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A platform for research: civil engineering, architecture and urbanism
Static Load-Deflection Studies of Prestressed Hawaiian Aggregate Concrete Beams
Using three types of concrete mixes (two lightweights and one normal weight), 18 underreinforced prestressed concrete beams were tested to investigate the load-deflection behavior of Hawaiian aggregate concrete beams subjected to single and repeated load cycles. Test results indicate that for working stresses, the differences in deflections are due to the modulus of elasticity of the three concrete mixes. The modulus of elasticity of the three concrete mixes were generally found to be adequately approximated by the cylinder secant modulus (0.4f' sub c) or the ACI recommended equation. For post cracking behavior it was found that although the normal weight concrete beams generally had larger moduli of elasticity, ultimate moments and ultimate deflections than the lightweight concrete beams, it was felt that there were no significant differences in the post cracking behavior of the lightweight or normal weight concrete beams. Available methods of predicting the load-deflection relationship of prestressed concrete beams were reported and compared with the measured data. The moment versus curvature analysis for single and repeated cyclic loadings showed that the degree of fit of the theoretical and experimental curves were dependent of the assumptions of the stress-strain curves of the concrete and the steel.
Static Load-Deflection Studies of Prestressed Hawaiian Aggregate Concrete Beams
Using three types of concrete mixes (two lightweights and one normal weight), 18 underreinforced prestressed concrete beams were tested to investigate the load-deflection behavior of Hawaiian aggregate concrete beams subjected to single and repeated load cycles. Test results indicate that for working stresses, the differences in deflections are due to the modulus of elasticity of the three concrete mixes. The modulus of elasticity of the three concrete mixes were generally found to be adequately approximated by the cylinder secant modulus (0.4f' sub c) or the ACI recommended equation. For post cracking behavior it was found that although the normal weight concrete beams generally had larger moduli of elasticity, ultimate moments and ultimate deflections than the lightweight concrete beams, it was felt that there were no significant differences in the post cracking behavior of the lightweight or normal weight concrete beams. Available methods of predicting the load-deflection relationship of prestressed concrete beams were reported and compared with the measured data. The moment versus curvature analysis for single and repeated cyclic loadings showed that the degree of fit of the theoretical and experimental curves were dependent of the assumptions of the stress-strain curves of the concrete and the steel.
Static Load-Deflection Studies of Prestressed Hawaiian Aggregate Concrete Beams
S. K. L. Fong (author) / H. S. Hamada (author)
1976
146 pages
Report
No indication
English
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