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强震作用下的桩基础动力响应特性一直是岩土工程抗震领域研究的热点问题。基于液化土中桩基振动台试验和Biot固结理论中的u-p形式公式,采用有限元软件Open Sees PL建立三维有限元模型,并进行数值模拟分析,将数值模拟结果与试验结果进行对比。结果表明:在正弦波输入下,干砂试验单桩台面、承台加速度和位移时程与模拟台面、承台加速度和位移时程从形式和数值大小上均相差不大;液化砂土试验单桩承台加速度幅值和位移与模拟承台加速度幅值和位移略有差别,但试验台面加速度和位移幅值与模拟台面加速度和位移幅值比较接近。El Centro地震波输入下也可以得到相近结论。
The dynamic response of pile foundation under strong earthquake has been a hot issue in the field of geotechnical engineering. Based on the u-p formal formula of Pile Foundation Shaking Table Test and Biot’s consolidation theory in liquefied soil, the finite element software Open Sees PL was used to establish the three-dimensional finite element model and the numerical simulation was carried out. The numerical simulation results were compared with the experimental results. The results show that under the input of sine wave, the acceleration and displacement time histories of single platform and bearing platform in dry sand test have little difference in form and numerical value with the simulation platform and bearing platform acceleration and displacement time scale. The pile cap acceleration amplitude and displacement are slightly different from the simulated cap pile acceleration amplitude and displacement, but the test bench acceleration and displacement amplitude are close to the simulated deck acceleration and displacement amplitude. El Centro seismic wave input can also be similar conclusions.