Abstract
This study presents the structural behavior and punching shear strength of the concrete slab-column connections strengthened with carbon fiber reinforced polymer (CFRP) laminates. The variables considered for the twelve specimens included the compressive strength of the concrete, the ratio of the tensile steel reinforcement, and the amount of the CFRP laminates. Square concrete slabs were simply supported along four edges. During the test, monotonically concentrated load was applied to the stub column located at the center of the slab. The punching shear strength, stiffness, and mode of failure were investigated. Test results demonstrated that increasing the compressive strength of concrete, ratio of the steel reinforcement, and amount of the CFRP laminates led to an increase in the punching shear strength of the slabs. Moreover, the CFRP laminates were effective in appreciably increasing the punching shear strength of the slab-column connections. An analytical approach was conducted to calculate the punching shear strength of the slab-column connections strengthened with CFRP laminates. Based on the theory of reinforced concrete members, the application of the CFRP laminates increased the flexural strength of the slab and resulted in an increase of the effective depth of the slab section. Consequently, the punching shear strength was increased. The results of the analytical calculation revealed that the analytical work accurately predicted the experimental punching shear strength.
Highlights
The use of fiber reinforced polymer (FRP) to strengthen concrete structural members has greatly increased in recent decades [1,2]
Experimental and analytical studies on reinforced concrete slab-column connections strengthened with carbon fiber reinforced polymer (CFRP) laminates were presented
The test results demonstrated that the punching shear strength of concrete slab-column connections was considerably increased using externally bonded CFRP laminates
Summary
The use of fiber reinforced polymer (FRP) to strengthen concrete structural members has greatly increased in recent decades [1,2]. FRP connections strengthened with glass fiber reinforced polymer (GFRP) laminates GFRP increased the punching shear capacity of the slab-column glass fiber reinforced polymer (GFRP). Their test results demonstrated that effectively connections, especially for the slabs with low compressive strength of concrete and reinforcement increased punching shear capacity of the underestimated slab-column connections, especially for the with ratio. [9]the studied the application increase the shear capacity of the slab and might change the failure mode from shear to shear-flexural of non-prestressed and prestressed carbon fiber reinforced polymer (CFRP) plates on concrete or flexural. The effect of CFRP laminates bonded to the slabs is explored in terms of the mode of failure, load-deflection characteristics, punching shear strength, and stiffness
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