碩士論文公告區

年度: 94
姓名: 李洲亘(Chou-Hsuan Lee)
論文題目(中): 紅外線熱影像法參數設定與表層混凝土火害受損區域檢測
論文題目(英): Parameter determination of infrared thermography toward the inspection of concrete surfaces after fire exposure
摘要(中):
本研究使用紅外線熱影像儀檢測火害後混凝土表面缺陷。紅外線熱影像法屬於大範圍之非破壞性檢測,它能夠利用熱影像圖溫度的區別來判定缺陷的位置,以達到初步檢測之目的。
本研究結果顯示,火害後混凝土不論表面或內部缺陷皆可以用紅外線熱影像圖溫度的高低判別;當火害後之混凝土有缺陷發生時,熱影像圖溫度較高的部份即缺陷發生之位置,尤其當裂縫越密集時,熱影像圖相對位置之溫度也會越高;使用ANSYS模擬2D與3D人工裂縫之混凝土試體,其模擬結果之溫度最高處與人工裂縫之位置相吻合,即驗證熱影像圖之結果。將火害後之混凝土試體針對紅外線熱影像圖溫度較高之部分鑽心取樣,並與乾點式超音波波速相互比較,其結果可得,鑽心試體抗壓強度與超音波脈波波速呈現正相關性。火害後混凝土放射率會隨著表面顏色變化而改變,當混凝土受火害之後,表面顏色會隨著火害溫度的提高而變紅,混凝土之放射率也會隨之提高,最高提高到放射率約0.95,由此結果可以作為使用紅外線熱影像儀判斷火害後混凝土之最重要參數之依據。
摘要(英):
The objective of current study is to explore the feasibility of post-fire assessment of concrete surface using infrared thermography, or IRT. Fire exposure of concrete specimens was simulated using electric ovens at different temperatures lasting for two hours. Uniform heat flux was applied to the surface of the specimen after cooling to room temperature. The thermal images were then taken immediately following the heat flux was terminated. In some cases, surface cracks may be associated with the area of higher temperature in thermal images. Similar results were found based on two- and three-dimensional modeling using finite element analysis. Furthermore, the effect of concrete surface emissivity on the thermal images was also investigated.
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相關連結: http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0823106-143357

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