STATIC TESTS OF REINFORCED CONCRETE BEAMS. REPORT 1. DEVELOPMENT OF ITERATIVE ANALYSIS PROCEDURE AND TESTS OF BEAMS REINFORCED WITH STEEL ALUMINUM, AND FIBER GLASS, WITH AND WITHOUT HELICAL COMPRESSIVE REINFORCEMENT.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MISS
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The report outlines a general iteration analysis procedure for estimating the flexural strength, the moment rotation, and the load-deflection characteristics of reinforced concrete members with arbitrary cross section and arbitrary reinforcement but symmetrical about the plane containing the applied loads. The method is based on the traditional assumptions made in elementary beam theory and on the actual stress-strain relations of the reinforcement and concrete as determined in standard tests but does not specify compressive strain for concrete. Results of tests on 11 simply supported beams of 6-ft span reinforced with single or multiple layers of high-strength steel, aluminum, and fiber-glass rods, both with and without helical confining reinforcement in the compression zone, are described and compared with analytical results. Agreement of theory and experiment was considered satisfactory in the majority of tests. It was also found that a Helical compressive reinforcement significantly increased the ductility of all beams and the load-carrying capacity of overreinforced beams. b Deformed fiber-glass rods developed good bond with concrete, enabling the fiber-glass-reinforced beams to exhibit higher ultimate moments than their high-strength steel-reinforced counterparts, despite deflections that were two or more times larger than those of the steel-reinforced beams. c The ultimate concrete compressive strain measured on the top beam surface preceding the formation of first spalls is a function of the strain gradient and varied from 0.003 to 0.007, depending on the strain gradient. Author
- Laminates and Composite Materials
- Structural Engineering and Building Technology