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首页> 外文期刊>Engineering Structures >Probabilistic seismic performance assessment of an existing RC bridge with portal-frame piers designed for gravity loads only
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Probabilistic seismic performance assessment of an existing RC bridge with portal-frame piers designed for gravity loads only

机译：仅具有重力荷载的现有门框式钢筋混凝土桥梁的概率地震性能评估

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摘要

The present analytical work illustrates a thorough assessment of the seismic performance of an existing reinforced concrete (RC) bridge with framed piers designed for gravity loads only. The seismic response is investigated through advanced, comprehensive and efficient dynamic non-linear analyses. The evaluation of the seismic performance for ductile and fragile components has been carried out with simplified yet reliable formulations, either based on codes or experimentally derived, partially validated with numerical simulations. The effects of far-field and near-source strong motions on the seismic response of the sample bridge have been assessed and discussed in details. Fragility curves are derived using both Cloud analysis and Incremental Dynamic Analysis (IDA) and considering two limit states, i.e. damage limitation and collapse. The outcomes of the refined numerical simulations show that the near-source strong motions tend to impose higher inelastic demand on fragile components of the bridge system than far-field records, nevertheless fragility curves relative to the latter records exhibit higher probability of failure than the near-source strong motion counterparts. For the damage assessment, it is found that the Cloud analysis lead to fragility curves similar to those derived through the IDA procedure. Finally, a new approach facilitating the preliminary identification of the weakest link of the bridge, namely the pier-by-pier fragility, is presented. (C) 2017 Elsevier Ltd. All rights reserved.
机译：本分析工作说明了对现有钢筋混凝土（RC）桥的抗震性能的全面评估，该桥仅用于重力荷载。通过先进，全面，有效的动态非线性分析来研究地震响应。延性和脆性部件的抗震性能评估已通过简化但可靠的公式进行，这些公式基于规范或通过实验得出，并通过数值模拟进行了部分验证。评估和讨论了远场和近源强运动对样桥地震响应的影响。易损性曲线是使用Cloud分析和增量动态分析（IDA）并考虑两个极限状态（即破坏极限和崩溃）得出的。精确数值模拟的结果表明，与远场记录相比，近源强运动倾向于对桥梁系统的易碎部件施加更高的非弹性要求，尽管如此，相对于后记录的易碎曲线比近场记录显示出更高的失效概率。源强力的同行。对于损害评估，发现通过Cloud分析得出的脆弱性曲线类似于通过IDA程序得出的脆弱性曲线。最后，提出了一种有助于初步识别桥梁最薄弱环节的新方法，即桥墩的脆性。 （C）2017 Elsevier Ltd.保留所有权利。

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