| 强震作用下桩-土-断层非线性动力相互作用特性 |
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| 引用本文： | 冯忠居,关云辉,赖德金,董芸秀,孟莹莹,张聪.强震作用下桩-土-断层非线性动力相互作用特性[J].世界地震工程,2021,0(4):167-176. |
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| 作者姓名： | 冯忠居 关云辉 赖德金 董芸秀 孟莹莹 张聪 |
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| 作者单位： | 1. 长安大学 公路学院, 陕西 西安 710064;2. 厦门路桥工程投资发展有限公司, 福建 厦门 361026;3. 陇东学院 土木工程学院, 甘肃 庆阳 745000 |
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| 摘 要： | 为研究强震区跨断层桥梁桩基非线性动力相互作用特性，依托海文大桥实体工程，利用MIDAS/GTS有限元软件，建立了桩-土-断层相互作用模型，分析0.20~0.60g地震动强度下断层上下盘桩基加速度响应、桩顶水平位移、桩身弯矩以及桩身剪力响应情况。结果表明:覆盖层土体对桩身加速度放大作用明显，且随着输入地震动强度的增大，放大作用逐渐减弱；覆盖层对地震波的滤波作用显著，随着输入地震动强度的增大，滤波作用逐渐减弱；上盘桩基达到桩顶峰值加速度的时刻滞后于下盘；随着输入地震动强度的增大，上、下盘桩的桩顶产生的永久位移和水平位移峰值逐渐变大，上盘桩顶产生的永久位移和桩顶峰值位移均大于下盘，产生显著的"上盘效应"；不同强度地震动作用下，断层上、下盘桩基弯矩均在上部土层界面处达到峰值，剪力均在基岩面处达到峰值，下盘桩基弯矩和剪力峰值大于上盘桩基，呈现出显著的"下盘效应"。在桥梁桩基抗震设计时，应着重考虑断层上、下盘桩基的差异和不同强度地震作用对桩基承载特性的影响。
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| 关 键 词： | 岩土工程 动力相互作用 数值仿真 跨断层桥梁桩基 强震区 |
Nonlinear dynamic interaction characteristics of pile-soil-fault under strong earthquake |
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| FENG Zhongju,GUAN Yunhui,LAI Dejin,DONG Yunxiu,MENG Yingying,ZHANG Cong.Nonlinear dynamic interaction characteristics of pile-soil-fault under strong earthquake[J].World Information On Earthquake Engineering,2021,0(4):167-176. |
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| Authors: | FENG Zhongju GUAN Yunhui LAI Dejin DONG Yunxiu MENG Yingying ZHANG Cong |
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| Affiliation: | 1. School of Highway, Chang’an University, Xi’an 710064, China;2. Xiamen Road&Bridge Engineering Investment and Development Co., Ltd., Xiamen 361026, China;3. School of Civil Engineering, Longdong University, Qingyang 745000, China |
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| Abstract: | In order to study the nonlinear dynamic interaction characteristics of pile foundation of cross-fault bridge in strong earthquake area, relying on the actual engineering situation of the Haiwen Bridge, a pile-soil-fault interaction model is established by using MIDAS/GTS finite element software.The acceleration response of pile foundation, horizontal displacement of pile top, bending moment and shear response of pile under 0.20g~0.60g ground motion are analyzed. The results show that the magnifying effect of the overburden soil on the acceleration of the pile body is obvious, and the amplification effect decreases gradually with the increase of the input ground motion intensity, and the filtering effect is obvious with the increase of the input ground motion intensity. The filtering effect is gradually weakened, and the time when the pile foundation reaches the peak acceleration at the top of the pile lags behind that of the lower wall.With the increase of the input ground motion intensity, the peak values of permanent displacement and horizontal displacement of the pile top of the upper and lower piles gradually increase, and the permanent displacement and the peak displacement of the pile top of the upper pile are larger than those of the lower pile, resulting in a significant "upper wall effect".Under the action of different intensity ground motion, the bending moment of the upper and lower wall pile foundation of the fault reaches the peak at the interface of the upper soil layer, and the shear force reaches the peak value at the bedrock surface, and the peak value of bending moment and shear force of the lower wall pile foundation is larger than that of the upper wall pile foundation, showing a significant "footwall effect".In the seismic design of bridge pile foundation, the difference between upper and lower wall pile foundation of fault and the influence of seismic action of different intensity on the bearing characteristics of pile foundation should be taken into account. |
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| Keywords: | geotechnical engineering dynamic response numerical simulation cross-fault bridge pile foundation strong earthquake area |
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