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研究生:謝熒倫
研究生(外文):Ying-Lun Hsieh
論文名稱:自充填混凝土梁在高強度箍筋使用下之剪力強度測試與探討
論文名稱(外文):Investigation of Shear Strength and Behavior of SCC Beams With High Strength Stirrups
指導教授:趙文成趙文成引用關係
指導教授(外文):Wen-Chen Jau
學位類別:碩士
校院名稱:國立交通大學
系所名稱:土木工程系
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:2002
畢業學年度:90
語文別:中文
論文頁數:111
中文關鍵詞:自充填混凝土高拉力箍筋剪力韌性
外文關鍵詞:self compacting concreteSCCbeamhigh tensile steelshear strengthductility
相關次數:
  • 被引用被引用:14
  • 點閱點閱:228
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  • 下載下載:44
  • 收藏至我的研究室書目清單書目收藏:1
本研究主要在探討使用高拉力剪力筋之自充填混凝土及傳統混凝土梁受靜態載重作用下之剪力行為。試體共製作19支梁試體,其中15支為自充填混凝土梁,另4支為傳統混凝土梁。探討之變數包括混凝土的種類、混凝土強度、剪力箍筋量、剪跨比等,期望對自充填混凝土及傳統混凝土梁使用高拉力剪力筋後之剪力強度與延展性有所了解。試驗結果可歸納如下:
1、自充填混凝土及一般普通混凝土RC梁進行剪力試驗,發現兩系列梁的 裂縫發展與破壞過程相當近似。
2、自充填混凝土傾斜破裂剪力Vcr和極限剪力強度Vu,平均值為ACI計算值的1.16及1.08倍,所以ACI分析尚可適用於自充填混凝土梁在高強度箍筋(Ulbon)使用下的分析。
3、Ulbon剪力筋強度高且延展性佳,因此在梁破壞瞬間Ulbon不會突然斷裂,使得載重能力不致於突然的降低。
4、ACI規範限制剪力鋼筋設計降伏強度不得大於60ksi之規定應可適度放寬。
5、試驗結果發現,在具有相同混凝土強度、縱向鋼筋比、剪力箍筋比、剪跨深比的自充填混凝土梁與一般傳統混凝土梁,以自充填混凝土梁之極限剪力強度較高且韌性的表現較佳。
關鍵字:自充填混凝土、高拉力箍筋、梁、剪力、韌性
The purpose of this study is to investigate the shear behavior of self compacting concrete(SCC)and ordinary property cement(OPC)beams with high tensile steel ULBON under static load﹒A total of nineteen beams specimens were made in this study﹐fifteen were SCC beams and the rest were OPC ones﹒The parameters included two kinds of concrete﹐concrete strength﹐amount of shear reinforcement and shear span-to-depth ratio﹒Wishing to comprehend shear strength and ductility after using high tensile steel ULBON as shear reinforcement in SCC and OPC beams﹒The following conclusions can be made from the test results﹒
1、The pattern of crack initiation and propagation for OPC and SCC beams are similar to each other﹒
2、Cracking loads Vcr and ultimate strength Vu for SCC beams are 1.16 and 1.08 of the values calculated by ACI﹐which demonstrated the suitability of ACI equations for high strength stirrups﹒
3、The reason that load capacity of beam does not drop significantly after peak is because of the high strength and ductility of Ulbon﹒
4、The current ACI code requires that fy≦60 ksi could be suitable increase﹒
5、At the same parameters﹐the results show the self compacting concrete beams have greater ultimate shear strength and ductility over than ordinary property cement ones﹒
Keyword:self compacting concrete、SCC、beam、high tensile steel、shear strength、ductility
摘要------------------------------------------------I
Abstract--------------------------------------------II
目錄------------------------------------------------III
表目錄----------------------------------------------VI
圖目錄--------------------------------------------- VII
照片目錄--------------------------------------------IX
符號說明--------------------------------------------X
第一章緒論----------------------------------------- 1
1-1 前言-------------------------------------------1
1-2 研究動機---------------------------------------2
1-3 研究目的與方法---------------------------------3
第二章 文獻回顧-------------------------------------5
2-1 自充填混凝土之力學性質-------------------------5
2-1-1 新拌SCC強度預測-------------------------------5
2-1-2 彈性模數--------------------------------------7
2-1-3 應力-應變行為---------------------------------9
2-1-4 握裹應力------------------------------------- 10
2-2 高強度剪力筋(High Tensile Steel ULBON)-------13
2-2-1 適用範圍--------------------------------------13
2-2-2 材料------------------------------------------13
2-3 梁剪力開裂後的剪力傳遞機制---------------------14
2-4 剪力筋對剪力的貢獻-----------------------------15
2-4-1剪力筋的強度 ----------------------------------16
2-4-2剪力鋼筋量的上下限 ----------------------------17
2-4-3剪力鋼筋的間距---------------------------------18
2-5 剪力強度的影響因素-----------------------------18
2-6 剪力強度之預測公式-----------------------------20
2-6-1無剪力筋R.C梁剪力開裂強度之預測式--------------20
2-6-2有剪力筋R.C.梁剪力開裂強度之預測式-------------21
2-6-3無剪力筋R.C.梁極限剪力強度之預測式-------------22
2-6-4有剪力筋R.C.梁極限剪力強度之預測式-------------23
2-7 剪力韌性-------------------------------------- 24
2-8 桁架模式---------------------------------------25
第三章 試驗計畫及過程-------------------------------26
3-1 試體規劃---------------------------------------26
3-2 試驗材料---------------------------------------28
3-3 試體製作---------------------------------------30
3-4 實驗裝置---------------------------------------31
第四章 試驗結果與分析 ------------------------------32
4-1 新拌混凝土材料性質-----------------------------32
4-2 剪力行為---------------------------------------32
4-2-1 RC梁的開裂行為--------------------------------32
4-2-2 剪力破壞模式--------------------------------- 34
4-3 混凝土的剪力強度------------------------------ 36
4-3-1 傾斜破裂(Inclined cracking)剪力的預測-------36
4-3-2 加載過程中混凝土對剪力之貢獻 -----------------38
4-4 桁架模式(truss-model)之應用----------------- 39
4-4-1 桁架模式------------------------------------- 40
4-4-2 以桁架模式求解有效係數Ko -------------------- 42
4-4-3 極限剪力強度--------------------------------- 43
4-5 梁跨中央荷重-變位之行為探討--------------------44
4-6 梁剪力韌性-------------------------------------47
4-6-1 混凝土強度對韌性的影響------------------------48
4-6-2 剪跨深比a/d對韌性的影響-----------------------48
4-6-3 剪力鋼筋比γw對剪力韌性的影響------------------48
4-6-4 剪力筋能量吸收比------------------------------48
4-6-5 傳統混凝土與SCC梁韌性的比較-------------------49
第五章 結論 ----------------------------------------50
參考文獻 -------------------------------------------53
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