动力荷载作用下桩基有限元分析
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摘要
混凝土灌注桩是一种广泛采用的桩基础形式。历次世界大地震中,均出现了各类桩基础的严重破坏现象。针对在强震作用下的桩基础非线性地震反应问题,利用大型有限元软件ANSYS,建立了桩-土-承台动力相互作用的三维有限元模型,同时在桩-土接触面上设置接触单元模拟桩-土间的接触非线性,对在水平地震波和竖向荷载作用下的桩-土-承台体系的相互作用机理进行了分析与探讨。结果表明:土体受静止、地震波动载荷的共同作用下水平位移随着地震动力波的正反方向变化而不断改变其位移影响范围,而桩体的竖向位移在沿桩顶到桩底范围内都有不同程度的影响。
Concrete pile is a widely used form of foundation.During previous earthquakes,there have been serious damages happened in kinds of pile foundation.In this paper,under the action of the earthquake non-linear seismic response of pile foundations,using finite element software ANSYS,a pile-soil-cap interaction of three-dimensional dynamic finite element is established,while pile-soil contact surface contact element is set to simulate the non-linear of pile-soil contact.The pile-soil-cap interaction mechanism is analyzed and discussed under horizontal and vertical seismic loads.The results showed: under static and seismic load the horizontal displacement of the soil fluctuates together with the seismic waves,while the vertical displacement of pile along the top to the bottom have changed.
Concrete pile is a widely used form of foundation.During previous earthquakes,there have been serious damages happened in kinds of pile foundation.In this paper,under the action of the earthquake non-linear seismic response of pile foundations,using finite element software ANSYS,a pile-soil-cap interaction of three-dimensional dynamic finite element is established,while pile-soil contact surface contact element is set to simulate the non-linear of pile-soil contact.The pile-soil-cap interaction mechanism is analyzed and discussed under horizontal and vertical seismic loads.The results showed: under static and seismic load the horizontal displacement of the soil fluctuates together with the seismic waves,while the vertical displacement of pile along the top to the bottom have changed.
引文
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