考虑桩土动力相互作用效应时单桩水平刚度的分析

Horizontal Stiffness of Single Piles Affected by Soil Pile Dynamic Interaction

桩土动力相互作用改变了桩基的承载力，也影响了基础及上部结构对动荷载特别是地震荷载的响应，因而进行结构动力反应分析时必须考虑桩土动力相互作用的影响．以实际工程为背景，采用Ｎｏｖａｋ模型对单桩的复刚度进行近似的理论分析和计算，研究了各种因素对桩顶水平刚度的影响，指出辐射阻尼是桩土动力相互作用影响单桩复刚度的主要因素．

Piles are often used to support structures exposed to dynamic loads. The capacity of structures to resist such loads depends on the behavior of the piles which, in turn, is a product of interaction between the piles and surrounding soil. It is necessary to study soil pile dynamic interaction which affects complex stiffness of piles when response of structure to dynamic loads is analyzed. An approximate theoretical analysis and calculation were carried out based on practical situation and Novak model, and several physical factors are incorporated. This study indicates that radiation damping is the most important factor which affects horizontal complex stiffness of single piles.