CRACK SPACING AND CRACK WIDTHS DUE TO NORMAL FORCE OR BENDING MOMENT

This report deals with stable cracks in reinforced concrete structures subjected to tension and bending moments. The effect of shearing force is briefly discussed in connection with crack width. The report is based substantially on tests and references are made to a list of literature. All the observations recounted and the hypotheses put forward relate to cracks on the surface of the concrete over a reinforcing bar. All types of reinforcement, however, are treated with regard to the age and loading history of the structure and to the stress in the reinforcement. The influence of prestressing to varying degress is also teken into account. The ideas and hypotheses on which the work was based are summarized as follows: 1. It is possible to attain final values of crack spacing in a short time using test techniques. 2. In addition to deformations due to loads and restraints on the structure, crack widths also depend on the repetition and duration of these. They cannot therefore be reproduced in a short time. 3. Crack widths are to be studied in models, in order to compare with crack widths in structures, dueing decreasing load, since practically every structure has at one time carried a load greater than the one being considered. /TRRL/

• Corporate Authors:

  National Swedish Institute for Building Research

  Box 27 163, 102 52
  Stockholm,   Sweden 
• Authors:
  • Holmberg, A
  • LINDGREN, S
• Publication Date: 1970

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: 28 p.

Subject/Index Terms

• TRT Terms: Bending moments; Concrete; Cracking; Deformation; Loads; Mathematical models; Prestressing; Reinforced concrete; Shear stress; Tension; Testing; Width
• Uncontrolled Terms: Concrete cracking; Models; Shear forces
• Old TRIS Terms: Relative deformation
• ITRD Terms: 5211: Cracking; 5586: Deflection; 5595: Deformation; 5421: Force; 6237: Laboratory (not an organization); 6473: Mathematical model; 5410: Moment (force); 4794: Reinforced concrete; 3471: Reinforcement (in mater); 5531: Shear; 5502: Tension; 6255: Test; 5414: Time; 6479: Width
• Subject Areas: Bridges and other structures; Highways;

Filing Info

• Accession Number: 00081362
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Report/Paper Numbers: No. D2:1970
• Files: ITRD, TRIS
• Created Date: May 1 1975 12:00AM