Title:
Shear Strengthening of Reinforced Concrete Beam with High-Performance Fiber-Reinforced Cementitious Composite Jacketing
Author(s):
Alberto Meda, Serena Mostosi, and Paolo Riva
Publication:
Structural Journal
Volume:
111
Issue:
5
Appears on pages(s):
1059-1068
Keywords:
fiber-reinforced concrete; high-performance concrete; high-performance fiber-reinforced cementitious composites (HPFRCCs); jacketing; shear strengthening
DOI:
10.14359/51687027
Date:
9/1/2014
Abstract:
The possibility of using thin high-performance jackets aimed at improving the structural and shear capacity of existing reinforced concrete members is investigated in this paper. The jackets are made of high-performance fiber-reinforced concrete, with a steel mesh fabric sometimes added (diameter of the wires = 2 mm [0.078 in.]; wire spacing = 25.4 mm [1 in.]; and ultimate strength of steel = 550 N/mm2 [79.8 ksi]). Two different high-performance cementitious
composites are investigated: a self-leveling concrete suitable for casting thin members, and a thixotropic concrete requiring no molds during casting operations. To assess the effectiveness of the proposed solutions, different jackets were used to reinforce short, simply supported reinforced concrete beams (2.85 m [9.35 ft] long) lacking stirrups. The beams
were tested up to failure in four-point bending, and the numerous test results, including a close comparison with the reference un-strengthened beam, are presented and discussed. The experimental results demonstrate the effectiveness of the technique proposed. All strengthened beams reached their theoretical bending capacity, whereas the unreinforced beam failed in shear.