Shear Strength of Unreinforced Masonry Wall Retrofitted with Fiber Reinforced Polymer and Hybrid Sheet

Unreinforced masonry (URM) structures represent a significant portion of existing historical structures around the world. Recent earthquakes have shown the need for seismic retrofitting for URM structures. Various types of strengthening methods have been used for URM structures. In particular, a str...

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Main Authors: Yun-Cheul Choi, Hyun-Ki Choi, Dongkeun Lee, Chang Sik Choi
Format: Article
Language:English
Published: Hindawi Limited 2015-01-01
Series:International Journal of Polymer Science
Online Access:http://dx.doi.org/10.1155/2015/863057
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spelling doaj-a2808538c2e04b9a8827da516daa7e5f2020-11-24T23:41:25ZengHindawi LimitedInternational Journal of Polymer Science1687-94221687-94302015-01-01201510.1155/2015/863057863057Shear Strength of Unreinforced Masonry Wall Retrofitted with Fiber Reinforced Polymer and Hybrid SheetYun-Cheul Choi0Hyun-Ki Choi1Dongkeun Lee2Chang Sik Choi3Department of Building Equipment and Fire Protection System, Chungwoon University, Chungnam 350-701, Republic of KoreaDepartment of Fire and Disaster Prevention Engineering, Kyungnam University, Gyeongsangnam-do 631-701, Republic of KoreaDepartment of Civil Engineering, Antalya International University, 07190 Antalya, TurkeyDepartment of Architectural Engineering, Hanyang University, Seoul 133-791, Republic of KoreaUnreinforced masonry (URM) structures represent a significant portion of existing historical structures around the world. Recent earthquakes have shown the need for seismic retrofitting for URM structures. Various types of strengthening methods have been used for URM structures. In particular, a strengthening technique using externally bonded (EB) fiber reinforced polymer (FRP) composites has attracted engineers since EB FRP materials effectively enhance the shear strength of URM walls with negligible change to cross-sectional area and weight of the walls. Research has been extensively conducted to determine characteristics of URM walls strengthened with EB FRP materials. However, it is still difficult to determine an appropriate retrofitting level due to the complexity of mechanical behavior of strengthened URM walls. In this study, in-plane behavior under lateral loading was, therefore, investigated on a full-scale nonstrengthened URM wall and URM walls retrofitted with two different FRP materials: carbon (CFRP) and hybrid (HFRP) sheets. The test results indicated that both FRP composites were effective in increasing shear strength in comparison with the control specimen. However, better performance was obtained with HFRP compared to CFRP. In addition, an equation for estimating effective strain was proposed, and the theoretical results were in good agreement with the experimental ones.http://dx.doi.org/10.1155/2015/863057
collection DOAJ
language English
format Article
sources DOAJ
author Yun-Cheul Choi
Hyun-Ki Choi
Dongkeun Lee
Chang Sik Choi
spellingShingle Yun-Cheul Choi
Hyun-Ki Choi
Dongkeun Lee
Chang Sik Choi
Shear Strength of Unreinforced Masonry Wall Retrofitted with Fiber Reinforced Polymer and Hybrid Sheet
International Journal of Polymer Science
author_facet Yun-Cheul Choi
Hyun-Ki Choi
Dongkeun Lee
Chang Sik Choi
author_sort Yun-Cheul Choi
title Shear Strength of Unreinforced Masonry Wall Retrofitted with Fiber Reinforced Polymer and Hybrid Sheet
title_short Shear Strength of Unreinforced Masonry Wall Retrofitted with Fiber Reinforced Polymer and Hybrid Sheet
title_full Shear Strength of Unreinforced Masonry Wall Retrofitted with Fiber Reinforced Polymer and Hybrid Sheet
title_fullStr Shear Strength of Unreinforced Masonry Wall Retrofitted with Fiber Reinforced Polymer and Hybrid Sheet
title_full_unstemmed Shear Strength of Unreinforced Masonry Wall Retrofitted with Fiber Reinforced Polymer and Hybrid Sheet
title_sort shear strength of unreinforced masonry wall retrofitted with fiber reinforced polymer and hybrid sheet
publisher Hindawi Limited
series International Journal of Polymer Science
issn 1687-9422
1687-9430
publishDate 2015-01-01
description Unreinforced masonry (URM) structures represent a significant portion of existing historical structures around the world. Recent earthquakes have shown the need for seismic retrofitting for URM structures. Various types of strengthening methods have been used for URM structures. In particular, a strengthening technique using externally bonded (EB) fiber reinforced polymer (FRP) composites has attracted engineers since EB FRP materials effectively enhance the shear strength of URM walls with negligible change to cross-sectional area and weight of the walls. Research has been extensively conducted to determine characteristics of URM walls strengthened with EB FRP materials. However, it is still difficult to determine an appropriate retrofitting level due to the complexity of mechanical behavior of strengthened URM walls. In this study, in-plane behavior under lateral loading was, therefore, investigated on a full-scale nonstrengthened URM wall and URM walls retrofitted with two different FRP materials: carbon (CFRP) and hybrid (HFRP) sheets. The test results indicated that both FRP composites were effective in increasing shear strength in comparison with the control specimen. However, better performance was obtained with HFRP compared to CFRP. In addition, an equation for estimating effective strain was proposed, and the theoretical results were in good agreement with the experimental ones.
url http://dx.doi.org/10.1155/2015/863057
work_keys_str_mv AT yuncheulchoi shearstrengthofunreinforcedmasonrywallretrofittedwithfiberreinforcedpolymerandhybridsheet
AT hyunkichoi shearstrengthofunreinforcedmasonrywallretrofittedwithfiberreinforcedpolymerandhybridsheet
AT dongkeunlee shearstrengthofunreinforcedmasonrywallretrofittedwithfiberreinforcedpolymerandhybridsheet
AT changsikchoi shearstrengthofunreinforcedmasonrywallretrofittedwithfiberreinforcedpolymerandhybridsheet
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