Dynamic response of pile foundation under horizontal resonant vibratory loads

According to the inescapability dynamic functions of bridge pile foundation in the construction and operation processes,and based on considering axial forces and horizontal forces co-operation in pile top,the horizontal vibratory loads can be simplified as resonant vibratory loads.Based on the dynamic Winkler found model and through simplifying soils as independent springs and dampers,the horizontal vibration equation can be established and the horizontal nonlinear dynamic response of pile foundation can be solved.Considering the pile-soil interaction and transmitting boundary,the finite element method was introduced to establish two dimensional nonlinear dynamic models.The design parameters are analyzed;and the calculation results show that the displacement variation in pile top is hump shape with load frequency change and the values increase with the amplitude enlargement.The natural frequency of pile foundation increases with the increase of pile length-diameter ratio and decreases with increase of pile-soil modulus ratio.The enlargement of pile diameter can increase pile stress and the stability of pile foundation is strengthened with deformation reduction.