Short term creep tests of low strength rectangular concrete members jacketed with carbon FRP sheets

Cem Demir; Aygul Aydogmus; Alper Ilki

Short term creep tests of low strength rectangular concrete members jacketed with carbon FRP sheets

Cem Demir, Aygul Aydogmus, Alper Ilki

Department of Civil Engineering

Istanbul Technical University

Research output: Contribution to conference › Paper › peer-review

1 Citation (Scopus)

Abstract

Usage of low strength concrete is common in many developing countries all around the World. For example, in Turkey, the approximate average concrete compressive strength of existing reinforced concrete buildings constructed before 1990s is around 10 MPa. Since the concrete strength is foreseen higher during structural design, the sustained axial stresses of columns of such existing buildings may be remarkably high (70~90% of axial capacity). These high axial stresses sometimes cause collapse of columns or overall structure due to effects of creep of concrete. The service life of such structures can be enhanced through external jacketing of columns with FRP sheets. The efficiency of such a rehabilitation is higher in case of low strength concrete. In this study, the short term creep behavior of carbon FRP sheet jacketed low strength (~7 MPa) rectangular concrete prisms is investigated under varying levels of sustained axial stresses. The safe lifetime of the specimens are extrapolated considering the variations in axial and transverse strains measured during short term creep tests (48~96 hours). In addition, the residual capacities of carbon FRP jacketed rectangular prism specimens are investigated after being subjected to short term creep tests.

Original language	English
Publication status	Published - 1 Jan 2012
Event	3rd Asia-Pacific Conference on FRP in Structures, APFIS 2012 - Sapporo, Japan Duration: 2 Feb 2012 → 4 Feb 2012

Conference

Conference	3rd Asia-Pacific Conference on FRP in Structures, APFIS 2012
Country/Territory	Japan
City	Sapporo
Period	2/02/12 → 4/02/12

Bibliographical note

Publisher Copyright:
© APFIS 2012.All rights reserved.

Funding

The authors wish to thank ISTON Company for supplying the concrete of the specimens. Contributions of BASF Turkey Company is greatly acknowledged for financially supporting the second author and supplying the FRP and epoxy materials. Tests were carried out at the Construction Materials Laboratory of Istanbul Technical University. The authors would like to thank Prof.Dr. Mehmet Ali Tasdemir for making usage of Instron machine at this laboratory possible.

Funders	Funder number
ISTON
BASF
Istanbul Teknik Üniversitesi

Keywords

Carbon fiber
Confinement
Creep
Low strength concrete
Rectangular cross-section
Retrofit
Sustained loading

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Cite this

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title = "Short term creep tests of low strength rectangular concrete members jacketed with carbon FRP sheets",

abstract = "Usage of low strength concrete is common in many developing countries all around the World. For example, in Turkey, the approximate average concrete compressive strength of existing reinforced concrete buildings constructed before 1990s is around 10 MPa. Since the concrete strength is foreseen higher during structural design, the sustained axial stresses of columns of such existing buildings may be remarkably high (70~90% of axial capacity). These high axial stresses sometimes cause collapse of columns or overall structure due to effects of creep of concrete. The service life of such structures can be enhanced through external jacketing of columns with FRP sheets. The efficiency of such a rehabilitation is higher in case of low strength concrete. In this study, the short term creep behavior of carbon FRP sheet jacketed low strength (~7 MPa) rectangular concrete prisms is investigated under varying levels of sustained axial stresses. The safe lifetime of the specimens are extrapolated considering the variations in axial and transverse strains measured during short term creep tests (48~96 hours). In addition, the residual capacities of carbon FRP jacketed rectangular prism specimens are investigated after being subjected to short term creep tests.",

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T1 - Short term creep tests of low strength rectangular concrete members jacketed with carbon FRP sheets

AU - Demir, Cem

AU - Aydogmus, Aygul

AU - Ilki, Alper

PY - 2012/1/1

Y1 - 2012/1/1

N2 - Usage of low strength concrete is common in many developing countries all around the World. For example, in Turkey, the approximate average concrete compressive strength of existing reinforced concrete buildings constructed before 1990s is around 10 MPa. Since the concrete strength is foreseen higher during structural design, the sustained axial stresses of columns of such existing buildings may be remarkably high (70~90% of axial capacity). These high axial stresses sometimes cause collapse of columns or overall structure due to effects of creep of concrete. The service life of such structures can be enhanced through external jacketing of columns with FRP sheets. The efficiency of such a rehabilitation is higher in case of low strength concrete. In this study, the short term creep behavior of carbon FRP sheet jacketed low strength (~7 MPa) rectangular concrete prisms is investigated under varying levels of sustained axial stresses. The safe lifetime of the specimens are extrapolated considering the variations in axial and transverse strains measured during short term creep tests (48~96 hours). In addition, the residual capacities of carbon FRP jacketed rectangular prism specimens are investigated after being subjected to short term creep tests.

AB - Usage of low strength concrete is common in many developing countries all around the World. For example, in Turkey, the approximate average concrete compressive strength of existing reinforced concrete buildings constructed before 1990s is around 10 MPa. Since the concrete strength is foreseen higher during structural design, the sustained axial stresses of columns of such existing buildings may be remarkably high (70~90% of axial capacity). These high axial stresses sometimes cause collapse of columns or overall structure due to effects of creep of concrete. The service life of such structures can be enhanced through external jacketing of columns with FRP sheets. The efficiency of such a rehabilitation is higher in case of low strength concrete. In this study, the short term creep behavior of carbon FRP sheet jacketed low strength (~7 MPa) rectangular concrete prisms is investigated under varying levels of sustained axial stresses. The safe lifetime of the specimens are extrapolated considering the variations in axial and transverse strains measured during short term creep tests (48~96 hours). In addition, the residual capacities of carbon FRP jacketed rectangular prism specimens are investigated after being subjected to short term creep tests.

KW - Carbon fiber

KW - Confinement

KW - Creep

KW - Low strength concrete

KW - Rectangular cross-section

KW - Retrofit

KW - Sustained loading

UR - http://www.scopus.com/inward/record.url?scp=85088055948&partnerID=8YFLogxK

M3 - Paper

AN - SCOPUS:85088055948

T2 - 3rd Asia-Pacific Conference on FRP in Structures, APFIS 2012

Y2 - 2 February 2012 through 4 February 2012

ER -

Short term creep tests of low strength rectangular concrete members jacketed with carbon FRP sheets

Abstract

Conference

Bibliographical note

Funding

Keywords

UN SDGs

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Cite this