New retrofitting method for rectangular high strength RC columns by CFS jacketing after octagonal cross section shape conversion

Jang Jay Ho Kim, Tae Kyun Kim, Jin Won Choi, Seung Jai Choi, Dong Woo Shin, Jae Ho Shin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Numerous studies showed that safety and serviceability of many concrete infrastructures and buildings built in 1970's have far less strength capacities than their design capacities and thereby require immediate retrofitting. Currently, these aged concrete structures are being repaired using many repair and strengthening methods developed in the past. Unfortunately, the previously developed repair and strengthening methods did not fully utilize the structural member's unique mechanical characteristics. Therefore, the researches on repair and strengthening methods developed based on composite mechanical behavior between repairing material and original substrate, which can effectively improve strength, ductility, and failure mechanism are needed at this time. In addition, these repairing and strengthening method must focus on structural member constructed using high performance concrete to meet the demand of present construction trend of building mammoth structures. Therefore, in this study, a repairing and strengthening method for retrofitting high strength concrete (HSC) columns that can effectively improve the performance of HSC columns is developed. The square HSC column's crosssectional shape is converted to octagonal shape by attaching precast members on the surface of the column. Then, the octagonal column surface is jacketed using Carbon Fiber Sheets (CFS). The method allows maximum usage of confinement effect from externally jacketed CFS, which result in improved strength and ductility of repaired HSC columns. The research results are discussed in detail.

Original languageEnglish
Title of host publicationProceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014
EditorsRaafat El-Hacha
PublisherInternational Institute for FRP in Construction (IIFC)
ISBN (Electronic)9781771363082
Publication statusPublished - 2014 Jan 1
Event7th International Conference on FRP Composites in Civil Engineering, CICE 2014 - Vancouver, Canada
Duration: 2014 Aug 202014 Aug 22

Publication series

NameProceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014

Other

Other7th International Conference on FRP Composites in Civil Engineering, CICE 2014
CountryCanada
CityVancouver
Period14/8/2014/8/22

Fingerprint

Retrofitting
Carbon fibers
Concretes
Repair
Structural members
Strengthening (metal)
Ductility
High performance concrete
Concrete construction
carbon fiber
Composite materials
Substrates

All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Civil and Structural Engineering

Cite this

Kim, J. J. H., Kim, T. K., Choi, J. W., Choi, S. J., Shin, D. W., & Shin, J. H. (2014). New retrofitting method for rectangular high strength RC columns by CFS jacketing after octagonal cross section shape conversion. In R. El-Hacha (Ed.), Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014 (Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014). International Institute for FRP in Construction (IIFC).
Kim, Jang Jay Ho ; Kim, Tae Kyun ; Choi, Jin Won ; Choi, Seung Jai ; Shin, Dong Woo ; Shin, Jae Ho. / New retrofitting method for rectangular high strength RC columns by CFS jacketing after octagonal cross section shape conversion. Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014. editor / Raafat El-Hacha. International Institute for FRP in Construction (IIFC), 2014. (Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014).
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abstract = "Numerous studies showed that safety and serviceability of many concrete infrastructures and buildings built in 1970's have far less strength capacities than their design capacities and thereby require immediate retrofitting. Currently, these aged concrete structures are being repaired using many repair and strengthening methods developed in the past. Unfortunately, the previously developed repair and strengthening methods did not fully utilize the structural member's unique mechanical characteristics. Therefore, the researches on repair and strengthening methods developed based on composite mechanical behavior between repairing material and original substrate, which can effectively improve strength, ductility, and failure mechanism are needed at this time. In addition, these repairing and strengthening method must focus on structural member constructed using high performance concrete to meet the demand of present construction trend of building mammoth structures. Therefore, in this study, a repairing and strengthening method for retrofitting high strength concrete (HSC) columns that can effectively improve the performance of HSC columns is developed. The square HSC column's crosssectional shape is converted to octagonal shape by attaching precast members on the surface of the column. Then, the octagonal column surface is jacketed using Carbon Fiber Sheets (CFS). The method allows maximum usage of confinement effect from externally jacketed CFS, which result in improved strength and ductility of repaired HSC columns. The research results are discussed in detail.",
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Kim, JJH, Kim, TK, Choi, JW, Choi, SJ, Shin, DW & Shin, JH 2014, New retrofitting method for rectangular high strength RC columns by CFS jacketing after octagonal cross section shape conversion. in R El-Hacha (ed.), Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014. Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014, International Institute for FRP in Construction (IIFC), 7th International Conference on FRP Composites in Civil Engineering, CICE 2014, Vancouver, Canada, 14/8/20.

