DEFLECTIONS OF REINFORCED CONCRETE BEAMS

A simple procedure for the calculation of deflections of reinforced concrete beams is presented. In this procedure, the short-term deflection is estimated assuming elastic behaviour and using Branson's formula for the effective second moment of area i(sub ef). However, it is proposed that i (sub ef) calculated by Branson's formula should be limited to 0.6i(sub g) rather than i(sub g) for beams with a(sub st)/bd less than or equal to 0.005 in order to account for the loss of bending stiffness in such cases due to the tensile stresses produced by shrinkage and temperature changes. The long-term deflections due to creep and shrinkage are calculated separately by means of simple expressions. These expressions are based on the results given by rigorous calculation methods developed previously by Warner and Gilbert. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/08190259
• Corporate Authors:

  Institution of Engineers

  11 National Circuit
  Barton, A.C.T.,   Australia 
• Authors:
  • Rangan, B V
• Publication Date: 1985-5

Media Info

• Features: Figures; References;
• Pagination: p. 216-224
• Serial:
  • Institution of Engineers (Australia) Civ Eng Trans
  • Volume: CE27
  • Issue Number: 2
  • Publisher: Institution of Engineers
  • ISSN: 0819-0259

Subject/Index Terms

• TRT Terms: Beams; Bending; Calculation; Creep; Deflection; Elasticity (Mechanics); Loads; Methodology; Reinforced concrete; Shrinkage; Stiffness; Temperature; Tension; Time duration
• Uncontrolled Terms: Computation; Long term; Reinforced concrete beams; Tensile stress
• Old TRIS Terms: Bending stiffness
• ITRD Terms: 3472: Beam; 6464: Calculation; 4732: Creep (mater); 5586: Deflection; 5912: Elasticity; 5567: Load; 9110: Long term; 9102: Method; 4794: Reinforced concrete; 4743: Shrinkage; 6722: Temperature
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00452313
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, TRIS, ATRI
• Created Date: May 31 1986 12:00AM