Structural Engineering and Mechanics

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Modified models predicting punching capacity of edge column-slab joints considering different codes

  • Hamdy A. Elgohary (Civil Engineering Department, College of Engineering and Architecture, Umm Al-Qura University) ;
  • Mohamed A. El Zareef (Civil Engineering Department, College of Engineering and Architecture, Umm Al-Qura University)
  • Received : 2022.05.16
  • Accepted : 2024.02.05
  • Published : 2024.02.25
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Abstract

Significant changes have been made to estimate the punching shear capacity for edge column-slab joints in the latest editions of most current codes. The revised equations account for axial forces as well as moments conveyed to columns from slabs, which have a substantial impact on the punching resistance of such joints. Many key design parameters, such as reinforcement-ratio, concrete strength, size-effect, and critical-section perimeter, were treated differently or even ignored in various code provisions. Consequently, wide ranges of predicted punching shear strength were detected by applying different code formulas. Therefore, it is essential to assess the various current Codes' design-equations. Because of the similarity in estimated outcomes, only the ACI, EC, and SNiP are used in this study to cover a wide range of estimation ranges from highly conservative to unconservative. This paper is devoted to analyzing the techniques in these code provisions, comparing the estimated punching resistance with available experimental data, and finally developing efficient models predicting the punching capacity of edge column-slab connections. 63 samples from past investigations were chosen for validation. To appropriately predict the punching shear, newly updated equations for ACI and SNiP are provided based on nonlinear regression analysis. The proposed equations'results match the experimental data quite well.

Keywords

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