AN EXPERIMENTAL STUDY OF MODEL DEEP BEAMS. REPORT 1. TESTS ON ONE-QUARTER SCALE SIMPLY SUPPORTED BEAMS

The study was conducted to determine to what extent strength properties of materials used in environmental (strength) modeling of reinforced concrete deep beams need to be scaled. The first phase of this study was conducted to determine the effect that concrete strength has on shear and flexural fai...

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Bibliographic Details
Main Authors: Hampe,P. A, Balsara,J. P
Format: Report
Language:English
Subjects:
BEAMS(STRUCTURAL)
DEFLECTION
FAILURE(MECHANICS)
LOADS(FORCES)
MAGNESIUM ALLOYS
Mechanics
MODEL TESTS
REINFORCED CONCRETE
RESPONSE
SCALE
STEEL
STRAIN(MECHANICS)
STRENGTH(PHYSIOLOGY)
STRESSES
Structural Engineering and Building Technology
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Summary:The study was conducted to determine to what extent strength properties of materials used in environmental (strength) modeling of reinforced concrete deep beams need to be scaled. The first phase of this study was conducted to determine the effect that concrete strength has on shear and flexural failures of model reinforced concrete deep beams, and the second phase was conducted to determine if the tensile and compressive reinforcements in the beams can be scaled using bars of intermediate-grade steel. This was accomplished by comparing the response of two beams, one reinforced with intermediate-grade steel, and the other with an alloy of magnesium, so that the ratio of forces developed at yield in the two different reinforcements was near unity. Results of tests of ten simply supported, doubly reinforced concrete deep beams subjected to a concentrated static load are presented herein. Four beams had a clear-span-to-effective-depth ratio, i.e. L/d, of 2.00, and six beams had an L/d of 4.67. Two L/d = 4.67 beams were used to compare the response of a beam reinforced with steel with one that was reinforced with magnesium-lithium bars. Test results indicated that concrete strength has considerable effect on ultimate load and mode of failure of L/d = 2.00 beams, but has less effect on ultimate load and no effect on mode of failure of L/d = 4.67 beams. The comparison study of beams with different reinforcing materials indicated that tensile and compressive forces in reinforcements can be scaled properly using either steel or magnesium-lithium bars, although length and stress scales of the steel bars must be distorted. (Author)