| 远场类谐和地震作用下双柱墩梁桥失效分析 |
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| 引用本文： | 颜桂云、余勇胜、袁宇琴、李环辉、张东鹏.远场类谐和地震作用下双柱墩梁桥失效分析[J].福建工程学院学报,2021,0(4):307-314. |
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| 作者姓名： | 颜桂云、余勇胜、袁宇琴、李环辉、张东鹏 |
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| 作者单位： | 福建工程学院土木工程学院 |
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| 摘 要： | 根据远场类谐和地震动、普通地震动反应谱与规范反应谱之间的包络关系，选取输入结构的地震动加速度峰值?建立双柱墩式抗震梁桥，分析同峰值加速度的远场类谐和地震动和普通地震动作用下双柱墩式梁桥主梁、墩柱的地震响应等，揭示远场类谐和地震动作用下双柱墩式梁桥的动力响应与失效机理?采用SR模型模拟双柱墩抗震梁桥墩底的SSI效应，分析远场类谐和地震动作用下梁桥地震响应变化规律。结果表明，远场类谐和地震动对桥梁的地震响应为普通地震动作用的1.5倍以上，其设防烈度至少应提高一度才能保证桥梁的安全?墩-系梁连接点处弯矩随桩土刚度减小而增大，有可能会引起桥墩弯曲破坏。
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| 关 键 词： | 远场类谐和地震动 双柱墩 失效机理 SSI 效应 |
Failure mechanism of double-column pier beam bridge under far-field harmonic-like ground motions |
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| YAN Guiyun,YU Yongsheng,YUAN Yuqin,LI Huanhui,ZHANG Dongpeng.Failure mechanism of double-column pier beam bridge under far-field harmonic-like ground motions[J].Journal of Fujian University of Technology,2021,0(4):307-314. |
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| Authors: | YAN Guiyun YU Yongsheng YUAN Yuqin LI Huanhui ZHANG Dongpeng |
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| Institution: | Fujian Provincial Key Laboratory of Advanced Technology and Information in Civil Engineering,School of Civil Engineering, Fujian University of Technology |
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| Abstract: | According to the envelope relationship between the code response spectrum and the far-field harmonic-like and ordinary seismic response spectrum, the peak value of seismic acceleration of input structures was selected. A double-column pier seismic beam bridge was established and analysis was made of the seismic response of the main beam and pier-column of the double-column pier beam bridge under the action of far-field harmonic-like and ordinary ground motions with the same peak acceleration, so as to reveal the dynamic response and failure mechanism of double-column pier beam bridge under the action of far-field harmonic-like ground motions. The SSI effect of the bottom of the two-pillar anti-seismic beam bridge was simulated by the SR model, and the change law of seismic response of the bridge was analyzed under the effect of far-field harmonic-like ground motions. Results show that the seismic response of the far-field harmonic-like ground motions to the bridge is more than 1.5 times that of the ordinary earthquake, so the fortification intensity needs to be at least one degree higher than the ordinary earthquake to ensure the safety of the bridge. The bending moment at pier-beam connection point increases with the decrease of pile-soil stiffness, which may cause bending failure of the pier. |
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| Keywords: | far-field harmonic-like ground motions double-column piers failure mechanism SSI effect |
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