小波包和功率谱密度分析法在混凝土龄期强度监测中的应用
发布时间：2018-08-03 11:58
【摘要】：利用压电智能骨料激发的应力波,对混凝土28 d内目标龄期进行信号监测试验研究,并通过功率谱密度和小波包能量分析法对混凝土龄期内监测信号进行分析。试验结果表明:混凝土目标龄期内,随着时间的逐渐增加,混凝土试件中传感器监测信号的小波包能量和功率谱密度的幅值随时间的变化趋势呈现出非线性增长,6 d和12 d是增长变化的分界点,其幅值分别达到了2.345×104V2、3.923×104V2和61.54 pV~2/Hz,98.86 pV~2/Hz。其试验结果与混凝土试件在实际养护过程中试件强度的变化规律具有很好的一致性。
[Abstract]:Using the stress wave excited by piezoelectric intelligent aggregate, the signal monitoring test is carried out on the target age of concrete within 28 days, and the monitoring signal of concrete age is analyzed by power spectrum density and wavelet packet energy analysis method. The test results show that the concrete target age increases gradually with time. The amplitude of wavelet packet energy and power spectral density of the sensor monitoring signal in concrete samples showed a trend of nonlinear growth of 6 d and 12 d, respectively, and the amplitude reached 2.345 脳 10 4 V 2 + 3.923 脳 104V2 and 61.54 pV ~ (2 /) H ~ (2 / H) / V ~ (2) / H _ (2) H _ (z), respectively. The experimental results are in good agreement with the strength variation of concrete specimens in the actual curing process.
【作者单位】： 中国地震局地震研究所地震与大地测量重点实验室;
【分类号】：TU528
本文编号：2161675
[Abstract]:Using the stress wave excited by piezoelectric intelligent aggregate, the signal monitoring test is carried out on the target age of concrete within 28 days, and the monitoring signal of concrete age is analyzed by power spectrum density and wavelet packet energy analysis method. The test results show that the concrete target age increases gradually with time. The amplitude of wavelet packet energy and power spectral density of the sensor monitoring signal in concrete samples showed a trend of nonlinear growth of 6 d and 12 d, respectively, and the amplitude reached 2.345 脳 10 4 V 2 + 3.923 脳 104V2 and 61.54 pV ~ (2 /) H ~ (2 / H) / V ~ (2) / H _ (2) H _ (z), respectively. The experimental results are in good agreement with the strength variation of concrete specimens in the actual curing process.
【作者单位】： 中国地震局地震研究所地震与大地测量重点实验室;
【分类号】：TU528
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1 刘刚;基于电阻率法的混凝土龄期等效研究[D];三峡大学;2016年
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