使用双重增量动态分析方法对主轴/余震序列受到主轴/余震序列的射击脆性评估

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摘要

The paper presents an assessment framework aimed at evaluating seismic fragility and residual capacity of masonry infilled reinforced concrete (RC) frames subject to mainshock/aftershock sequences. A double incremental dynamic analysis (D-IDA) approach is used, based on the combination of a mainshock (MS) signal at different intensities with a set of spectrum-compatible aftershocks (AS) scaled in amplitude with respect to peak ground acceleration. Limit state functions, specifically defined for infilled frames, are used to detect chord-rotation exceeding and shear collapse of RC members during standard and double incremental dynamic analyses. Intact and aftershock fragility curves are obtained for a reference full-scale RC frame specimen, by simulating seismic response with and without infills through a fully fiber section model developed in OpenSees. D-IDA results allow also defining aftershock residual capacity domains and loss diagrams, which are used to compare responses of bare and infilled frames subject to increasing MS intensities. Results show that masonry infills can drastically reduce seismic fragility of RC frame structures during main events and AS, and also limit and economic losses for the mid-low intensity earthquakes. Such beneficial contributions, however, depend on the capacity of RC members to support additional shear demand due frame-infill interaction and avoid sudden failures which conversely occur.
机译：本文提出了一种评估框架，旨在评估受主轴/余震序列的泥工含有含水钢筋混凝土（RC）框架的地震脆性和残留能力。基于在不同强度下的主轴（MS）信号的组合使用具有一组频谱兼容的余震（AS）的不同强度的组合使用双增量动态分析（D-IDA）方法，相对于峰接地加速度缩放。限制状态函数，具体定义为infilled帧，用于检测标准和双重增量动态分析期间RC成员的弦旋转超过和剪切塌陷。通过通过在开放式中开发的完全光纤部分模型模拟地震响应和无填充的地震反应来获得完整的和止血性脆弱曲线。 D-IDA结果还允许定义余震残留容量域和损耗图，用于比较裸露和潜入的帧的响应而受到MS强度的增加。结果表明，砌体填充物在主要事件期间和诸如中低强度地震的极限和经济损失以及中低强度地震的限制和经济损失，砌体填充物可以大大降低RC帧结构的地震脆弱性。然而，这种有益的贡献取决于RC成员支持额外的剪切需求的能力框架填充相互作用，避免突然发生故障。

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