Effect of composite material confinement on bond strength between lap-spliced bars and concrete

Dionysis A. Bournas; Thanasis T. Triantafillou

Effect of composite material confinement on bond strength between lap-spliced bars and concrete

Dionysis A. Bournas, Thanasis T. Triantafillou

Civil Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

The effectiveness of fiber-reinforced polymer (FRP) and textile-reinforced mortar (TRM) jackets was investigated experimentally and analytically in this study as a means of confining old-type reinforced concrete (RC) columns with limited capacity due to 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 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 design equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.

Original language	English (US)
Title of host publication	3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference
Subtitle of host publication	Think Globally, Build Locally, Proceedings
Publisher	Precast Prestressed Concrete Institute
ISBN (Electronic)	9780937040904
State	Published - 2010
Event	3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference 2010 - Washington, United States Duration: May 29 2010 → Jun 2 2010

Publication series

Name	3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings

Other

Other	3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference 2010
Country/Territory	United States
City	Washington
Period	5/29/10 → 6/2/10

Keywords

Bond strength
Confinement
FRP
Lap splices
Seismic retrofitting
Textile-reinforced mortar (TRM)

ASJC Scopus subject areas

Building and Construction
Civil and Structural Engineering

Cite this

Bournas, D. A., & Triantafillou, T. T. (2010). Effect of composite material confinement on bond strength between lap-spliced bars and concrete. In 3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings (3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings). Precast Prestressed Concrete Institute.

Effect of composite material confinement on bond strength between lap-spliced bars and concrete. / Bournas, Dionysis A.; Triantafillou, Thanasis T.
3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings. Precast Prestressed Concrete Institute, 2010. (3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Bournas, DA & Triantafillou, TT 2010, Effect of composite material confinement on bond strength between lap-spliced bars and concrete. in 3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings. 3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings, Precast Prestressed Concrete Institute, 3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference 2010, Washington, United States, 5/29/10.

Bournas DA, Triantafillou TT. Effect of composite material confinement on bond strength between lap-spliced bars and concrete. In 3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings. Precast Prestressed Concrete Institute. 2010. (3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings).

Bournas, Dionysis A. ; Triantafillou, Thanasis T. / Effect of composite material confinement on bond strength between lap-spliced bars and concrete. 3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings. Precast Prestressed Concrete Institute, 2010. (3rd International fib Congress and Exhibition, Incorporating the PCI Annual Convention and Bridge Conference: Think Globally, Build Locally, Proceedings).

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AB - The effectiveness of fiber-reinforced polymer (FRP) and textile-reinforced mortar (TRM) jackets was investigated experimentally and analytically in this study as a means of confining old-type reinforced concrete (RC) columns with limited capacity due to 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 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 design equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.

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KW - Confinement

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KW - Lap splices

KW - Seismic retrofitting

KW - Textile-reinforced mortar (TRM)

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ER -

Effect of composite material confinement on bond strength between lap-spliced bars and concrete

Abstract

Publication series

Other

Keywords

ASJC Scopus subject areas

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