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Title |
Flexural Behavior of RC Beam Repaired with Polymer Mortar
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Authors |
조용인(Yong-In Cho) ; 한상훈(Sang-Hoon Han) ; 박재규(Jea-Kyu Park) ; 연영모(Yeong-Mo Yeon) ; 홍기남(Ki-Nam Hong) |
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DOI |
https://doi.org/10.11112/jksmi.2017.21.1.091 |
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Keywords |
재령 ; 연성지수 ; 비선형해석 ; 폴리머 모르타르 ; 보수 Curing age ; Ductility index ; Nonlinear analysis ; Polymer mortar ; Repair |
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Abstract |
The purpose of this paper is to evaluate the flexural performance of reinforced concrete (RC) beams repaired with polymer mortar. The repaired and non-repaired 13th beams which was fabricated by considering repair position, repair depth, and curing age of polymer mortar as test variables were tested under three point loading. All specimens repaired in compressive and tensile zone did not fail due to interfacial failure between polymer mortar and concrete but failed when the strain of repaired mortar exceeded the ultimate tensile strain of polymer mortar. Maximum load of specimens repaired in compressive zone was similar to that of non-repaired specimen, reference specimen. Additionally, their ductility index was higher than that of reference specimen. On the other hand, specimens repaired in tensile zone failed very brittlely and have a lower ductility index than reference specimen. Nonlinear analysis by using OpenSees was performed to predict the behavior of RC beam repaired with polymer mortar. Two dimension frame element was used to simplify an analysis model and fiber model was applied to consider the material non-linearity. It was confirmed from the analysis results that nonlinear analysis properly predicts the behavior of specimens repaired in compressive zone and overestimates the behavior of specimens repaired in tensile zone.
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