均匀土中有限长桩瞬态横向动力响应

解析地研究了桩顶受到横向冲击荷载时桩的瞬态横向动力响应。把桩身当作Bernoulli-Euler梁,桩周土当作Winkler地基。由Laplace正变换和反变换分别得到桩土系统的传递函数和单位脉冲响应。进一步得到桩顶横向振动速度的频响函数、频域和时域表达式。对桩的横向动力响应和轴向动力响应进行了对比研究;研究了桩长、桩周土剪切波速和桩顶横向激振力作用时间对桩的瞬态横向动力响应的影响;还研究了桩中弯曲波的衰减。

TRANSIENT LATERAL RESPONSE OF A FINITE PILE IN HOMOGENEOUS SOIL

Transient lateral response of pile subjected to lateral impulse load at the pile head is studied. The pile is assumed to be a Bernoulli-Euler beam of finite length, and the soil around the pile is treated as Winkler foundation. Transfer function and response to unit pulse are derived by direct and inverse Laplace transforms, respectively. Frequency response function, frequency-domain and time-domain expressions for the lateral vibration velocity at the pile head are obtained. The transient lateral response of the pile is compared with the transient axial one. The effects of the pile length, the velocity of shear wave of the soil and the duration of lateral impulse load at the pile head on the transient lateral dynamic response are investigated. The attenuation factor of flexural wave in the pile is also analyzed.