爆炸冲击作用下节段拼装桥墩反射超压分布规律分析
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张于晔(1986—),男,副教授,博士。主要从事桥梁抗震与抗冲击研究。E-mail:zyy@njust.edu.cn

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TU443

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国家重点研发计划(2019YFE0112300);国家自然科学基金项目(52278188);江苏省自然科学基金项目(BK20211196, BK20200494)资助


Analysis on the Distribution Characteristics of Reflective Overpressure of Precast Segmental Piers under the Impact of Explosion
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    摘要:

    分析桥墩在爆炸冲击作用下的反射超压是研究其动态响应的基础。采用 ANSYS/LS‐DYNA 建立节段拼装桥墩受爆的三维实体分离式模型,并通过既有试验来验证建模方法的可靠性。以桥墩结构形式、节段数目、爆炸比例距离及爆心高度等为设计变量,分析其对节段拼装桥墩冲击波反射超压分布规律的影响。研究结果表明:爆炸冲击作用下节段拼装桥墩的反射超压分布规律与整体现浇桥墩有显著差别;在桥墩节段数目及爆心高度不变的情况下,桥墩反射超压随比例距离的减小而增大;当爆炸高度接近桥墩接缝时,接缝位置处会产生相当大的反射超压;基于分析数据,拟合得到不同比例距离爆炸作用下节段拼装桥墩和整体式桥墩反射超压分布的简化计算公式, 可为研究桥墩受爆的动态响应及其抗爆设计提供参考。

    Abstract:

    The analysis of the reflective overpressure of bridge piers under blast impact is fundamental to understanding their dynamic response. ANSYS/LS-DYNA was used to establish the three-dimensional solid-separated model of the precast segmental piers subjected to explosion, and the reliability of the modeling method has been verified by existing tests. The structural form of the piers, the number of segments, the explosion proportional distance, and the height of the detonation center on the distribution law of the reflected overpressure of precast segmental piers were analyzed in detail. The results show that the distribution of reflected overpressure of segmented bridge piers under blast impact is significantly different from that of monolithic cast-in-place piers. The reflected overpressure increases with the decrease of proportional distance when the number of segments and the detonation height of the piers are constant. When the explosion height is close to the joints of the piers, considerable reflection overpressure will be generated at the joints. The simplified calculation formulas for the reflected overpressure distribution of the precast segmental piers and the monolithic piers under the explosion at different proportional distances are obtained by fitting the analysis data. This study can provide a reference for studying the dynamic response of bridge piers and their anti-explosion design.

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张于晔,许凯,周广盼,袁万城.爆炸冲击作用下节段拼装桥墩反射超压分布规律分析[J].防灾减灾工程学报,2023,43(6):1358-1365

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  • 收稿日期:2021-04-21
  • 最后修改日期:2022-10-08
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  • 在线发布日期:2024-01-11
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