考虑桩身材料阻尼的桩基纵向振动积分变换解及其应用
发布时间：2018-08-14 19:50
【摘要】：通过积分变换法,对考虑桩身材料阻尼条件下的桩基纵向振动问题进行求解,并得到了桩 土系统的传递函数以及脉冲响应函数。通过脉冲响应函数与外部激振函数在时域内卷积,可以得到任意激振条件下,桩顶位移(速度)响应的时域解析解,解决了分离变量法由于解法局限性只能对稳态正弦激振响应进行求解的不足,大大提升了解的适应性。并对工程测试中可能出现的测试信号高频干扰问题进行了波形分析,由于桩阻尼的存在,测试信号中的高频干扰成分所对应的响应会自动滤去,同时低频成分对应后继反射波趋于"宽扁"型。当桩阻尼较大时,反射波的起跳位置发生改变,不能作为一维弹性波速的测试依据。
[Abstract]:The problem of longitudinal vibration of pile foundation under the condition of pile material damping is solved by integral transformation method, and the transfer function and impulse response function of pile-soil system are obtained. By convolution of impulse response function and external excitation function in time domain, the analytical solution of displacement (velocity) response of pile top in time domain can be obtained under arbitrary excitation condition. The problem that the method of separating variables can only solve the steady-state sinusoidal vibration response due to the limitation of the method is solved, which greatly improves the adaptability of the solution. The waveform analysis of the high frequency interference problem of the test signal which may appear in the engineering test is carried out. Because of the existence of pile damping, the response corresponding to the high frequency interference component in the test signal will be filtered out automatically. At the same time, the low frequency corresponding to the subsequent reflection wave tends to be "wide flat". When the pile damping is large, the take-off position of the reflected wave changes, which can not be used as the measurement basis of the one-dimensional elastic wave velocity.
【作者单位】： 浙江大学滨海和城市岩土工程研究中心;浙江大学软弱土与环境土工教育部重点实验室;
【分类号】：TU473.1
本文编号：2183943
[Abstract]:The problem of longitudinal vibration of pile foundation under the condition of pile material damping is solved by integral transformation method, and the transfer function and impulse response function of pile-soil system are obtained. By convolution of impulse response function and external excitation function in time domain, the analytical solution of displacement (velocity) response of pile top in time domain can be obtained under arbitrary excitation condition. The problem that the method of separating variables can only solve the steady-state sinusoidal vibration response due to the limitation of the method is solved, which greatly improves the adaptability of the solution. The waveform analysis of the high frequency interference problem of the test signal which may appear in the engineering test is carried out. Because of the existence of pile damping, the response corresponding to the high frequency interference component in the test signal will be filtered out automatically. At the same time, the low frequency corresponding to the subsequent reflection wave tends to be "wide flat". When the pile damping is large, the take-off position of the reflected wave changes, which can not be used as the measurement basis of the one-dimensional elastic wave velocity.
【作者单位】： 浙江大学滨海和城市岩土工程研究中心;浙江大学软弱土与环境土工教育部重点实验室;
【分类号】：TU473.1
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1 王洪生,高秀华;Timoshenko梁的对偶积分变换解法[J];山东建筑工程学院学报;1996年04期
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