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Title:: Comparative Analysis of Pile-soil Dynamic Response Test and Numerical Simulation Based on OpenSees

作者:: 李雨润¹; 杨皓天¹; 梁艳²; 赵青山³; (1.河北工业大学土木与交通学院,天津 300401; 2.河北工业大学校园建设与管理处,天津 300401; 3.河北拓为工程设计有限公司,河北廊坊 065000)

Author(s):: LI Yurun¹; YANG Haotian¹; LIANG Yan²; ZHAO Qingshan³; (1.School of Civil and Transportation Engineering,Hebei University of Technology,Tianjin 300401,China)(2.Campus Construction and Management,Hebei University of Technology,Tianjin 300401,China)(3.Hebei Tuowei Engineering Design Company Limited,Langfang 065000,Hebei,China)

Keywords:: the OpenSees finite element software; straight and inclined group piles; dynamic response; pore water pressure; numerical simulation

摘要:: 地震作用下桩土的相互作用一直都是抗震研究中的热点问题。基于2×2直、斜群桩振动台试验,利用OpenSees有限元软件进行不同频率正弦波输入下直、斜群桩的动力响应对比分析。结果表明:在正弦波作用下、直、斜群桩承台位移与加速度均被放大; 随着输入正弦波频率的增大,承台位移与加速度放大倍数均表现出增长趋势,并且直群桩承台的放大倍数大于斜群桩; 对于正弦波输入下的非液化砂土和饱和砂土的直、斜群桩工况,振动过程中土样的液化速度与输入正弦波频率成正相关。通过OpenSees软件进行数值模拟的计算结果与振动台试验结果吻合较好,验证了液化土中直、斜群桩动力响应数值模型的正确性。

Abstract:: The interaction between pile and soil under seismic action has always been a hot topics in the seismic research of geotechnical engineering.Based on vibration Tab.test of 2×2 straight and inclined group piles,the OpenSees finite element software is used to compare and analyze the dynamic response of straight and inclined group piles under different frequency sine wave input in this paper.The results show that under the action of sine wave,the displacement and acceleration of the pile caps are amplified in both the straight and the inclined group piles.With the increase of the frequency of input sine wave,magnification times of the displacement and acceleration show an increasing trend,and the magnification times of the pile cap under the condition of straight group piles is greater than that of the inclined group piles.With the input of sine wave,the liquefaction velocity of soil samples is positively correlated with the frequency of input sinusoidal wave during the vibration process of straight and inclined group piles in nonliquefied sand and saturated sand.The result of numerical simulation by OpenSees is in good agreement with the result of shaking Tab.test,which verifies the correctness of the numerical model of dynamic response of straight and inclined group piles in liquefied soil.