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  • 學位論文

利用動態敲擊對材料不同瑕疵程度判別之研究

Study of Construction Material Quality Inspection Using Dynamic Plunking Test

指導教授 : 張子修
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摘要


本研究利用動態敲擊試驗的方式探討結構元件在簡支梁模式下,由試驗求得不同瑕疵程度構件材料之自然頻率 、勁度k值與彈性模數E,並比較於試體有無瑕疵行為時,其材料力學參數k及E之差異。 本試驗結果顯示營建材料力學參數E折減關係會隨著試體瑕疵程度而改變;其中高強度混凝土隨裂縫瑕疵程度惡化,E值下降比例為100%~37.9%,標準混凝土裂縫瑕疵下降比例為100%~27.7%,再生混凝土裂縫瑕疵下降比例為100%~31.2%。此外,高強度混凝土孔洞瑕疵下降比例為100%~17.2%,標準混凝土孔洞瑕疵下降比例為100%~27.7%,再生混凝土孔洞瑕疵下降比例為100%~12.5%。實驗結果可看出孔洞瑕疵E、fn下降的比例比裂縫瑕疵下降比例更明顯。 本研究使用之動態彈性敲擊實驗對材料力學參數E之影響相當明確,應可發展成為結構材料品質驗證之非破壞性檢測技術之一,以供日後工程實務應用。

並列摘要


The study was conducted to investigate the effects of material defect and/or deterioration on the change of mechanical properties for the selected construction material of the specimens used for the dynamic plunking test .The major parameters studied include natural frequency fn and stiffness k of the structural components from which the results of the dynamic plunking test and the eventual Young’s modulus E were examined to evaluate the integrity of the materials. The results of test showed that mechanical properties E decreases due to defect of the specimens:(1)for the cracks defects of deterioration ,E value decreased to as low as 37.9%,27.7% and 31.2% ; while (2)for the void defect of deterioration ,the value of E decreased to as low as 17.2%,27.7% and 12.5%,for the high strength ,standard ,and recycled concrete, respectively. In general, the test results clearly indicated that the dynamic plunking tests used in the study can be of a feasible and useful tool as non-destructive technique in construction material quality verification. However, further studies are required before any future application in practice can be anticipated.

參考文獻


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