鋼筋混凝土梁受扭力學行為與保護層剝離-裂縫關係之研究

• Main Author: 戴里煒
• Other Authors: 陳文雄
• Format: Others
• Language: zh-TW
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/99458643880680367632

碩士 === 國立中央大學 === 土木工程研究所 === 87 === Influent of the Concrete Cover Spelling and Cracking on Torsion Behavior of Reinforced Concrete Beam ABSTRACT This paper describes tests on the spelling behavior of reinforced concrete beam including normal and high strength concrete .The major variables are the thickness of concrete cover, longitudinal steel, and stirrup spacing. All 28 rectangular beams were tested. The spelling area is noted by using the characteristics that Phenolphthalein liquid turns red in alkalinity due to concrete itself. The test results revealed that the spelling of reinforced concrete beam would affect the torsion strength. The thickness of concrete cover definitely affected the spelling behavior of beams. The spelling of concrete cover would change the model applied to the torsion beams. The beams with less concrete cover are suited to be predicted by softening space truss model. In contrast, to some extent, Diagonal Compression Field will predict torsion strength of beams with thicker concrete cover. In 1995 ACI code, the design of reinforced concrete beams for torsion is based on space truss model. The thickness of concrete cover is not considered in the code. It is suggested that limit on concrete cover to distinguish the model used should be included.