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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Prestressed Concrete Composite Beams
Under Repeated Loading
Author(s): H. W. Chung and T. Y. Chung
Publication: Journal Proceedings
Appears on pages(s): 291-295
Keywords: beams (supports); bond (concrete to concrete);deflection: failure: fatigue (materials);flanges: joints (junctions); loads (forces);shear connectors: sheer stress: slippage:T-beam; webs (supports).
Abstract:An experimental investigation was undertaken to study the effects of repeated loading on the horizontal shear connection between the precast concrete web and the cast-in-place concrete flange of a composite beam. The test program included 18 prestressed concrete composite t-beams, the variables being the amount of joint reinforcement and the intensity of the repeated load. The test results indicate that the fatigue strength of the rough bonded interface is not less than 55 percent of the static strength and, under repeated loading, the critical slip is around 0.025 mm (0.001 in.), beyond which the efficancy of the joint rapidly deteriorates. To improve the endurance of the joint, a minimum of 0.3 percent of the joint reinforcement is tentatively recommended. It is shown that any previous repeated load not high enough to cause fatigue failure has no detrimental effect on the horizontal shear esistance of the joint.
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