Title:
Laboratory Investigation of Shear Repair of Reinforced Concrete Beams Loaded in Flexure
Author(s):
Frank Collins and Harold Roper
Publication:
Materials Journal
Volume:
87
Issue:
2
Appears on pages(s):
149-159
Keywords:
beams (supports); bonding; epoxy resins; flexural strength; loads (forces); post-tensioning; repairs; shear strength; strengthening; tests; Materials Research
DOI:
10.14359/1964
Date:
3/1/1990
Abstract:
The structural rehabilitation of reinforced concrete beams in shear was studied, with particular attention paid to resin injection. Other shear repair techniques that were examined include post-tensioning in shear, bar bonding, and stitching. Emphasis was placed on the influence of damage across the repair interface due to unloading while propping during the repair stage. A series of model beams, unreinforced in shear, were loaded in the laboratory until a major diagonal tension crack developed on both shear spans. Individual beams were unloaded to a set proportion of that load, repaired, and again loaded to failure. Scaled field-size beams were also tested. The repair strength achieved for resin-injected reinforced concrete beams was shown to be influenced by the condition of the major diagonal crack after initial damage. This conclusion was supported by surface strain measurements, load-deflection data, and crack measurements.