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Strength and ductility of RC beams strengthened with steel-reinforced strain hardening cementitious composites

Authors :
Hussein, Mohamed
Kunieda, Minoru
Nakamura, Hikaru
Source :
Cement & Concrete Composites. Oct2012, Vol. 34 Issue 9, p1061-1066. 6p.
Publication Year :
2012

Abstract

Abstract: Strengthening of Reinforced Concrete (RC) beams using strain hardening cementitious composites (SHCCs) layer cast to their soffit has recently been investigated. That work confirmed that strain localization occurs in the SHCC-strengthening layer, which severely limits the ductility of the strengthened beam. This paper reports the ductility enhancement achieved in tests on reinforced concrete beams that were strengthened with lightly steel-reinforced SHCC layer (0.3% and 0.6% steel reinforcement ratio). It has been found that the combination of the SHCC and a small amount of steel reinforcement helps develop higher strain in the SHCC strengthening layer at ultimate load and eliminates the observed early strain localization. The recorded averaged strain at ultimate load of SHCC-strengthening layer provided with 0.3% and 0.6% steel reinforcement was 2.10 and 3.76 times that of an unreinforced SHCC layer. Also, use of a 0.6% reinforcement ratio changed the mode of failure of the SHCC-strengthened beams from brittle to more ductile. Moreover, the SHCC-strengthening layer with 0.6% reinforcement ratio was able to develop uniformly distributed visible cracks, which were the only indication that failure was imminent. It needs to be emphasized that strengthening of RC structures using an unreinforced SHCC layer may lead to a brittle failure. [Copyright &y& Elsevier]

Details

Language :
English
ISSN :
09589465
Volume :
34
Issue :
9
Database :
Academic Search Index
Journal :
Cement & Concrete Composites
Publication Type :
Academic Journal
Accession number :
78144039
Full Text :
https://doi.org/10.1016/j.cemconcomp.2012.06.004