New retrofitting method for rectangular high strength RC columns by CFS jacketing after octagonal cross section shape conversion. / Kim, Jang Jay Ho; Kim, Tae Kyun; Choi, Jin Won; Choi, Seung Jai; Shin, Dong Woo; Shin, Jae Ho.

Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014. ed. / Raafat El-Hacha. International Institute for FRP in Construction (IIFC), 2014. (Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AU - Kim, Tae Kyun

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N2 - Numerous studies showed that safety and serviceability of many concrete infrastructures and buildings built in 1970's have far less strength capacities than their design capacities and thereby require immediate retrofitting. Currently, these aged concrete structures are being repaired using many repair and strengthening methods developed in the past. Unfortunately, the previously developed repair and strengthening methods did not fully utilize the structural member's unique mechanical characteristics. Therefore, the researches on repair and strengthening methods developed based on composite mechanical behavior between repairing material and original substrate, which can effectively improve strength, ductility, and failure mechanism are needed at this time. In addition, these repairing and strengthening method must focus on structural member constructed using high performance concrete to meet the demand of present construction trend of building mammoth structures. Therefore, in this study, a repairing and strengthening method for retrofitting high strength concrete (HSC) columns that can effectively improve the performance of HSC columns is developed. The square HSC column's crosssectional shape is converted to octagonal shape by attaching precast members on the surface of the column. Then, the octagonal column surface is jacketed using Carbon Fiber Sheets (CFS). The method allows maximum usage of confinement effect from externally jacketed CFS, which result in improved strength and ductility of repaired HSC columns. The research results are discussed in detail.

AB - Numerous studies showed that safety and serviceability of many concrete infrastructures and buildings built in 1970's have far less strength capacities than their design capacities and thereby require immediate retrofitting. Currently, these aged concrete structures are being repaired using many repair and strengthening methods developed in the past. Unfortunately, the previously developed repair and strengthening methods did not fully utilize the structural member's unique mechanical characteristics. Therefore, the researches on repair and strengthening methods developed based on composite mechanical behavior between repairing material and original substrate, which can effectively improve strength, ductility, and failure mechanism are needed at this time. In addition, these repairing and strengthening method must focus on structural member constructed using high performance concrete to meet the demand of present construction trend of building mammoth structures. Therefore, in this study, a repairing and strengthening method for retrofitting high strength concrete (HSC) columns that can effectively improve the performance of HSC columns is developed. The square HSC column's crosssectional shape is converted to octagonal shape by attaching precast members on the surface of the column. Then, the octagonal column surface is jacketed using Carbon Fiber Sheets (CFS). The method allows maximum usage of confinement effect from externally jacketed CFS, which result in improved strength and ductility of repaired HSC columns. The research results are discussed in detail.

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M3 - Conference contribution

T3 - Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014

BT - Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014

A2 - El-Hacha, Raafat

PB - International Institute for FRP in Construction (IIFC)

ER -

Kim JJH, Kim TK, Choi JW, Choi SJ, Shin DW, Shin JH. New retrofitting method for rectangular high strength RC columns by CFS jacketing after octagonal cross section shape conversion. In El-Hacha R, editor, Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014. International Institute for FRP in Construction (IIFC). 2014. (Proceedings of the 7th International Conference on FRP Composites in Civil Engineering, CICE 2014).