Abstract
The present experimental work investigates the applicability and performance of a new strengthening method for concrete slabs, intended to increase their punching resistance using combination layers of steel wire mesh with epoxy attached to the concrete slabs’ tension face. Six simply supported square reinforced concrete slab specimens were tested up to failure under a central concentrated load. The main parameters in the study are the concrete compressive strength (30 MPa and 65 MPa) and the configuration of a bundle externally fixed to the tension side of the tested slabs. The experimental results appeared to greatly enhance the performance of the specimens, as they were externally strengthenined under this new method. When compared to the control slabs, the punching load and stiffness of the strengthened slabs increased up to 28% and 21%, respectively.
Highlights
Flat slabs are one of the more common types of slabs used in concrete construction, such as office buildings, warehouses, and car parks
Flexure failure occurs when the amount of steel reinforcements located at the tension side of the flat slab are relatively little and the yielding of the reinforcement governs the strength of the specimen [1]
The punching shear failure is characterized by the main steel reinforcement does not reach the yielding strain when the concrete is in the vicinity of the column, as it reaches the crushing stage [2,3]
Summary
Flat slabs are one of the more common types of slabs used in concrete construction, such as office buildings, warehouses, and car parks. The punching shear failure is characterized by the main steel reinforcement does not reach the yielding strain when the concrete is in the vicinity of the column, as it reaches the crushing stage [2,3]. It takes place suddenly, without any warning and with small displacement, resulting in a brittle mode failure. Punching shear failure has a critical impact on structural engineering systems and should be avoided
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