| 明代石拱桥永昌桥的动力特性及其抗震性能分析 |
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| 引用本文： | 马宇坤,淳庆.明代石拱桥永昌桥的动力特性及其抗震性能分析[J].华侨大学学报(自然科学版),2023,0(3):336-345. |
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| 作者姓名： | 马宇坤 淳庆 |
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| 作者单位： | 东南大学 建筑学院, 江苏 南京 210096 |
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| 基金项目： | 国家自然科学基金资助项目（52078111）； |
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| 摘 要： | 为研究明代三孔石拱桥的抗震性能，建立永昌桥的三维有限元模型，并分析其动力特性、振型分解反应谱和地震时程，得出固有频率、模态振型、地震作用效应、地震位移，以及地震应力响应.结果表明：三孔石拱桥的第3阶扭转振型频率与前两阶平动振型频率相差不大；在抗震设防烈度为7度、E1和E2地震作用下，三孔石拱桥受力最危险的是雁翅桥台与次孔拱券交接处、分水尖与次孔拱券交接处，其他拱脚、拱券和拱顶桥面也易发生拉裂破坏.
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| 关 键 词： | 明代三孔石拱桥 动力特性 抗震性能 抗震加固 永昌桥 |
Analysis of Dynamic Characteristics and Seismic Performance of Yongchang Stone Arch Bridge in Ming Dynasty |
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| MA Yukun,CHUN Qing.Analysis of Dynamic Characteristics and Seismic Performance of Yongchang Stone Arch Bridge in Ming Dynasty[J].Journal of Huaqiao University(Natural Science),2023,0(3):336-345. |
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| Authors: | MA Yukun CHUN Qing |
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| Affiliation: | School of Architecture, Southeast University, Nanjing 210096, China |
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| Abstract: | In order to study the seismic performance of the 3 holes stone arch bridge in Ming Dynasty, a 3-dimensional finite element model of Yongchang Bridge was established, and its dynamic characteristics, mode decomposition response spectrum and seismic time history were analyzed. The natural frequency, mode shape, seismic action effect, seismic displacement, and seismic stress response were obtained. The results show that there is little difference between the 3rd torsional mode frequency and the 1st-2nd translational mode frequencies of the 3 holes stone arch bridge. Under the E1 and E2 seismic action with the 7 degrees seismic fortification intensity, the most dangerous force parts of the 3 holes stone arch bridge are the junction of the wild goose wing abutment and the secondary arch, and the junction of the water diversion tip and the secondary arch. Other arch feet, arches and arch crown decks are also vunerable to tensile damage. |
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| Keywords: | 3 holes stone arch bridge in Ming Dynasty dynamic characteristic seismic performance seismic strengthening Yongchang Bridge |
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