桩–土–上部结构动力相互作用振动台试验研究

doi:10.13722/j.cnki.jrme.2020.1196

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Abstract In order to deeply analyze the characteristics of kinematic interaction(KI) and inertial interaction(II) in seismic-soil-pile-superstructure-interaction(SSPSI)，a test model with end-bearing single pile，medium-hard clay and superstructure(variable mass) is designed and studied by shaking table test. Firstly，the motion of pile cap under different test conditions is discussed，and then the contribution of kinematic interaction and inertial interaction at the upper surface of pile cap is qualitatively explained by comparing the amplification coefficient of peak acceleration. Finally，the contribution of kinematic interaction and inertial interaction under different test conditions is further explained quantitatively by defining and calculating the coherence function ratio R. The analysis results show that the pile cap mainly moves horizontally along the vibration direction，and the contribution of rotation of the pile cap to the bending moment of the pile head is very small，which can be ignored. When there is no superstructure，or the weight of superstructure is small(37.5% and below， is the characteristic value of pile vertical bearing capacity) whereas the amplitude of ground motion is small(0.1 g and below)，the kinematic interaction is dominant. When the weight of superstructure is small(37.5% and below)，but the amplitude of ground motion is large(0.2 g)，or the weight of superstructure is large(75% and above)，the inertial interaction is dominant. Therefore，when the superstructure in SSPSI is heavy，the inertial interaction has a great impact on the horizontal bearing capacity of pile foundation，and attention should be paid to the influence of vibration characteristics of superstructure in the seismic design of pile foundation for this kind of structure.

Key words： pile foundations shaking table test SSPSI frequency response function coherence function

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	Articles by authors
	WANG Gang1
	JING Liping1
	2
	LI Jiarui1
	HE Bin1
	YIN Zhiyong1

Cite this article:

WANG Gang1,JING Liping1,2, et al. Shaking table test study on seismic-soil-pile-superstructure-interaction[J]. , 2021, 40(S2): 3414-3424.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.1196 OR http://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3414

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