【摘要】：通過積分變換法,對考慮樁身材料阻尼條件下的樁基縱向振動問題進(jìn)行求解,并得到了樁 土系統(tǒng)的傳遞函數(shù)以及脈沖響應(yīng)函數(shù)。通過脈沖響應(yīng)函數(shù)與外部激振函數(shù)在時域內(nèi)卷積,可以得到任意激振條件下,樁頂位移(速度)響應(yīng)的時域解析解,解決了分離變量法由于解法局限性只能對穩(wěn)態(tài)正弦激振響應(yīng)進(jìn)行求解的不足,大大提升了解的適應(yīng)性。并對工程測試中可能出現(xiàn)的測試信號高頻干擾問題進(jìn)行了波形分析,由于樁阻尼的存在,測試信號中的高頻干擾成分所對應(yīng)的響應(yīng)會自動濾去,同時低頻成分對應(yīng)后繼反射波趨于"寬扁"型。當(dāng)樁阻尼較大時,反射波的起跳位置發(fā)生改變,不能作為一維彈性波速的測試依據(jù)。
[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.
【作者單位】： 浙江大學(xué)濱海和城市巖土工程研究中心;浙江大學(xué)軟弱土與環(huán)境土工教育部重點實驗室;
【分類號】：TU473.1

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1 王洪生,高秀華;Timoshenko梁的對偶積分變換解法[J];山東建筑工程學(xué)院學(xué)報;1996年04期

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