Evaluation of ACI code equation on punching shear strength of slab-column connections strengthened with FRP: A database study

Ali Cem Yagar, Shahram Derogar, Ceren Ince, Richard James Ball

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Abstract

Even though fibre reinforced polymers (FRP) have been competently utilised to enhance the punching shear capacity of flat slab-column connections over the last few decades, a unified formula addressing the influence of FRP strengthening on the performance of such connections is deficient. This study evaluates the ACI 318–19 code equation precision and the associated modifications when applied to predict the punching shear strength of flat slab-column connections with externally bonded FRP strengthening using the qualified database harvested from the literature published between 1995 to 2023. Here we present a new formula, predicting the punching shear strength of flat slabs, derived using the comprehensive database through the non-linear regression analysis. The proposed model captured all the trends observed for the influencing parameters and compared these to the ACI 318–19 code equation and its associated modifications. Predicting the punching shear strength of flat slab-column connections with improved precision does not only increase the practicality and cost effectiveness during the design phase, but also reduces the carbon footprint and introduces the concept of regenerative design in structural engineering practice.
Original languageEnglish
Article number117965
JournalEngineering Structures
Volume308
Early online date6 Apr 2024
DOIs
Publication statusE-pub ahead of print - 6 Apr 2024

Keywords

  • Punching shear strength
  • ACI code equation
  • FRP strengthening
  • Slab-column connections
  • Proposed model

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