Numerical simulation on the seismic absorption effect of the cushion in rigid-pile composite foundation |
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Authors: | Xiaolei Han Yaokun Li Jing Ji Junhao Ying Weichen Li Baicheng Dai |
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Affiliation: | 1.School of Civil Engineering and Transportation,South China University of Technology,Guangzhou,China;2.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou,China;3.Yangjiang Power Supply Bureau of China Southern Power Grid,Yangjiang, Guangdong,China |
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Abstract: | In order to quantitatively study the seismic absorption effect of the cushion on a superstructure, a numerical simulation and parametric study are carried out on the overall FEA model of a rigid-pile composite foundation in ABAQUS. A simulation of a shaking table test on a rigid mass block is first completed with ABAQUS and EERA, and the effectiveness of the Drucker-Prager constitutive model and the finite-infinite element coupling method is proved. Dynamic time-history analysis of the overall model under frequent and rare earthquakes is carried out using seismic waves from the El Centro, Kobe, and Bonds earthquakes. The different responses of rigid-pile composite foundations and pile-raft foundations are discussed. Furthermore, the influence of thickness and modulus of cushion, and ground acceleration on the seismic absorption effect of the cushion are analyzed. The results show that: 1) the seismic absorption effect of a cushion is good under rare earthquakes, with an absorption ratio of about 0.85; and 2) the seismic absorption effect is strongly affected by cushion thickness and ground acceleration. |
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