Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/15502
標題: 高工作度混凝土預力梁之剪力行為
Shear Behavior of Prestressed Beams with High-Workability Concrete
作者: 林為杰
Lin, Wei-Chieh
關鍵字: high-workability concrete;高工作度混凝土;預力梁
出版社: 土木工程學系所
引用: 1.Elzanaty, A. H.;Nilson, A. H. ; and Slate, Floyd O. “ Shear Capacity of Prestressed Concrete Beams Using High-Strength Concrete ”ACI Journal ,proceedings V. 83, No. 3, May-june 1986, pp.319-368. 2.徐育邦,“高強度飛灰混凝土梁之剪力行為” 碩士論文,國立中興大學土木工程研究所,民國八十二年六月。 3.林甫人,“含鋼線網剪力筋預力梁之剪力行為” 碩士論文,國立中興大學土木工程研究所,民國八十四年六月。 4.Lin, C. H. ; and Lee, F. S. , “Ductility of High-Performance Concrete Beams with High-Strength Lateral Reinforcement” ACI Structural Journal, V. 98, No. 4, July-August 2001, pp. 600-608. 5.Li, J. ; and Yao, Y. , “A study on creep and drying shrinkage of high performance concrete, ” Cement and Concrete Rearch, 31 (2001), 1203-1206, May. 2001. 6.Lin, C. H. ; and Lee, W. C. , “ Shear Behavior of High-Workability Concrete Beams ” ACI Structural Journal, V. 100, No. 5, September -October 2003, pp. 599-608. 7.Lin, C. H. ; Lin, S. P. ; and Tseng, C. H. , “High-Workability Concrete Columns Under Concentric Compression” ACI Structural Journal, V. 101, No. 1, January-February 2004, pp. 85-93. 8.Lin, C. H. ; and Lin, S. P. , “Flexural Behavior of High-Workability Columns Under Cyclic Loading” ACI Structural Journal, V. 102, No. 3, May-June 2005, pp. 412-421. 9.林士平, “不同流動性混凝土的圍束效應” 博士論文,國立中興大學土木工程研究所,民國九十四年七月。 10.范博翔, “高工作度混凝土預力梁之撓曲行為” 博士論文,國立中興大學土木工程研究所,民國九十五年七月。 11.ACI Committee 309, “Guide for Consolidation of Concrete (ACI 309R-96)” American Concrete Institute, Farmington Hills, Michigan, 1996. 12.ACI Committee 318, “Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI 318R-05)” American Concrete Institute, Detroit, 2005, pp. 263-290. 13.ACI Committee 224, “Control of Cracking in Concrete Structures” ACI Journal, V. 69, No. 12, Dec. 1972, pp. 717-752.
摘要: 
本研究主要在探討高工作度混凝土與普通混凝土預力梁承受靜態載重作用下之剪力行為,試驗共製作二十支預力混凝土梁,其中十支為高工作度混凝土預力梁,另十支為普通混凝土預力梁。試驗之變數包含混凝土強度、預力量、剪跨比、剪力筋間距。試驗結果如下:

1.在相同變數條件下,高工作度混凝土預力梁之剪力開裂強度及剪力極限強度都優於普通混凝土預力梁,平均分別為普通混凝土預力梁之1.20及1.17倍。
2.針對本試驗而言,使用ACI撓剪開裂預測式計算剪力開裂強度有過於保守之趨勢,而ACI腹剪開裂預測式以實際預力梁有效深度進行計算較為合理。
3.ACI預測式以Vn=Vc進行無剪力筋預力梁之設計有低估混凝土貢獻之趨勢,混凝土實際可承受之極限剪力強度約為Vc之1.74倍。
4.ACI預測式以Vn=Vc+Vs設計含剪力筋梁中混凝土與剪力筋之貢獻均有低估之情形。混凝土實際可承受之極限剪力強度約為Vc之1.41倍。另外剪力筋之實際貢獻亦為ACI預測式中Vs之1.44倍左右。
5.高工作度混凝土配比中粗骨材含量較多、用水量較少以及使用波索蘭材料都可改善混凝土長期變形進而降低預力損失。
6.高工作度混凝土預力梁之裂縫控制能力較普通混凝土預力梁佳,在相同裂縫寬度時,高工作度混凝土預力梁可承受之剪力為普通混凝土預力梁之1.21倍。
7.由載重位移圖可知高工作度混凝土預力梁之勁度較普通混凝土預力梁高,顯示提升粗骨材用量,對預力梁構件勁度有正面之影響。

The purpose of this study is to investigate the shear behavior of prestressted beams with high-workability concrete and normal concrete under static load. A total of 20 prestressed beam specimens were made in this study: ten were prestressed high-workability concrete beams and the rest were normal concrete beams. The parameters included concrete strength, amount of prestress, shear span to depth ratio, and spacing of transverse reinforcement. The results show that:

1.With the same parameters, prestressed HWC beams have higher diagonal cracking strengths and ultimate strengths than prestressed NC beams. The cracking and ultimate strengths of HWC beams were 1.20 and 1.17 times those of NC beams respectively.
2.The ACI Vci equation is conservative. The ACI Vcw equation calculated by actual dp is more reasonable.
3.The ACI Vc and Vs equations underestimate the contributions of concrete and transverse reinforcement at ultimate.
4.HWC used more coarse aggregates, less water, and more pozzolanic materials, and the prestress loss can be less.
5.Prestressed HWC beams have better crack control ability than prestressed NC beams. With the same crack width, HWC beams reach higher loads which are approximately 1.21 times those of NC beams.
6.Prestressed HWC beams have higher stiffness than prestressed NC beams, due to that HWC uses more coarse aggregates than NC.
URI: http://hdl.handle.net/11455/15502
其他識別: U0005-0608200715355600
Appears in Collections:土木工程學系所

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