桩筏基础振动台试验设计及数值模拟研究

Shaking Table Test Design and Numerical Simulation of Pile-Raft Foundation

为了研究某核电工程桩筏基础抗震性能,设计缩尺筏基振动台实验。试验模型使用ABAQUS软件进行数值模拟以验证试验设计方案的可行性。依托该实际工程,实验缩尺比例为1/200。地震波选用国内外核电厂结构相关技术文件和规范规定,采用R.G1.60标准反应谱拟合的人工波进行输入计算。结果表明:桩间土输出加速度越往模型上部越大;桩顶部位移比桩低部大;筏板加速度与位移均小于桩体。分析成果可为振动台试验的改进提供指导并为实际工程设计提供参考。

A shaking table experiment was designed to study the seismic performance of the pile–raft foundation of a nuclear power project.Numerical simulation was carried out with ABAQUS software to verify the feasibility of the test design scheme.The scale of the experiment was set as 1:200 based on the actual project.Seismic waves were selected from the relevant technical documents and specifications of nuclear power plant structure at home and abroad.Artificial waves fitted by R.G1.60 standard response spectrum were inputted to calculate the case.Results show that the displacement at the top of pile is larger than that at the bottom of pile.The acceleration and displacement of the raft are smaller than those of the pile.This study provides guidance for the improvement of the shaking table test and reference for practical engineering design.