臺灣博碩士論文加值系統

　　近年來混凝土結構物的補修與加固之相關研究，逐漸受到重視。本研究主要探討混凝土版之表層修補材料，對於撞擊作用的抵抗能力。試驗採用四種水膠比0.28之高強度水泥砂漿作為修補材料，包含純水泥砂漿、矽灰水泥砂漿、碳纖維水泥砂漿以及鋼纖維水泥砂漿等修補材料；同時進行一系列混凝土版的落重撞擊試驗，並以試體之終裂撞擊次數作為評估抗撞擊能力的指標。結果顯示，鋼纖維水泥砂漿在修補厚度3、6與9公分時，抗撞擊能力依次為對照組純水泥砂漿的1.0、1.9與1.6倍；碳纖維水泥砂漿者分別為對照組純水泥砂漿的1.0、0.9與1.5倍；矽灰水泥砂漿者依次為對照組純水泥砂漿的1.0、1.0與1.3倍。
　　另一方面，對各組混凝土版受到撞擊作用的情形，進行動態3D顯含式有限元素模型的數值模擬分析。模擬結果顯示，各組混凝土版在修補層厚度3公分時，撞擊作用下拉應力集中區有接近黏結面的現象。而各組混凝土版在修補層厚度6、9公分時，基底層頂面所受到的最大等效應力分別減少為修補層厚度3公分者之63~71%、26~29%。在破壞模式方面，數值模擬的結果顯示，單次撞擊作用下，各組混凝土版在撞擊接觸面皆有塑性凹陷的破壞現象。而利用數值模擬的應力輪廓圖，可推測受到撞擊作用的混凝土版會有四種可能的破壞方式，分別為壓力破壞、剪力破壞、拉力破壞以及黏結面破壞等。最後利用模擬的結果與理論之假設與推導，建立終裂撞擊次數的預測模型。

　　In recent years, related researches on the repairing materials for concrete structures have been emphasized gradually. This study is mainly explored the resistance capability of repairing materials to the impact effect on the surface layer of concrete slab. The experiment has adopted 4 types of high strength cement mortar with 0.28 water-cementitious ratio as the repairing material, which included the pure mortar, silica-fume mortar, carbon-fiber mortar and steel-fiber mortar; in the meantime, conducted a series of drop-weight impact experiment on the concrete repairing slab, and then regarded the impact frequency of final-breaking for the test specimen as the indicator to evaluate the capability of impact resistance. The test has result showed that when the repaired thicknesses of steel-fiber mortar at 3, 6 and 9 centimeters, its impact resistances were respectively 1.0, 1.9 and 1.6 times greater than the pure mortar (control group); moreover, 1.0, 0.9 and 1.5 times for the carbon-fiber mortar; and 1.0, 1.0 and 1.3 times for the silica-fume mortar.
　　On the other hand, this study has applied the Dynamic 3D Explicit Finite Element Model to conduct the numerical simulation analysis on the impacted situation for each group’s repairing slab. The result of simulation has displayed that the tensile stress concentration area has tended to the bonding surface under impacting for each group’s repairing slab with a 3-centimeter repairing thickness. Moreover, when repairing thicknesses for each group’s concrete are 6 and 9 centimeters, the maximum equivalent stress that received on the top side of its base will then be reduced 63~71% and 26~29% respectively of the values for the 3-centimeter thickness of repairing layer. As for the failure model, the result of numerical simulation has showed that under the effect of single impacting, each group’s concrete has the failure phenomenon of plastic dent on the contact-surface of impact. In addition, the stress outline that obtained from using the numerical simulation can infer 4 possible methods of failure for the impacted concrete repairing slab, and they are compression failure, shear failure, tension failure and bonding surface failure. At last, this study has made use of the simulation result and deduction of theory to construct the prediction model for the impact frequency of final-breaking.

誌謝 Ⅰ
中文摘要 Ⅱ
Abstract Ⅲ
目錄 Ⅳ
表目錄 Ⅶ
圖目錄 Ⅷ
照片目錄 X
符號說明 XⅠ
第一章 緒論 1
1-1 研究背景 1
1-2 研究目的 2
第二章 文獻回顧 3
2-1 混凝土結構物修補 3
2-1-1 混凝土結構物修補規定與原則 3
2-1-2 混凝土結構物修補材料 3
2-1-3 修補之黏結面的處理 4
2-2 撞擊作用 6
2-2-1 撞擊過程的應力行為 6
2-2-2 混凝土材料抗撞擊性 7
2-3 高性能混凝土 13
2-3-1 鋼纖維混凝土 14
2-3-2 碳纖維混凝土 15
2-4 數值模擬撞擊作用 17
2-4-1 ANSYS/DYNA軟體 17
2-4-2 混凝土彈性模數公式 18
第三章 試驗計畫與方法 23
3-1 試驗變數規劃 23
3-2 試驗材料 24
3-3 配比設計與試體製作 25
3-3-1 配比設計 25
3-3-2 試體製作 25
3-4 試驗設備與方法 27
第四章 試驗結果分析討論 37
4-1 材料基本力學性質 37
4-1-1 修補材料之抗壓強度 37
4-1-2 修補材料之抗拉強度 38
4-1-3 修補材料之抗彎強度 39
4-2 撞擊試驗結果與討論 40
4-2-1 不同修補厚度之抗撞擊能力 40
4-2-2 不同修補材料之抗撞擊能力 42
4-2-3 混凝土版撞擊破壞模式 43
第五章 數值模擬分析與結果討論 73
5-1 模擬撞擊行為的數值模型設定 73
5-1-1 參數決定與假設 73
5-1-2 有限元素法數值模型 74
5-2 模擬撞擊行為的數值分析結果與討論 79
5-2-1 從模擬的結果討論撞擊作用可能的破壞模式 79
5-2-2 從模擬的結果討論修補層厚度的影響 82
5-2-3 從模擬的結果討論材料差異的影響 87
5-3 數值模擬結果與試驗結果比較 89
5-3-1 試驗與數值模擬的撞擊破壞模式比較 89
5-3-2 試驗與數值模擬的撞擊終裂次數比較 90
第六章 結論與建議 121
6-1 結論 121
6-2 建議 123
參考文獻 125
附錄A 131

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