摘要
以动力文克尔梁模型为基本理论,在充分考虑了土的分层以及桩顶轴向力参与作用后导出了一种新的计算层状介质中水平动力相互作用因子的方法,进一步扩展了群桩-土相互作用简化法的应用范围,可以计算任意构型、桩数、土层属性下的群桩系统阻抗反应,其计算工作量较小,是其它数值方法难以比拟的。数值计算结果表明:桩顶轴向力的引入不能从本质上改变桩基振动形式,但考虑竖向振动附加影响的水平激振作用会产生相当的动力P-Δ效应,致使水平单、群桩阻抗效应降低,位移反应增大,同时桩间动力相互作用影响也较单一水平力作用时有明显规律性的增强。
With the participation of axial loads on pile-head in layered-soil, a method for calculating lateral dynamic interaction factors is suggested based on the Winkler-foundation beam model and the simplified scheme applied to interaction of pile-group-soil is further extended. The impedance response of pile-groups characterized by random configuration, pile number, soil properties etc can be calculated with less work than any other numerical method. The example computation indicated that the vibrating type will not change even if the axial forces is exerted, however, the corresponding dynamic P-Δ effect will engender by additional vertical oscillation which results in augments of lateral responses or the declining impedance effect of pile-groups. In addition, the influence of pile-soil-pile interaction is more enhanced than that under single horizontal vibration.
出处
《计算力学学报》
EI
CAS
CSCD
北大核心
2004年第6期757-763,共7页
Chinese Journal of Computational Mechanics
