International Journal of Civil & Structural Engineering
Author(s) : ABDULKADIR CUNEYT AYDIN, BARIS BAYRAK
In this study, behaviour of reinforced concrete beams under pure torsion have been investigated. Test series comprise of 12 units of reinforced concrete beams of 250x300x1500 mm. Stirrup spacing was selected 80 mm and 100 mm, concrete class was selected C20 and C40. The test specimens divided into 4 groups. In the test specimens, 16 mm was used for the longitudinal reinforcement, 8 mm was used for the stirrup and convensional concrete was used. The torsioal moment capacity, rotation angles of the concrete beams was investigated. In addition to this, the releationship between the torsional moment and rotation angles, the failure torsional moment, the cracks occuring at the beams were examined. For the theorically formula of torsional moment capacity, American Concrete Institute (ACI), Eurocode-2, Turkish Standart, elastic, plastic and skew-bending theories were used. Experimental results and theoretical results of the torsional moment capacity and the failure torsional moment were compared. The best result of torsional moment capacity was obtained at the Turkish Standard. In addition to this, the closest values with tosional moment capacity was obtained at the skew-bending theory. The high concrete class and short stirrup spacing have a good influence on the the torsional moment. Moreover, high concrete class and short stirrup spacing have a favorable influence on the torsional moment-rotation angle relationship. The cracks that was occured in the beams due to pure torsion were occured shape diagonal.