Concrete Beams with Prestressed Elements

by Manak B. Mawal, Reader; Dept. of Struct. Engrg., Malaviya Regional Engr. Coll., Jaipur, Rajasthan, India,

Serial Information: Journal of the Structural Division, 1979, Vol. 105, Issue 3, Pg. 617-633

Document Type: Journal Paper

Abstract: The tests on 16 simply supported rectangular concrete beams reinforced with precast elements were undertaken to provide information on general charactertistics such as cracking and ultimate strength, flexural rigidity, effect of roughness of surface of elements, effective residual prestress, change in behavior of these beams when reinforced with combination of mild steel, and effectiveness of prestressing wire and the element to failure. The collapse loads calculated on the basis of the simple plastic theory gave safe and conservative values for the ultimate load capacities of the composite beams. Test data of seven symmetrically loaded two-span continuous rectangular concrete beams confirmed the ability of support hinges to redistribute the moments. A method for computing the magnitude of plastic rotation at the hinge sections along with moment-curvature relationship is proposed.

Subject Headings: Concrete beams | Composite beams | Failure loads | Load bearing capacity | Reinforced concrete | Prestressing | Ultimate loads | Flexural strength |

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