Engineering Structures

Volume 292, 1 October 2023, 116514
Engineering Structures

Behavior of reinforced concrete stair slabs strengthened with steel plates and near surface mounted steel bars

https://doi.org/10.1016/j.engstruct.2023.116514Get rights and content
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  • Experiments of RC stair slabs strengthened with steel plates and bars are reported.

  • Inelastic finite element modeling of strengthened RC stair slabs is described.

  • The strengthening techniques significantly improve the performance of RC stair slabs.

  • The FE model is shown to predict well the responses of strengthened RC stair slabs.


The bends in Reinforced Concrete Stair Slabs (RCSS) subjected to opening moments may be damaged due to improper detailing of tensile reinforcement or construction errors. The damaged bends in RCSS need to be strengthened to restore their flexural strengths. However, there are very limited investigations into the behavior of strengthened RCSS. This paper reports experimental and simulation works on the structural behavior of RCSS strengthened with externally bonded steel plates and near surface mounted steel bars. The test program and results of six full-scale strengthened RCSS loaded to failure are described in detail. A finite element model is developed using ABAQUS to simulate the experimentally measured responses of strengthened RCSS. It is shown that the utilized strengthening techniques significantly improve the cracking load, ultimate load, and energy absorption capacity of RCSS. There is a good agreement between computer simulations and experimental results, suggesting that the model of nonlinear inelastic analysis can be used with confidence to conduct further parametric studies.


Reinforced concrete stair slabs
Near surface mounted
Steel plates
Strengthening techniques
Finite element modeling

Data availability

Data will be made available on request.

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