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研究生:詹千儀
研究生(外文):Chian-Yi Jan
論文名稱:以敲擊回音法評估火害後鋼筋握裹狀況
論文名稱(外文):Assessment of the Fire Damage to the Bond Strength of Concrete Structures Using the Impact-Echo Method
指導教授:鄭家齊鄭家齊引用關係
指導教授(外文):Chia-Chi Cheng
學位類別:碩士
校院名稱:朝陽科技大學
系所名稱:營建工程系碩士班
學門:工程學門
學類:土木工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:96
中文關鍵詞:火害鋼筋握裹應力鋼筋轉換振幅敲擊回音法
外文關鍵詞:Bond StrengthImpact-Echo MethodConcrete StructuresFire Damage
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本研究的目的在研發可實際應用於火場鋼筋握裹力評估之非破壞檢測方法,以提供評估火害後剩餘承載力及決定修補方針之參考。本研究採用拉拔試驗試體以討論高溫延燒後鋼筋局部握裹力的損失與非破壞檢測參數間的關係。試體火害溫度控制為300、400、500、600及800℃,試體鋼筋保護層厚度在3、4、6及8cm。敲擊回音檢測方面,試驗結果包括火害後敲擊回音轉換函數中鋼筋平均振幅、鋼筋握裹強度、混凝土波速及鑽心抗壓強度之變化、拉拔試驗時敲擊回音頻譜轉換函數鋼筋平均振幅與鋼筋滑移量之關係。分析結果可知在保護層較小的3cm及4cm試體握裹強度趨勢與混凝土強度趨勢較為類似,鋼筋振幅亦即黏結程度也就是鋼筋振幅的影響不顯著;而對於保護層較大的6cm及8cm試體,在300℃及400℃時握裹強度較常溫還大20%及10%,鋼筋振幅在300℃火害溫度下振幅較公式值大30%,可推論握裹狀況比正常還要緊密。拉拔試驗時敲擊回音頻譜轉換函數鋼筋平均振幅與鋼筋滑移量之關係方面,保護層3和4cm試體之頻譜轉換函數反應結果,當鋼筋位移量為0.5mm時,各個溫度之鋼筋轉換振幅值變大,推測可能是由於剛開始進行拉拔試驗時造成鋼筋握裹介面更緊密之故。當鋼筋滑移量超過最大握裹應力之滑移量時,鋼筋轉換振幅不穩定,因為裂縫太多易造成誤判。
The study is aimed to evaluating the bond strength of reinforcement surrounded by fire damaged concrete using non-destructive method. The impact-echo method is applied for the task. The relationships between the local bond strength obtained by pull-out test and the parameters of non-destructive evaluation are discussed. The oven temperatures were controlled as 300,400,500,600 and 800℃. The specimens different steel cover thinkness are 30,40,60 and 80mm. For the impact-echo method, the distribution of the average steel-amplitude identified by the simulated transfer function of impact-echo response, the pull-out strength, the coring compressive strength, as well as the P-wave speed of concrete with respect to the temperature of the oven were discussed. It was found for smaller cover thickness, 30 mm and 40 mm, the bond strength is more closely related to the concrete compressive strength. The affection of reducing steel-amplitude, which means poor interfacial bonding, is limited. For larger cover thickness, 60 mm and 80 mm, the bond strengths are 20% and 10% higher than the one in room temperature when they placed in oven with constant temperature 300 and 400℃, respectively. It was found the steel-amplitude is also 30% higher than predicted for 300℃ specimens with both cover thicknesses, which implies a closer bonding at steel-concrete interfaces. When the bond slip displacement of reinforcing bar is about 0.5mm, the steel-amplitude becomes large for the specimens with cover thickness 30 and 40mm. The behavior may be caused by the reinforcing bar closery contact with the surrounding concrete at early stage of pull-out test. The variation of steel-amplitude becomes very large for the cases with bond slip over the one corresponding to the maximum bonding stress. It may due to large amount of cracks developed around the rebar.
目錄
摘要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VIII
圖目錄 IX
第一章 緒論 1
1-1 前言 1
1-2 研究動機與目的 1
第二章 文獻回顧 3
2-1 前言 3
2-2 高溫對混凝土抗壓強度之影響 3
2-3 高溫對鋼筋握裹強度之影響 5
2-4 鋼筋混凝土之握裹行為 7
2-4-1 握裹力基本原理 7
2-4-2 握裹力破壞模式及影響因素 8
2-5 鋼筋尺寸及配置對於敲擊回音反應的影響 10
2-5-1 鋼筋頻率與敲擊回音之關係 10
2-5-2 鋼筋轉換振幅與D/c之關係 12
2-5-3 鋼筋振幅與鋼筋握裹損失之關係 13
第三章 檢測原理及儀器設備介紹 15
3-1 應力波動行為 15
3-1-1 敲擊回音法之原理(頻譜領域分析法) 18
3-1-2 敲擊回音法之混凝土波速量測(時間領域分析法) 20
3-2 近似轉換振幅函數推導 20
3-2-1 轉換函數原理 20
3-2-2 近似轉換振幅函數推導 21
3-3 儀器設備介紹 25
第四章 實驗規劃 28
4-1 單根鋼筋握裹實驗規劃 28
4-1-1 試驗規劃 28
4-1-2 高溫延燒試驗 29
4-2 單根鋼筋握裹之敲擊回音試驗規劃 31
4-3 單根鋼筋高溫延燒後進行拉拔試驗 32
4-3-1 拉拔試驗規劃 32
4-3-2 拉拔試驗時鋼筋握裹之檢測 33
4-4 鑽心驗證 33
第五章 試驗結果分析與討論 34
5-1 高溫下試體溫度結果 34
5-2 高溫延燒前鋼筋握裹訊號試驗結果 35
5-2-1 敲擊回音試驗—頻譜轉換函數反應結果 35
5-2-2 鋼筋轉換函數受Cp影響 37
5-3 高溫延燒後鋼筋握裹訊號試驗結果 37
5-3-1 混凝土波速與火害溫度之結果 37
5-3-2 敲擊回音試驗—頻譜轉換函數反應結果 38
5-4 高溫延燒後單根鋼筋拉拔試驗 40
5-4-1 火害溫度下鋼筋握裹力之探討 40
5-4-2 不同火害溫度下鋼筋局部握裹力與滑移量之探討 40
5-4-3 拉拔試驗時敲擊回音試驗-頻譜轉換函數反應結果 41
5-5 鑽心驗證混凝土強度 42
5-6 影響鋼筋握裹強度之非破壞檢測參數 43
第六章 結論與建議 44
6-1 結論 44
6-1-1 高溫延燒前鋼筋握裹訊號試驗結果 44
6-1-2 高溫延燒後鋼筋握裹訊號試驗結果 44
6-1-3 高溫延燒後單根鋼筋拉拔試驗結果 45
6-1-4 鑽心驗證混凝土強度試驗結果 45
6-2 討論與建議 46
參考文獻 47
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