PREDICTION OF PEELING FAILURE OF REINFORCED CONCRETE BEAMS WITH EXTERNALLY BONDED STEEL PLATES

A review of available literature on design against premature failure (due to plate peeling) of reinforced concrete beams strengthened by the gluing of mild steel plates to their soffits suggested strongly that there existed a number of unresolved problems in the field. The present paper reports details of a simple theoretical model which (in a systematic fashion) provides an insight into the mechanism of the appropriate mode of premature failure and the outcome of which is supported by an extensive set of test results from other sources. The final formulations, which do not use any calibration factors, provide upper and lower bounds to the magnitude of the critical axial tensile stress in the plate at the instance of peeling failure which is found to be the primary factor controlling the ultimate load. It is shown that the magnitude of this critical stress depends (among other factors) on the spacings of the flexural cracks in the concrete cover, and, owing to large variations in spacings of flexural cracks in practice, wide scatter is to be expected in the test data from even closely controlled experiments. It is therefore concluded that a lower bound approach would be the appropriate design technique. (A)

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 257-68
  • Serial:
    • Volume: 110
    • Issue Number: 3

Subject/Index Terms

Filing Info

  • Accession Number: 00712411
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Oct 24 1995 12:00AM