跨断层简支钢箱梁桥的概率性地震损伤特性研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (15) : 253-262.

论文

江辉1,2，张鹏3，黄磊1，曾聪1

作者信息 +

Probabilistic seismic damage characteristics of simply supported steel box girder bridge across fault

JIANG Hui1,2, ZHANG Peng3, HUANG Lei1, ZENG Cong1

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文章历史 +

摘要

以跨越走滑断层的简支钢箱梁桥为对象，同时考虑地震动和结构参数不确定性的影响，开展全桥结构在非一致激励下的增量动力分析，深入讨论了跨断层桥梁桥墩的概率性地震损伤特性。结果表明，结构参数不确定性的影响随着地震动增强而变大；对于紧邻断层桥墩，当断层滑冲强度为78.0 cm时，完全破坏的超越概率由均值模型的7.53%增大到随机模型的13.01%，说明强震下如不考虑结构参数不确定性的影响可能会低估结构的易损性。紧邻断层桥墩面临更高的地震损伤概率，当断层滑冲强度为52.0 cm时，四种损伤状态下非紧邻断层墩的超越概率分别为97.54%、88.51%、2.42%和0.06%，而紧邻断层墩分别为99.24%、99.15%、6.50%和0.28%。因此，应对跨断层桥梁紧邻断层桥墩的抗震设计予以更多关注，开展针对性抗震设计。

Abstract

Taking a simply supported steel box girder bridge across strike slip fault as the study object, simultaneously considering effects of uncertainty of ground motion and structural parameters, the incremental dynamic analysis (IDA) of the whole bridge structure under non-uniform excitation was performed, and probabilistic seismic damage characteristics of bridge piers across fault were deeply discussed. The results showed that effects of structural parametric uncertainty increase with increase in ground motion intensity; for pier adjacent to fault, when slip thrust strength of fault is 78.0 cm, the exceeding probability of complete failure rises from 7.53% of the mean model to 13.01% of the random model, so the vulnerability of the structure may be underestimated if not considering effects of structural parametric uncertainty under strong earthquake; when slip thrust strength of fault is 52.0 cm, exceedance probabilities of pier not adjacent to fault are 97.54%, 88.51%, 2.42% and 0.06%, respectively under four damage states, while those of pier adjacent to fault are 99.24%, 99.15%, 6.50% and 0.28%, respectively, so more attention should be paid to aseismic design of bridge piers adjacent to fault and targeted aseismic design should be performed.

导出引用

江辉，张鹏，黄磊，曾聪. 跨断层简支钢箱梁桥的概率性地震损伤特性研究[J]. 振动与冲击, 2021, 40(15): 253-262

JIANG Hui, ZHANG Peng HUANG Lei, ZENG Cong. Probabilistic seismic damage characteristics of simply supported steel box girder bridge across fault[J]. Journal of Vibration and Shock, 2021, 40(15): 253-262

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