CRACKING IN REINFORCED CONCRETE MEMBERS CAUSED BY RESIDUAL STRESSES AND STRESSES RESULTING FROM VARIATIONS IN TEMPERATURE

ZUR FRAGE DER RISSILDUNG DURCH EIGEN-UND ZWANGSPANNUNGEN INFOLGE TEMPERATUR IN STAHLBETONBAUTEILEN

The first part of this report considers the theoretical relations between variations in the temperature of reinforced concrete members and resulting stresses, caused by uniaxial deformations. Residual stress values were shown to be always lower than the tensile strength value of the concrete. Other stresses due to external deformations are superimposed on the residual stresses. According to the distribution of stresses along the section, cracking appears suddenly or gradually along the whole section if the stresses equal the tensile strength. Based on formulae for cracking, relations have been derived by means of which the quantity of reinforcement and the diameter of the bars can be determined for a given dimension of the cracks. Similarly the variation in normal stress stiffness can be calculated at the time of cracking. The second part of the report compares theoretical studies with results of tests on reinforced concrete prisms varying in reinforcement percentage and reinforcement diameter. The prisms were heated up to 80 degrees C, the air cooled to 20 degrees C. Results concerning the percentage of reinforcement needed for given crack dimensions are presented. /IRRD/

• Corporate Authors:

  Deutscher Ausschuss fuer Stahlbeton

  Berlin-Wilmersdorf,   Germany 
• Authors:
  • Falkner, H
• Publication Date: 1969

Language

• German

Media Info

• Features: Figures; Photos; References; Tables;
• Pagination: 100 p.
• Serial:
  • Issue Number: 208

Subject/Index Terms

• TRT Terms: Concrete; Cracking; Deformation; Deformation curve; Formulas; Fracture mechanics; Material reinforcement; Reinforced concrete; Residual stress; Size; Stiffness; Stresses; Temperature; Tension; Theory
• Uncontrolled Terms: Concrete cracking; Tensile stress
• Old TRIS Terms: Test results
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00081812
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Jul 15 1975 12:00AM