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Punching shear strengthening of flat slabs with CFRP on grooves (EBROG) and external rebars sticking in grooves

Authors
  • Azizi, Rojin1
  • Talaeitaba, Sayed Behzad1
  • 1 Azad Islamic University, Civil Department, Khomeinishahr Branch, Khomeinishahr, Isfahan, Po. Box 81475-119, Iran , Khomeinishahr (Iran)
Type
Published Article
Journal
International Journal of Advanced Structural Engineering
Publisher
Springer Berlin Heidelberg
Publication Date
Feb 18, 2019
Volume
11
Issue
1
Pages
79–95
Identifiers
DOI: 10.1007/s40091-019-0218-4
Source
Springer Nature
Keywords
License
Green

Abstract

The main objective of this study is strengthening of flat slabs in punching shear with a new model. For this purpose 15 numerical samples include a control and 14 strengthened defined and nonlinearly analyzed up to failure. The strengthening method is new method of grooving in two orthogonal direction (x and y axes of slab plan) and then mounting the external bars (sticking) in one direction and FRP in EBROG (externally bonded reinforcement on groove) method in another direction. The results showed the great efficiency of the method so that the punching shear capacity of strengthened samples increased between 28 and 62% compare to control one. Also the mode of failure changed in strengthened specimens from shear to flexure–shear and the punching critical area was broader and developed from the loading point. In the grooving method the sticking bars yielded in all specimens and the FRP tensile strain was closer to rupture strain compared to EBR.

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