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。
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.
出处
《振动与冲击》
EI
CSCD
北大核心
2017年第3期20-26,共7页
Journal of Vibration and Shock
基金
国家自然科学基金(51475287)
国家高技术研究发展计划(863)项目(2012AA01A307)
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
soil-pile dynamic interaction
seismic response
non-reflecting boundary
penalty function method
numerical simulation
