超长桩基础抗震性能有限元分析

Finite Element Analysis of the Aseismatic Performance of Super Long Piled Foundation

为研究超长桩基础在地震作用下的工作性状,建立了四桩承台三维有限元计算模型.通过对超长桩基础在地震波作用下的动力分析,得出同一桩体上的不同测点的应变时程分析结果和应变、内力包络图,比较了不同地震烈度对同一超长桩基础的影响.主要结论如下:最大应变和最大弯矩均出现在距桩顶0.1L附近;桩底端的应变和弯矩最小,且地震越强弯矩越大.

In order to study super long piled foundations working properties under earthquake action,fourdimensional finite element calculation model of pile cap is established.By analyzing super long piled foundation models dynamic force under the action of seismic wave,this thesis produces the strain time history analysis chart and the strain and internal force envelope diagram of the different measure points of one pile and compares the impacts to one model brought by different seismic intensity.The conclusions from this thesis is：The maximum strain and the maximum bending moment occurs at 0.1Lfrom the pile top;At bottom of the pile,strain and bending moment are minimum,and the higher earthquake intensity the higher bending moment.