柔性承台下完全和部分埋入群桩的竖向振动及内力分析

基于简化的完全和部分埋入群桩动力计算模型,采用有限元子结构方法,提出可以考虑承台板对群桩动力阻抗贡献的计算方法,并对均质地基和层状地基中不同桩间距条件下,承台板厚度对群桩动力阻抗的影响给予分析,详细讨论承台板惯性力的变化对群桩动力特性的影响,指出刚性承台假定的局限性.然后重点研究不同承台板厚度条件下群桩内力的分布规律....

ANALYSIS FOR AXIAL VIBRATION AND INTERNAL FORCES OF TOTALLY AND PARTIALLY EMBEDDED PILE GROUPS WITH FLEXIBLE CAPS

A simplified analytical method was developed for the axial harmonic response of totally and partially embedded pile groups in homogeneous and layered soil deposits.Based on BDWF model,finite element sub-structure method was used to setup the dynamic model of cap-pile groups which could precisely simulate cap's influence on impedance of pile groups.A comprehensive parameter study was focused the influence of the caps' height and mass density on pile groups dynamic response,and then limitation of rigid cap in practical design was presented.A solution was finally presented for the internal forces distributed on pile heads due to pile-to-pile interaction.The solution of present method was compared with that of traditional simplified method(rigid and massless cap solution) in simulating an in-site experiments of totally embedded pile groups and dynamics response of partially embedded pile groups for offshore fan foundation under harmonic load,it is demonstrated that present one can predict the pile groups dynamics response more reasonable and reliable.