Static and Cyclic Loading of RC Beams Upgraded by Jacketing


  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal


Title: Static and Cyclic Loading of RC Beams Upgraded by Jacketing

Author(s): Hee Kiat Cheong and Niall MacAlevey

Publication: Special Publication

Volume: 172


Appears on pages(s): 225-246

Keywords: Beams (supports); cyclic loads; reinforced concrete; shear properties; strength

Date: 12/1/1999

Strengthening of existing reinforced concrete beams is commonly carried-out by “jacketing”. This paper describes an experimental investigation into the behaviour of reinforced concrete beams strengthened by jacketing. Static and cyclic load tests to failure were carried-out on 12 reinforced concrete T-beams. The main variables examined were the degree of roughening of the surface of the original concrete, and the anchorage of the additional transverse reinforcement. The additional concrete was preplaced aggregate concrete. The strength of the bond between preplaced aggregate concrete and plain concrete was assessed by 39 slant shear tests, and a Mohr-Coulomb type failure envelope was derived. Static failure of the beam specimens was related to this failure envelope. The experimental results allowed conclusions to be reached on: the use of the slant shear test to predict the behaviour of full scale beams; the use of the Compressive Force Path Concept to enable reliable and economical strengthening of reinforced concrete beams; and the effect of cyclic loading on the ultimate load carrying capacity of jacketed beams.