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碩士論文公告區 |
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| 年度： | 95 | |
| 姓名： | 林家群(Chia-Chun Lin) | |
| 論文題目(中)： | 音射法監測混凝土修補前後之開裂行為研究 | |
| 論文題目(英)： | The study of cracking behavior of repaired concrete using acoustic emission measurement | |
| 摘要(中)： | ||
| 本文主要在研究鋼筋混凝土劈裂破壞及握裹破壞之力學行為 與Acoustic Emission 訊號變化的關係， 並與修補後的行為進行比 較。研究中製作長15cm 混凝土立方形試體， 其變數有混凝土強 度、破壞方式、修補前後比較， 試驗方式採用劈裂試驗及拉拔試 驗， 並以位移控制加載至破裂， 之後經環氧樹脂Epoxy 修補後再 加載。另外，本試驗同時使用AE 訊號監測儀，期找出破裂行為及 AE 訊號關係， 並建立相關資料庫。 本研究試驗結果發現， 劈裂和拉拔由於力學行為不同， 呈現 AE 訊號亦明顯不同； 而拉拔接觸面又因為接觸到鋼板或橡膠墊， 導致承載力大小、破壞所需的能量及裂縫開裂方式與行為， 有很 大的差異。大部分的AE 訊號都集中在靠近尖峰載重，試體修補後 訊號會更是如此。由AE 訊號分析發現劈裂破壞屬無預式破壞。另 由拉拔試驗訊號分析觀察，其AE 訊號呈現一個或兩個尖峰值，此 現象係反應其鋼筋混凝土試體之不同條件所產生破壞過程之差異。 |
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| 摘要(英)： | ||
| This research primarily focuses on studying the splitting fracture and debonding behavior of concrete correlated their corresponding Acoustic Emission signals. The concrete after repair was with also monitored and compared. Specimens of 15cm × 15cm × 15cm cube have been made with variables in strength, failure type and with/without repair. Splitting test and pull-out test were conducted with a displacement control in MTS loadfram. Specimens were loaded to broken first, then they were repaired and finally reloaded to fail. An AE monitor system was employed to figure out its signals correlated with the fracture behavior during the load test. The test results showed that the AE signals turns out a distinction between splitting fracture and debonding behaviors. A rubber pat between the pull-out specimen and load plate makes the behavior different in its failure mechanics including load capacity, fracture energy and fracture type. Most AE signal appears mainly near the peak load, in particular, for those repaired concrete. AE signals in splitting fracture also turns out a sudden failure type. It also showed that there are two peak in AE signal for those pull-out loading test, which reflect different bonding condition between concrete and rebar. |
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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-0828107-144215 | |