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.
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