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.

• Supplemental Notes:
  • Sponsored in part by Hawaii State Div. of Highways, Honolulu. See also PB-259 967.
• Corporate Authors:

  University of Hawaii, Manoa

  Highway Division
  Honolulu, HI  United States  96822

  Federal Highway Administration

  1200 New Jersey Avenue, SE
  Washington, DC  United States  20590

  Hawaii Department of Transportation

  869 Punchbowl Street
  Honolulu, HI  United States  96813-5097
• Authors:
  • Fong, SKL
  • Hamada, H S
• Publication Date: 1976-6

Media Info

• Pagination: 146 p.

Subject/Index Terms

• TRT Terms: Aggregates; Beams; Concrete construction; Deflection; Deflection tests; Deformation curve; Dynamic loads; Forecasting; Fracture mechanics; Loads; Modulus of elasticity; Prestressed concrete; Prestressing; Static loads
• Uncontrolled Terms: Dynamic response
• Geographic Terms: Hawaii
• Old TRIS Terms: Beams (Support)
• Subject Areas: Bridges and other structures; Geotechnology; Highways;

Filing Info

• Accession Number: 00146505
• Record Type: Publication
• Source Agency: National Technical Information Service
• Report/Paper Numbers: CE76-R1 Final Rpt., FHWA/RD-76-S0548
• Files: TRIS, USDOT, STATEDOT
• Created Date: Feb 16 1977 12:00AM