TY - JOUR
T1 - Shear behavior of reinforced concrete beams repaired using a hybrid scheme with stainless steel rebars and CFRP sheets
AU - Hasan, Md Abul
AU - Akiyama, Mitsuyoshi
AU - Kojima, Keisuke
AU - Izumi, Naoki
N1 - Funding Information:
This work was financially supported by JSPS KAKENHI, Grant Numbers JP 16KK0152 and JP 19H0081. The authors express their sincere appreciation to Aichi Steel Corporation and Osaka Steel Co. Ltd for generous support in supplying reinforcements. The authors also acknowledge Chittagong University of Engineering and Technology for its assistance. The opinions presented in this paper are only those of the authors.
Funding Information:
This work was financially supported by JSPS KAKENHI , Grant Numbers JP 16KK0152 and JP 19H0081 . The authors express their sincere appreciation to Aichi Steel Corporation and Osaka Steel Co. Ltd for generous support in supplying reinforcements. The authors also acknowledge Chittagong University of Engineering and Technology for its assistance. The opinions presented in this paper are only those of the authors.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/1/11
Y1 - 2023/1/11
N2 - Repairing corroded flexural-deficient reinforced concrete (RC) structures using a hybrid scheme with stainless steel (SS) rebars and carbon-fiber-reinforced polymer (CFRP) sheets revealed excellent structural performance and contributes to lower maintenance costs in the remaining service life of the repaired structure. However, although cutting the bottom arm of stirrups in a hybrid repair method could affect the structural performance of shear-critical RC beams since this effect was not investigated in the past research. In this paper, structural performance of a group of shear-deficient RC beams repaired using the hybrid method is investigated experimentally to examine the effect of cutting the bottom arm of stirrup on the shear capacity of the repaired beams. The test variables included the longitudinal reinforcement types (i.e. carbon and SS), shear reinforcement configurations, and CFRP sheet wrapping schemes. Experimental results demonstrate that cutting the bottom arm of stirrup for replacing the corroded tensile rebar could significantly reduce the shear capacity of the retrofitted beams. Therefore, strengthening using CFRP sheet is needed to restore the shear performance of the retrofitted beams. Test results revealed that complete wrapping of CFRP sheet is effective to overcome the shear deficiency due to cutting the bottom arm of stirrup in the shear-critical RC beams. In addition, the effectiveness of CFRP sheet wrapping schemes on shear performance of SS-RC beams is approximately identical with that of CS-RC beams. Finally, a design methodology to repair the corroded RC bridge using hybrid method is developed and presented based on bending and shear tests.
AB - Repairing corroded flexural-deficient reinforced concrete (RC) structures using a hybrid scheme with stainless steel (SS) rebars and carbon-fiber-reinforced polymer (CFRP) sheets revealed excellent structural performance and contributes to lower maintenance costs in the remaining service life of the repaired structure. However, although cutting the bottom arm of stirrups in a hybrid repair method could affect the structural performance of shear-critical RC beams since this effect was not investigated in the past research. In this paper, structural performance of a group of shear-deficient RC beams repaired using the hybrid method is investigated experimentally to examine the effect of cutting the bottom arm of stirrup on the shear capacity of the repaired beams. The test variables included the longitudinal reinforcement types (i.e. carbon and SS), shear reinforcement configurations, and CFRP sheet wrapping schemes. Experimental results demonstrate that cutting the bottom arm of stirrup for replacing the corroded tensile rebar could significantly reduce the shear capacity of the retrofitted beams. Therefore, strengthening using CFRP sheet is needed to restore the shear performance of the retrofitted beams. Test results revealed that complete wrapping of CFRP sheet is effective to overcome the shear deficiency due to cutting the bottom arm of stirrup in the shear-critical RC beams. In addition, the effectiveness of CFRP sheet wrapping schemes on shear performance of SS-RC beams is approximately identical with that of CS-RC beams. Finally, a design methodology to repair the corroded RC bridge using hybrid method is developed and presented based on bending and shear tests.
KW - Carbon-fiber-reinforced polymer sheet
KW - Hybrid repair method
KW - Reinforced concrete beam
KW - Shear behavior
KW - Stainless steel
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U2 - 10.1016/j.conbuildmat.2022.129817
DO - 10.1016/j.conbuildmat.2022.129817
M3 - Article
AN - SCOPUS:85142875505
SN - 0950-0618
VL - 363
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 129817
ER -