【摘要】 为揭示地震荷载作用下高桩承台斜桩基础的地震反应特性,以3种地震波(唐山波、EI波、迁安波)为例,采用三维弹塑性动力有限元技术,分析了桩身倾斜角度、自由桩长对高桩承台斜桩基础地震反应的影响规律。结果表明:各模型桩身轴力最大值均出现在冲刷线以下2.5m左右,而桩身弯矩最大值均位于承台与桩顶交界处;相同模型的左、右斜桩除竖向位移、Y方向弯矩沿桩身呈对称分布外,加速度、水平位移、轴力、总弯矩沿桩身的分布规律相同;承台高度越大,自由桩长越大,桩身轴力越大而弯矩越小;桩身倾斜度越大,其轴力与弯矩均越大,承台高度对桩身内力的影响大于桩身倾斜度;地震荷载中斜桩的加速度与位移反应降低,但轴力和弯矩增大,斜桩总弯矩主要受控于Y方向的弯矩。更多还原

【Abstract】 In order to reveal seismic behavior of batter pile group with high-rise pile cap,taking three kinds of earthquake waves as example,the effect laws of inclination angle and free pile length on seismic response were analyzed based on three-dimensional elastic-plastic dynamic finite element model.The results show that the maximum axial force of pile appears in 2.5 m approximately beneath the maximum erosion line and the maximum bending moment is located in the interface between pile cap and pile shaft.The vertical displacement and Y-orientation bending moment are symmetrically distributed along the pile shaft,and acceleration,lateral displacement,axial force,bending moment distributions along pile shaft are in the same trend.The greater free pile length,axial force of pile is larger and bending moment of pile is smaller.The greater inclination,axial force and bending moment of pile are larger.The influence on internal force is greater by the pile free length than the pile inclination.Subjected to the seismic load,acceleration and displacement of batter pile decrease,but its axial force and bending moment increase.The total bending moment of batter pile is controlled by Y-orientation bending moment.更多还原