摘要
基于回传射线矩阵法,求得单位脉冲作用下均质土中部分埋入任意段变模量桩的桩顶速度导纳,利用Fourier逆变换和卷积定理得到瞬态半正弦激振力作用下的桩顶时域速度响应。比较部分埋入变模量桩与部分埋入完整桩的桩顶速度导纳和反射波,分析缺陷长度和埋深、缺陷程度和脉冲持续时间对部分埋入变模量桩桩顶速度导纳和反射波的影响。结果表明:部分埋入变模量桩的反射波有延迟现象,缺陷长度和程度影响速度导纳曲线中波峰波谷对应的频率值,缺陷埋深对其没有影响。
Based on the method of reverberation-ray matrix, the velocity mobility at the top of pile with arbitrary variable modulus, which is embedded partially in homogeneous soil and is under the excitation of unit delta time force, is derived. The time velocity response at the pile top is further obtained by inverse Fourier transform and convolution theorem acted by a halfsine impulse. The velocity mobility and reflecting waves of perfect pile and the pile with variable modulus embedded partially in homogeneous soil are compared. The effect of defective type, defective length, defective location, defective degree, and impulse duration on velocity mobility and reflecting wave at the pile top are further analyzed. It is shown that there is delay phenomenon in reflecting wave of the pile with variable-modulus, defective length and degree have great effect on the corresponding frequency value of wave crest and trough of velocity mobility, and defective location has no effect upon it.
出处
《振动工程学报》
EI
CSCD
北大核心
2010年第2期200-205,共6页
Journal of Vibration Engineering
基金
教育部科学技术研究重点项目资助(208150)
兰州交通大学"青蓝"人才工程基金资助(QL0507A)
关键词
部分埋入变模量桩
均质土
回传射线矩阵法
瞬态波动
速度导纳
the pile with variable modulus embedded partially in soil
homogeneous soil
reverberation-ray matrix method
transient wave
velocity mobility
