Abstract
The effectiveness of fiber-reinforced polymer (FRP) and textile-reinforced mortar (TRM) jackets was investigated experimentally and analytically in this study to confine old-type reinforced concrete (RC) columns with limited capacity because of bond failure at lap-splice regions. The local bond strength between lap-spliced bars and concrete was measured experimentally along the lap-splice region of six full-scale RC columns subjected to cyclic uniaxial flexure under constant axial load. The bond strength of the two column specimens tested without retrofitting was found to be in good agreement with the predictions given by two existing bond models. These models were modified to account for the contribution of composite material jacketing to the bond resistance between lap-spliced bars and concrete. The effectiveness of FRP and TRM jackets against splitting at lap splices was quantified as a function of jacket properties and geometry as well as in terms of the jacket effective strain, which was found to depend on the ratio of lap-splice length to bar diameter. Consequently, simple equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 156-167 |
| Number of pages | 12 |
| Journal | Journal of Composites for Construction |
| Volume | 15 |
| Issue number | 2 |
| DOIs | |
| State | Published - Mar 1 2011 |
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Keywords
- Bars
- Bond strength
- Bonding
- Confinement
- Fiber reinforced polymer
- FRP
- Lap splices
- Mortars
- Rehabilitation
- Reinforced concrete
- Seismic effects
- Seismic retrofitting
- Slip
- Textile-reinforced mortar
ASJC Scopus subject areas
- Ceramics and Composites
- Civil and Structural Engineering
- Building and Construction
- Mechanics of Materials
- Mechanical Engineering
Cite this
Bond strength of lap-spliced bars in concrete confined with composite Jackets. / Bournas, D. A.; Triantafillou, Thanasis.
In: Journal of Composites for Construction, Vol. 15, No. 2, 01.03.2011, p. 156-167.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Bond strength of lap-spliced bars in concrete confined with composite Jackets
AU - Bournas, D. A.
AU - Triantafillou, Thanasis
PY - 2011/3/1
Y1 - 2011/3/1
N2 - The effectiveness of fiber-reinforced polymer (FRP) and textile-reinforced mortar (TRM) jackets was investigated experimentally and analytically in this study to confine old-type reinforced concrete (RC) columns with limited capacity because of bond failure at lap-splice regions. The local bond strength between lap-spliced bars and concrete was measured experimentally along the lap-splice region of six full-scale RC columns subjected to cyclic uniaxial flexure under constant axial load. The bond strength of the two column specimens tested without retrofitting was found to be in good agreement with the predictions given by two existing bond models. These models were modified to account for the contribution of composite material jacketing to the bond resistance between lap-spliced bars and concrete. The effectiveness of FRP and TRM jackets against splitting at lap splices was quantified as a function of jacket properties and geometry as well as in terms of the jacket effective strain, which was found to depend on the ratio of lap-splice length to bar diameter. Consequently, simple equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.
AB - The effectiveness of fiber-reinforced polymer (FRP) and textile-reinforced mortar (TRM) jackets was investigated experimentally and analytically in this study to confine old-type reinforced concrete (RC) columns with limited capacity because of bond failure at lap-splice regions. The local bond strength between lap-spliced bars and concrete was measured experimentally along the lap-splice region of six full-scale RC columns subjected to cyclic uniaxial flexure under constant axial load. The bond strength of the two column specimens tested without retrofitting was found to be in good agreement with the predictions given by two existing bond models. These models were modified to account for the contribution of composite material jacketing to the bond resistance between lap-spliced bars and concrete. The effectiveness of FRP and TRM jackets against splitting at lap splices was quantified as a function of jacket properties and geometry as well as in terms of the jacket effective strain, which was found to depend on the ratio of lap-splice length to bar diameter. Consequently, simple equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.
KW - Bars
KW - Bond strength
KW - Bonding
KW - Confinement
KW - Fiber reinforced polymer
KW - FRP
KW - Lap splices
KW - Mortars
KW - Rehabilitation
KW - Reinforced concrete
KW - Seismic effects
KW - Seismic retrofitting
KW - Slip
KW - Textile-reinforced mortar
UR - http://www.scopus.com/inward/record.url?scp=79954460709&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=79954460709&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)CC.1943-5614.0000078
DO - 10.1061/(ASCE)CC.1943-5614.0000078
M3 - Article
AN - SCOPUS:79954460709
VL - 15
SP - 156
EP - 167
JO - Journal of Composites for Construction
JF - Journal of Composites for Construction
SN - 1090-0268
IS - 2
ER -