Title:
Model for the Response of Reinforced Concrete Beams Strengthened by Concrete Overlays
Author(s):
M. Saiidi, S. Vrontinos, and B. Douglas
Publication:
Structural Journal
Volume:
87
Issue:
6
Appears on pages(s):
687-695
Keywords:
beams (supports); bond (concrete to concrete); computer programs; epoxy resins; flexural strength; models; moments; reinforced concrete; resurfacing; shear strength; strengthening; Structural Research
DOI:
10.14359/2985
Date:
11/1/1990
Abstract:
A model was developed to determine the yield and ultimate behavior of reinforced concrete overlays. The overlay may be on the compression or tension side (in which case it is reinforced). The constitutive relationships for concrete and steel are simple and familiar. The behavior at the interface between the overlay and the beam is simulated by a shear spring with a bilinear shear-slip relationship. The model was evaluated by comparing analytical results with the test data obtained for 14 beams. A reasonably close agreement between the calculated and measured moments and yield displacements was noted. The results of a parametric study showed that thick overlays on the compression side of heavily reinforced beams canincrease the interface shear, making the bond between the beam and overlay especially critical.