南昌大学工程建设学院,江西 南昌330031
周强(1983—),男,副教授,博士。主要从事结构抗震及灾场仿真研究。E‑mail: zhouqiang@ncu.edu.cn
收稿:2021-09-11,
修回:2021-11-26,
纸质出版:2023-08-28
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周强,肖晖,陈东等.主余震序列作用下砌体结构累积损伤分析[J].防灾减灾工程学报,2023,43(04):770-777.
ZHOU Qiang,XIAO Hui,CHEN Dong,et al.Cumulative Damage Analysis of Masonry Structure under Mainshock‑aftershock Sequence[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):770-777.
周强,肖晖,陈东等.主余震序列作用下砌体结构累积损伤分析[J].防灾减灾工程学报,2023,43(04):770-777. DOI: 10.13409/j.cnki.jdpme.20211111082.
ZHOU Qiang,XIAO Hui,CHEN Dong,et al.Cumulative Damage Analysis of Masonry Structure under Mainshock‑aftershock Sequence[J].Journal of Disaster Prevention and Mitigation Engineering,2023,43(04):770-777. DOI: 10.13409/j.cnki.jdpme.20211111082.
一次强震过后通常伴随有多次余震发生,多次地震作用下结构的震害往往比单独主震作用时更为严重。为探索主余震序列作用下砌体结构的累积损伤,对已开展的砌体结构振动台试验模型进行数值模拟,通过与试验结果对比分析,验证有限元模型的可靠性。在此基础上,采用真实的主余震地震动对原型结构进行弹塑性动力时程分析,以最大层间位移角、结构损伤耗能作为损伤指标,对比分析了主余震序列对结构累积损伤的影响。结果表明:结构损伤耗能对主余震序列作用下的累积损伤更敏感;结构损伤耗能受主震和余震强度的影响,其结构损伤耗能比与主震强度大致呈二次关系,与余震强度大致呈线性关系。
A strong earthquake is usually followed by many aftershocks, and the seismic damage caused by multi-earthquake tend to be more serious than that caused by a mainshock. In order to explore the cumulative damage of masonry structures under the mainshock-aftershock sequence, a numerical simulation of an accomplished shaking table model of a masonry structure was carried out . The reliability of the finite element model was verified by the shaking table test results. On this basis, the elastic-plastic dynamic time history analysis for the prototype structure of the shaking table test model was carried out by inputting the real mainshock-aftershock sequence. The maximum inter-story drift angle and structural damage energy dissipation were used as damage indexes to compare and analyze the influence of the mainshock-aftershock sequence on structure's cumulative damage. The results show that the structure's damage energy dissipation can reflect the structure's cumulative damage under the mainshock-aftershock sequence more sensitively; the structure's damage energy dissipation is affected by the intensity of mainshock and aftershock; the structure's damage energy dissipation ratio has a second order relationship with the mainshock intensity, and has a linear relationship with the aftershock intensity.
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