Title:
Behavior of Reinforced Concrete Slabs Strengthened in Flexure by Concrete Overlays
Author(s):
J.M. Calixto, E.F. Pires, S.A. Lima,
and E.M. Piancastelli
Publication:
Symposium Paper
Volume:
229
Issue:
Appears on pages(s):
389-406
Keywords:
bond; concrete overlays; flexural strengthening; shear connectors; slabs
DOI:
10.14359/14749
Date:
9/1/2005
Abstract:
The results of an experimental investigation on the behavior of one-way reinforced concrete slabs strengthened in flexure with a 5-cm concrete overlay are presented. Shear transfer at the concrete interface was provided in two separate ways: bond between the overlay and concrete substrate and dowel action only through shear connectors. Four series of slabs were tested: Series 2 and 3 were strengthened; Series 1 and 4 were cast at one time and had the geometry corresponded to the slabs before and after intervention, respectively. During the experiments, displacements, interlayer slips and strains were measured. The test results indicate expressively the better performance of slabs strengthened with a bonded overlay. A design procedure for evaluating the behavior of both repair procedures in service and at failure is proposed. Good correlation was also achieved.