地震激励下桩-土非线性耦合作用对桩基动力响应特性的影响

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摘要为探讨桩-土非线性耦合作用对桩基动力响应特性的影响，以桩-土-结构耦合系统为研究对象，建立三维非线性有限元模型，采用Drucker-Prager非线性土体本构模型，利用罚函数法实现桩-土-结构界面间的非线性耦合作用，引入无反射边界条件，并考虑重力因素，得到了水平和竖直方向组合地震激励下桩-土非线性相互作用对桩基地震响应的影响。结果表明：考虑桩-土接触非线性，桩基的加速度响应峰值减小，桩土之间出现明显的分离现象，桩基剪力和弯矩峰值有所增加；通过对桩基轴力的校核，桩基不承受拉力，不会发生拔桩现象。

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	罗川
	占昌宝 1
	楼云锋 1
	金先龙 1
	丁振坤 2

关键词 ：桩-土动力相互作用, 地震反应, 无反射边界, 罚函数法, 数值计算

Abstract：The dynamic response features of pile foundations with soil-pile nonlinear coupling actions were investigated by conducting nonlinear 3D finite element numerical simulations. The soil-pile nonlinear coupling actions, such as, non-reflecting boundary condition and soil-pile dynamic interaction were modeled with the penalty function method. The simulation results showed that considering the nonlinearity of soil-pile contact, the peak acceleration of pile foundation decreases; the obvious phenomenon of separation between soil and piles appears; the shear force and bending moment increase due to soil-pile nonlinear interaction; there is no axial tensile force in piles.

Key words： soil-pile dynamic interaction seismic response non-reflecting boundary penalty function method numerical simulation

收稿日期: 2015-10-10 出版日期: 2017-01-25

引用本文:

罗川,占昌宝 1，楼云锋 1，金先龙 1，丁振坤 2. 地震激励下桩-土非线性耦合作用对桩基动力响应特性的影响[J]. 振动与冲击, 2017, 36(3): 20-26.
LUO Chuan1,ZHAN Changbao1,LOU Yunfeng1,JIN Xianlong1,DING Zhenkun2. Effects of pile-soil nonlinear coupling actions on dynamic response features of pile foundation under earthquake. JOURNAL OF VIBRATION AND SHOCK, 2017, 36(3): 20-26.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2017/V36/I3/20

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