The Analysis Of Feedback Effect On The Pile Foundation By The Slender Structure Under Earthquake

As a fundamental form with long history, pile foundation is used wildly in today's construction projects. However, the damage of pile foundation is not obvious in the earthquake and it will be a hard work and costs a lot to repair it. Pile - soil - structure system under earthquake motion, both as a whole together, and interact in the course of the campaign, during which Turkey and the upper body structure of the campaign to free inertial feedback contribute largely to the pile Damage. There is an urgent need to study the dynamic response of pile of different sites and different upper structure of the feedback on the pile, and then guide the seismic design of pile foundation.This paper a theoretical analysis and numerical simulation of two aspects of work. In the theoretical analysis: for countries in recent years, research achievements, summed up the pile - soil - structure interaction of the major issues, research tools and research, focusing on theoretical research methods, and the role of the upper structure in the earthquake Feedback effect on the pile under analyzed; the numerical simulation: theoretical analysis based on numerical methods of the theory, the use of large-scale general-purpose finite element software Adina8.5.0 established different upper structure, different pile aspect ratio, different pile type of finite element model in the earthquake of pile - soil - structure interaction numerical simulation. Research methods, including modal analysis, natural frequency analysis, comparative analysis of the maximum displacement, displacement time history analysis, acceleration analysis and stress analysis.After the above two tasks, initially obtained a slender structures under earthquake pile of feedback on the law: slender structures due to the particularity of the form, under the earthquake, the dynamic response of great uncertainty , And along with seismic time increases, the feedback effect of the inertia of the pile will be different because of structural forms vary significantly; pile in the upper structure of the feedback, the destruction of more concentrated in the junction of post and cap ; the same conditions, the seismic performance of circular pile is better than square piles; for the aspect ratio, there exists an optimal seismic performance of pile foundation can make the best, and seismic performance of pile length is not a simple proportional relationship.