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碩士論文公告區 |
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| 年度： | 95 | |
| 姓名： | 張智傑(Chih-Chieh Chang) | |
| 論文題目(中)： | 以敲擊回音法檢測混凝土構件於火害後的劣化程度 | |
| 論文題目(英)： | Using Impact-Echo method to Investigate the Concrete after High-Temperature Exposure | |
| 摘要(中)： | ||
| 混凝土結構物於火害後由於內部所產生的化學變化，使得混凝土受熱面會產生劣化的現象，本研究的目的是希望能藉由非破壞的方法，利用應力波傳遞的方式檢測火害後的劣化程度。於混凝土表面以鋼珠做敲擊源敲擊，將接收器設置於20cm之距離，以所得到之頻譜中的主要反應頻率，來評估混凝土的劣化程度。 本研究之試體分為兩種，一為大小40*40*15cm之小型混凝土試體，受到火害溫度為300、400、500、600、800℃；另一為大小為240×130×15cm之大型混凝土板，火害溫度為600℃。先以小型混凝土試體利用應力波法作表面頻率量測後再鑽心，劣化深度是由鑽心試體切片之動態彈性模數的差異性判定，以所得之表面頻率與劣化深度做分析，將所得結果驗證至大型混凝土板上探討其是否相關。 由研究結果顯示，於混凝土試體表面以應力波法量測所得到之尖峰振幅頻率最低值若為13~14kHz時，其劣化深度約為2cm；若尖峰的頻率值為11~12 kHz時，其劣化深度約為6~8cm；若尖峰頻率在9~10 kHz時，則劣化深度則約為10cm；若尖峰頻率在7~8kHz時，則劣化深度則約為12~13cm。 |
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| 摘要(英)： | ||
| The interior chemical reactions produced by fire leads to surface deterioration of structural concrete. The aim of the present research is to evaluate the degree of deterioration non-destructively by means of stress waves. In the study, a steel ball is used as the impactor and the frequency of the principal response obtained by a receiver 20 cm away is used for concrete evaluation. Two types of specimens were investigated. One is the small specimens with dimensions 40*40*15 cm. These specimens were heated by oven with the temperatures 300, 400, 500, 600, and 800℃. The other is large concrete plate with the size 240*130*15 cm. The specimen is heat by fire with environmental temperature 600℃. The frequencies of the principle responses of the small specimens were compared to the depth of concrete deterioration obtained from drilled core. The cores were sliced into disks and the depth of the deterioration was evaluated by the variation of the dynamic elastic modulus of the disks. The relationship between the lowest primary frequency and the depth of deterioration obtained from the small specimens were used for evaluate the depth of deterioration of the big plate after fire. The test results show the depths of deterioration are about 2 cm, 6-8 cm, 10cm, and 12-13 cm while the lowest primary frequencies are 13-14 kHz, 11-12 kHz, 9-10 kHz, and 7-8 kHz, respectively. |
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| 檔案： | 沒有相關檔案 | |
| 相關連結： | http://ethesys.lib.cyut.edu.tw/ETD-db/ETD-search-c/view_etd?URN=etd-0830107-162219 | |