Numerical Modeling for Damaged Reinforced Concrete Slab Strengthened by Ultra-High Performance Concrete (UHPC) Layer
Ultra-high performance concrete (UHPC) has been developed as an innovative cementitious based material. It can be used for repairing and strengthening existing reinforced concrete (RC) structures because of its excellent mechanical performance, such as high tensile and compressive strengths, long-term durability, and low permeability. However, when using UHPC to strengthen existing RC structures for flexure members, there is limited information on simulating existed cracks in RC structures and considering interface modeling between RC substrate and UHPC overlay. This research developed a finite element (FE) model to investigate flexural behaviors of UHPC-RC composite slab with introducing existed cracks in RC substrate by geometry discontinuous, approximately matched with experimental results previously published by the authors. Meanwhile, based on recent research on the bond strength of UHPC to concrete, a UHPC-RC interfacial model was included in the FE model. The FE model was validated with experimental laboratory results previously published by the authors, and a good agreement was obtained between numerical and experimental results. Finally, a parameter study was conducted to investigate the strengthening effects and optimizing strengthening parameters by using the developed FE model. Results showed that the effect of existing cracks on the ultimate flexure capacity of UHPC-RC cannot be neglected, and the interface model has a precise accuracy in FE modeling.
Y. Zhu et al., "Numerical Modeling for Damaged Reinforced Concrete Slab Strengthened by Ultra-High Performance Concrete (UHPC) Layer," Engineering Structures, vol. 209, Elsevier Ltd, Apr 2020.
The definitive version is available at https://doi.org/10.1016/j.engstruct.2019.110031
Civil, Architectural and Environmental Engineering
INSPIRE - University Transportation Center
Keywords and Phrases
Cracks; Finite Element Model; Interface Model; Reinforced Concrete Slab; Strengthen; UHPC; Ultra-High Performance Concrete
International Standard Serial Number (ISSN)
Article - Journal
© 2020 Elsevier Ltd, All rights reserved.
01 Apr 2020