Study on Seismic Response of the Bridge Pile Foundation Under Horizontal-Vertical Earthquake Action
Based on the finite difference software FLAC 3D,a 3D numerical analysis model of the site-pile-structure system was established;Then,when the SANISAND liquefiable soil constitutive was applied in the loose sand layer and the Mohr-Coulomb constitutive was applied in the dense sand layer,the reliability of numerical analysis model was verified by comparing the numerical results with the centrifuge test results;Finally,the horizontal one-way and horizontal and vertical coupling Kobe seismic waves were selected to analyze the pore pressure,acceleration,dis-placement,and bending moment of the pile,etc.The effect of vertical seismic action on the seismic response of pile foundation was further investigated.The results show that:1)The existence of the vertical seismic action increases the acceleration response of the soil and exacerbate the oscillations of the pore pressure;2)Compared with the hori-zontal single-direction seismic,the difference in soil displacement of the loose sand layer under horizontal and ver-tical two-way earthquakes are more significant,which may be related to the fact that the bond between the soil par-ticles of the loose sand layer is more likely to be weakened under the vertical seismic action;3)The vertical seismic action increases the bending moment response of the pile and reaches the maximum at the interface of the soil layer,which is prone to the bending damage of the pile.The above conclusions can provide a reference for future consider-ation of reinforcement construction of vulnerable parts of bridge pile foundations under the vertical seismic action.
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