Design and performance evaluation framework for seismically isolated reinforcement concrete columns subjected to blast loads
Design and performance evaluation framework for seismically isolated reinforcement concrete columns subjected to blast loads
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DOI：
10.1016/j.istruc.2022.10.041
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发表时间：
2022-11
期刊：
影响因子：
4.1
通讯作者：
Yanchao Wang;Qingjun Chen;Zhipeng Zhao;H. Qiang;Kai Yang;Xinfeng Wang
中科院分区：
文献类型：
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作者：
Yanchao Wang;Qingjun Chen;Zhipeng Zhao;H. Qiang;Kai Yang;Xinfeng Wang
隔震柱已被证明可以有效地改善建筑物、桥梁和地下结构在强震下的抗震性能。然而，考虑到可能的爆炸情况下，意想不到的爆炸载荷发生在这种振动隔离的情况下，本研究提出了一个基于爆炸的性能评估框架，在列顶部或底部配备隔离器的实际列。建立了爆炸荷载作用下隔震柱的有限元模型和仿真方法，并在此基础上得到了隔震柱的爆炸响应。通过结合基于位移和能力的评估方法，所提出的评估框架包括静-动-静耦合分析，性能指标提取和剩余承载能力分析。在此框架下，考虑不同装药量、不同爆高和不同轴向压力，对比研究了原柱和隔离柱的抗爆性能，说明了隔离柱抗爆性能评价的必要性。研究结果表明，所建立的抗爆评价框架能够有效地量化带隔离器的柱体的多性能，并将原始柱体和隔离柱体的抗爆性能进行对比，形成可供参考的评价数据库。通过在柱顶部（1端）或顶部和底部（2端）插入隔离器，隔离柱在经受多级爆炸载荷时表现出相同或甚至更高的抗爆能力和剩余承载能力。分离的柱显示出比原始柱更及时的反应。安装在柱顶部和底部的2端隔离器提供了较低的爆炸引起的反应和改善的稳定性的列，这些建议，在这项研究中，以提高高水平的地震恢复力和抗爆性。
Isolated columns have proven to effectively improve the seismic performance of buildings, bridges, and underground structures subjected to strong earthquakes. However, considering possible explosive scenarios where unexpected blast loads occur in this vibration-isolation scenario, this study proposes a blast-based performance evaluation framework for practical columns equipped with isolators at the column top or bottom. The finite element model and simulation methods were established for isolated columns subjected to blast loads, based on which blast-induced responses could be obtained. By incorporating displacement- and capacity-based evaluation methods, the proposed evaluation framework includes static–dynamic–static coupling analysis, performance index extraction, and remaining loading capacity analysis. With the proposed framework, the blast-resistance performances of the original and isolated columns were comparatively studied by considering different explosive charges, multiple explosion heights, and various axial pressures, signifying the necessity of assessing the anti-blast performance of isolated columns. The obtained results underlined the effectiveness of the developed blast-resistance evaluation framework in quantifying the multi-performance of isolator-equipped columns, based on which the comparative performances of the original and isolated columns formed an evaluation database for reference. Benefiting from the inserted isolators at the column top (1-end) or both top and bottom (2-end), the isolated columns exhibited the same or even improved blast-resistance capacity and remaining loading capacity when subjected to multilevel blast loads. The isolated columns demonstrated a timelier reaction than the original columns. The 2-end isolators installed at column top and bottom provided the columns with lower blast-induced responses and improved stability; these are suggested, in this study, to improve high-level seismic resilience and blast resistance.