摘要
首先从轴对称角度出发,建立了弹性支承桩在桩顶受任意激振力作用下,桩土纵向耦合振动的定解问题,然后利用拉普拉斯积分变换将定解问题转换到拉氏变换域进行求解.利用桩土接触界面的位移协调条件和力的平衡条件,最终推导求解得到了基桩桩顶复阻抗、速度导纳函数的解析表达.利用所得解对桩土系统的耦合振动特性作进一步分析,并重点讨论了土层粘性材料阻尼的特殊影响,最后将理论解与现场工程桩实测曲线进行了拟合对比,两者较为一致.
The axial dynamical response of pile embedded in the soil layer with viscous type damping under arbitrary exciting force is theoretically investigated. The pile is assumed to be vertical and with elastic bottom boundary. By Laplace transformation the corresponding solution of velocity response function and complex stiffness at the pile head in frequency domain is obtained in a closed form. Based on the solution, a parametric study is conducted to determine the main features of the soilpile interaction, and the special influence of viscous damping of soil layer around pile is also discussed here. At last, it is proved that the theoretical curves are in good agreement with that obtained from the field measurement.
出处
《科技通报》
北大核心
2003年第6期442-447,451,共7页
Bulletin of Science and Technology
基金
国家自然科学基金资助项目(50279047)
关键词
工程力学
桩土耦合作用
纵向振动
粘性阻尼
频域
engineering mechanics
pile-soil interaction
vertical vibration
viscous type damping
frequency domain
