A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Shear-bending failure modeling of concrete ribbed slabs strengthened with UHPFRC
Highlights The current shear failure mechanism for rehabilitated beams with UHPFRC is not accurate enough when employed for T-beams or ribbed slabs. The proposed mechanism offers an approximate, yet simple, calculation for shear-bending failure by incorporating the contribution of reinforcing steel, the concrete in shear and the flexural resistance of the composite slab conformed by UHPFRC and concrete. The method is validated by means of an experimental campaign on existing concrete, more than 100 years old. This works describes the importance of taking into consideration the state of the existing concrete when developing the Finite Element model, and provides insight on the modelling procedure.
Abstract The use of Reinforced Ultra High Performance Fiber Reinforced Cementitious Composite (R-UHPFRC) materials in the strengthening of existing infrastructure has been more broadly exploited in recent years, although the main domain of application pertains to the rehabilitation of bridge slabs. In this work, the method is extended to the reinforcement of the ribbed slabs of an iconic building, situated in Zurich, Switzerland, where an increase on shear and bending capacity has been deemed necessary. Due to the uncertainties relating to the properties of the existing concrete, dated from 1913, laboratory tests were conducted on four specimens, for verifying the efficacy of the proposed strengthening solution. As a result of the experimental campaign, a novel analytical model for R-UHPFRC and Reinforced Concrete T-beams has been developed, which was validated with the help of a Finite Element (FE) simulations.
Shear-bending failure modeling of concrete ribbed slabs strengthened with UHPFRC
Highlights The current shear failure mechanism for rehabilitated beams with UHPFRC is not accurate enough when employed for T-beams or ribbed slabs. The proposed mechanism offers an approximate, yet simple, calculation for shear-bending failure by incorporating the contribution of reinforcing steel, the concrete in shear and the flexural resistance of the composite slab conformed by UHPFRC and concrete. The method is validated by means of an experimental campaign on existing concrete, more than 100 years old. This works describes the importance of taking into consideration the state of the existing concrete when developing the Finite Element model, and provides insight on the modelling procedure.
Abstract The use of Reinforced Ultra High Performance Fiber Reinforced Cementitious Composite (R-UHPFRC) materials in the strengthening of existing infrastructure has been more broadly exploited in recent years, although the main domain of application pertains to the rehabilitation of bridge slabs. In this work, the method is extended to the reinforcement of the ribbed slabs of an iconic building, situated in Zurich, Switzerland, where an increase on shear and bending capacity has been deemed necessary. Due to the uncertainties relating to the properties of the existing concrete, dated from 1913, laboratory tests were conducted on four specimens, for verifying the efficacy of the proposed strengthening solution. As a result of the experimental campaign, a novel analytical model for R-UHPFRC and Reinforced Concrete T-beams has been developed, which was validated with the help of a Finite Element (FE) simulations.
Shear-bending failure modeling of concrete ribbed slabs strengthened with UHPFRC
Martín-Sanz, H. (author) / Herraiz, B. (author) / Brühwiler, E. (author) / Chatzi, E. (author)
Engineering Structures ; 222
2020-05-20
Article (Journal)
Electronic Resource
English
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