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標題: 高工作度混凝土預力梁之撓曲行為
Flexural Behavior of Prestressed Beams with High-Workability Concrete
作者: 范博翔
Fan, Po-Hsiang
關鍵字: HWC;高工作度混凝土;prestressed beam;loss of prestress;flexural behavior;預力梁;預力損失;撓曲行為
出版社: 土木工程學系所
引用: 1.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. 2.Burns, N. H., “Moment Curvature Relationships for Partially Prestressed Concrete Beams,” PCI Journal, Vol.9, NO.1, Feb. 1964, pp. 52-63. 3.Naaman, A. E.; Harajli, M. H.; and Wight, J. K. “Analysis of Ductility in Partially Prestressed Concrete Flexuarl Members,” PCI Journal, Vol.31, NO.3, May-Jun. 1986, pp. 64-189. 4.李嘉榮, “含鋼線網剪力筋預力梁之撓曲行為”, 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. 5.吳秉駿, “台灣地區使用飛灰爐石混凝土變形之預測研究”, 碩士論文,國立台灣大學土木工程研究所, 民國八十九年六月. 6.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. 7.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. 8.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. 9.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. 10.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. 11.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. 12.ACI Committee 309, “Guide for Consolidation of Concrete (ACI 309R-96),” American Concrete Institute, Farmington Hills, Michigan, 1996. 13.Lin, T. Y. and Burns, N. H. “Design of Prestressed Concrete Structures,” Third Edition, John Wiley & Sons. 14.日本土木學會, “高性能混凝土施工指南,” 民國87年7月.

2. 高工作度混凝土預力梁與普通混凝土預力梁在預力損失方面比較,使用高工作度混凝土比使用普通混凝土的預力梁放置在同樣的環境之下,高工作度混凝土比普通混凝土的預力損失少。
3. 相同條件下,提高混凝土強度、減小預力量、加大剪跨比及縮小箍筋間距皆對梁之延展性有正面的貢獻,而高工作度混凝土預力梁之延展性更優於普通混凝土預力梁。
4. 相同條件下,提高混凝土強度、增加預力量、減小剪跨比及縮小箍筋間距皆對梁之裂縫控制有正面的貢獻,而高工作度混凝土預力梁之裂縫控制更優於普通混凝土預力梁。

The purpose of this study is to investigate the flexural behavior of prestressed beams with high-workability concrete (HWC) under static load. A total of 18 prestressed beam specimens were made in this study: nine were prestressed normal concrete beams and the rest were prestressed HWC beams. The specimens had T-section, flange width was 400 mm (15.75 in), beam depth was 400 mm (15.75 in), flange thickness was 80 mm (3.15 in), and web width was 200 mm (7.87 in). The span length of the beams was 4200 mm (165.35 in). The parameters included concrete strength, amount of prestress, shear span to depth ratio, and spacing of transverse reinforcement. The following conclusions can be made from the results:

1. Prestressed HWC beams and prestressed NC beams have similar flexural strengths. The ACI simplified design method using an equivalent rectangular stress block can be used for the flexural strength design of prestressed HWC beams ;
2. Compare with NC prestressed beam, HWC prestressed beam have less prestress loss under the same condition.
3. Prestressed HWC beams exhibit better ductility than prestressed NC beams. An increase of concrete strength, decrease of prestress strength, increase of shear span to depth ratio, and decrease of spacing of transverse reinforcement would improve the ductility significantly;
4. The crack control ability of HWC prestressed beams is better than prestressed NC beams due to its better concrete quality.
其他識別: U0005-2508200610302400
Appears in Collections:土木工程學系所

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