（河南大学土木建筑学院， 开封 475001）

［摘要］建立超长桩四桩-承台三维有限元模型，采用时程分析法研究了不同地震波作用下，超长桩基础的抗震性能；根据相似理论，设计并制作几何比例为1∶40的四桩-承台超长桩基础模型，埋入砂箱，进行砂箱拟动力试验，研究了地震作用下桩体响应规律，并对其在两种方法下得出的结果进行对比分析。结果表明：桩体的最大剪力均发生在桩顶，而最大弯矩则出现在桩顶附近处，桩端剪力和弯矩最小；地震波作用下桩身的剪力和弯矩最大值随震级的增大而增大。超长桩基础承台和桩顶紧刚性连接形成整体，有利于抵抗地震作用，同时桩周土体产生的侧摩阻力也对桩身的受力及变形发挥一定阻止作用，通过观察试验现象、分析试验和理论数据可见超长桩基础具有良好的抗震性能。

［关键词］超长桩基础； 有限元； 时程分析； 拟动力试验； 地震响应

中图分类号： TU473.1    文献标识码： A    文章编号： 1002-848X(2015)S2-0232-03 

Research on seismic performance of super long pile foundation

Bao Peng, Han Xuehang, Wang Meng, Gui Song, Geng Zhaohui

(School of Civil Engineering and Architecture, Henan University, Kaifeng 475001, China)

Abstract: A super long four-pile-caps three dimensional finite element model was built by time history analysis method to study seismic performances of the long pile foundation under different seismic waves. According to the similarity theory, four-super long pile-caps pile foundation model of geometric proportion of 1∶40 was designed and made, then it was buried in sand box for sand box pseudo-dynamic test to study the response of piles under earthquake and make comparative analysis of their results of the two methods. The results show that all maximum shears occur on the top of the pile, while the maximum bending moment occurs near the top of the pile and the minimum shear and moment occurs on the tip of pile. Maximum shear and moment of pile increases with the increasing magnitude under the seismic waves. The pile caps of the super long pile foundation tightly connect to the pile top, conducive to resisting earthquakes, while the lateral friction generated by the soil around pile also prevent the stress and deformation of the pile. Through observing the trial, analyzing the experimental and theoretical data, it shows that super long pile foundation has a good seismic performance.

Keywords: super long pile foundation; finite element; time history analysis; pseudo-dynamic testing; seismic response

作者简介：鲍鹏，博士，教授，Email:cnbaop@aliyun.com。