Three-dimensional finite element analyses of clay-pile-pier systems subjected to seismic motions

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Journal of Vibration and Shock ›› 2021, Vol. 40 ›› Issue (23) : 109-119.

ZHANG Lei, ZHOU Teng, RUI Rui, ZHANG Panpan

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Abstract

Numerous studies have shown that the interaction between soft clay and underground structure is significant, and soft clays have a significant amplification effect on seismic waves. As a result, the seismic performances of structures built in or on soft clay deposits are largely unassured. In this study, three-dimensional finite element analyses using an explicit integration algorithm were performed to investigate the seismic response of clay-pile-pier systems. The stiffness degradation and hysteretic damping of soft clays were taken into account by adopting a hyperbolic-hysteresis soil model, and the elasto-plastic behavior of the bridge structure elements was also considered. The effects of some important factors, such as peak base acceleration (PBA), flexural rigidity, and bridge gird mass, on the seismic response of soft clay-pile-pier systems were examined. For the three sets of far-field seismic motions considered, the bending moment responses of the clay-pile-pier systems generally had the comparable trends with each of the factors considered; when the bridge structure was still in the elastic deformation stage, because of the nonlinear dynamic behavior of the clay and the complexity of the dynamic clay-pile interaction, the seismic responses of the pile-pier system were generally nonlinear, regardless of the types of the earthquake and the factors considered. However, when plastic deformation of the bridge structure was induced, the bending curvatures of both pile and pier became evidently different among the three different sets of ground motions, indicating that the seismic damage evolution pattern of the pile-pier system was highly dependent on the earthquake type and the related frequency-spectrum characteristic. Among the three factors considered, PBA had the most significant influence on the seismic response of the whole system, and bridge gird mass and pile flexural rigidity respectively had relatively larger influences on the seismic responses of pier and pile, suggesting that the seismic responses of pier and pile were predominantly dependent on the inertial and kinematic forces during the seismic shakings, respectively. Furthermore, it was found that there was a critical pile flexural rigidity, beyond which the maximum pile curvature became relatively unchanged. The findings obtained from the present study may serve as a useful reference for evaluating the seismic performance of a similar clay-pile-pier system.

Key words

pile foundation / soft clay / soil-structure interaction / earthquake / maximum bending moment / bending curvature

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ZHANG Lei, ZHOU Teng, RUI Rui, ZHANG Panpan. Three-dimensional finite element analyses of clay-pile-pier systems subjected to seismic motions[J]. Journal of Vibration and Shock, 2021, 40(23): 109-119

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