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Interfacial shear behavior between UHPFRC layers and normal concrete substrate for shear-strengthened squat RC shear walls under cyclic loading
Highlights UHPFRC is eligible to enhance the performance of shear deficient RC shear walls. Results indicated that a significant contribution of UHPFRC to the strength, ductility, and stiffness of the original wall. Roughness and using steel shear connectors at the interface are crucial parameters. A numerical study was carried out to provide a deeper understanding of the interfacial degradation. A governing equation was derived to predict the shear strength capacity of UHPFRC strengthened walls.
Abstract This paper presents an experimental and numerical investigation on the significant effect of the bond properties between Ultra-high performance fiber reinforced concrete (UHPFRC) layers and normal strength concrete (NSC) on the performance of strengthened composite squat shear walls through shear cyclic tests. Moreover, governing equation was derived to predict the shear strength capacity of UHPFRC strengthened walls considering tensile strength of UHPFRC, thickness of UHPFRC layers, surface roughness degree, ratio of steel shear connectors and its yield strength, concrete strength and thickness of original RC wall, and the axial normal force. A series of numerical analyses had been carried out, so proving the capabilities of the proposed formulation. The results indicated that the concrete substrate surface roughness, use of shear connectors, and UHPFRC layers thickness significantly affect the shear bond behaviour between UHPFRC layers and concrete. Installation of shear connectors at UHPFRC-concrete interfaces could significantly improve the post-peak shear behaviour as well as altered the failure mode from brittle due to debonding to ductile. The layer's thickness had a high influence on the shear behavior of specimens with properly roughened surfaces.
Interfacial shear behavior between UHPFRC layers and normal concrete substrate for shear-strengthened squat RC shear walls under cyclic loading
Highlights UHPFRC is eligible to enhance the performance of shear deficient RC shear walls. Results indicated that a significant contribution of UHPFRC to the strength, ductility, and stiffness of the original wall. Roughness and using steel shear connectors at the interface are crucial parameters. A numerical study was carried out to provide a deeper understanding of the interfacial degradation. A governing equation was derived to predict the shear strength capacity of UHPFRC strengthened walls.
Abstract This paper presents an experimental and numerical investigation on the significant effect of the bond properties between Ultra-high performance fiber reinforced concrete (UHPFRC) layers and normal strength concrete (NSC) on the performance of strengthened composite squat shear walls through shear cyclic tests. Moreover, governing equation was derived to predict the shear strength capacity of UHPFRC strengthened walls considering tensile strength of UHPFRC, thickness of UHPFRC layers, surface roughness degree, ratio of steel shear connectors and its yield strength, concrete strength and thickness of original RC wall, and the axial normal force. A series of numerical analyses had been carried out, so proving the capabilities of the proposed formulation. The results indicated that the concrete substrate surface roughness, use of shear connectors, and UHPFRC layers thickness significantly affect the shear bond behaviour between UHPFRC layers and concrete. Installation of shear connectors at UHPFRC-concrete interfaces could significantly improve the post-peak shear behaviour as well as altered the failure mode from brittle due to debonding to ductile. The layer's thickness had a high influence on the shear behavior of specimens with properly roughened surfaces.
Interfacial shear behavior between UHPFRC layers and normal concrete substrate for shear-strengthened squat RC shear walls under cyclic loading
Nagib, Mohammed T. (author) / Sakr, Mohammed A. (author) / El-khoriby, Saher R. (author) / Khalifa, Tarek M. (author)
Engineering Structures ; 254
2022-01-03
Article (Journal)
Electronic Resource
English
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