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CFRP Strengthening for Punching Shear of Interior Slab–Column Connections |
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| Authors: | Mohamed H Sharaf Khaled A Soudki Michael Van Dusen |
| Affiliation: | 1Research Assistant, Dept. of Civil Engineering, Univ. of Waterloo, Ontario, Canada N2L 3G1. 2Canada Research Chair Professor, Dept. of Civil Engineering, Univ. of Waterloo, Ontario, Canada N2L 3G1 (corresponding author). E-mail: soudki@uwaterloo.ca 3Vice President, Halsall Associates Limited, Toronto, Ontario, Canada M4P 1E4. |
| Abstract: | This paper presents the results of an experimental investigation studying the effect of retrofitting interior slab–column connections against punching shear failure with externally bonded carbon fiber reinforced polymer (CFRP) strips. Six full-scale, 2000?mm-square×150-mm-thick slab specimens were constructed. The effect of varying the CFRP strengthening amount and configuration on the load-carrying capacity of the slab specimens was investigated. Specimens were supported along their edges and tested to failure. Strengthened slabs showed an increase in stiffness between 29 and 60% and in punching capacity between 6 and 16% with respect to the control unstrengthened slab. An analytical model was refined to predict the punching shear capacity of the specimens strengthened with CFRP strips. The model takes into account both the configuration and amount of CFRP strips. The proposed model shows good agreement with the experimental results. |
| Keywords: | Concrete slabs Concrete reinforced Fiber reinforced polymers Reinforcement Shear |