Title: Dynamic Properties of Reinforced and Prestressed Concrete Structural Components
Author(s): M. L. James, G. M. Smith and L. D. Lutes
Publication: Journal Proceedings
Appears on pages(s): 1359-1382
Sixteen concrete beams were subjected to sinusoidal exciting forces of varying magnitudes for the purpose of evaluating the flexural rigidity and internal damping properties. Experimental data were obtained for both reinforced and prestressed beams fabricated with Haydite aggregate and a siliceous aggregate. The percent of reinforcement was varied for the reinforced concrete beams. The studies indicated that: (a) Modulus of elasticity of the prestressed concrete made with siliceous aggregate was 20 to 30 percent higher than that of companion reinforced concrete beams. (b) Damping in reinforced and prestressed concrete beams was not viscous for small amplitudes of vibration. (c) Prestressed beams, with siliceous aggregate, showed much greater resistance to cracking than regular reinforced beams. (d) The effect of uniaxiol prestress on a concrete plate indicates that the modulus of elasticity in the direction of prestress in the plate was raised approximately 26 percent.