【摘要】：利用壓電智能骨料激發(fā)的應(yīng)力波,對(duì)混凝土28 d內(nèi)目標(biāo)齡期進(jìn)行信號(hào)監(jiān)測(cè)試驗(yàn)研究,并通過功率譜密度和小波包能量分析法對(duì)混凝土齡期內(nèi)監(jiān)測(cè)信號(hào)進(jìn)行分析。試驗(yàn)結(jié)果表明:混凝土目標(biāo)齡期內(nèi),隨著時(shí)間的逐漸增加,混凝土試件中傳感器監(jiān)測(cè)信號(hào)的小波包能量和功率譜密度的幅值隨時(shí)間的變化趨勢(shì)呈現(xiàn)出非線性增長,6 d和12 d是增長變化的分界點(diǎn),其幅值分別達(dá)到了2.345×104V2、3.923×104V2和61.54 pV~2/Hz,98.86 pV~2/Hz。其試驗(yàn)結(jié)果與混凝土試件在實(shí)際養(yǎng)護(hù)過程中試件強(qiáng)度的變化規(guī)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.
【作者單位】： 中國地震局地震研究所地震與大地測(cè)量重點(diǎn)實(shí)驗(yàn)室;
【分類號(hào)】：TU528

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1 劉剛;基于電阻率法的混凝土齡期等效研究[D];三峽大學(xué);2016年

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本文編號(hào)：2161676