Punching shear strength of ultra-high-performance fibre concrete slab–column connections
M. Shoukry, Ahmed M. Tarabia, Ahmed M. Yassin
Abstract
This paper presents a study on the punching shear strength and behaviour of ultra-high-performance fibre concrete interior slab–column connections. An experimental programme was performed on ten simply supported slabs subjected to an increasing concentrated load at the slabs’ centre. The main studied variables were concrete strength (56 and 123 N/mm 2 ), fibre content (0, 1, 2, and 3%), fibre shape (end-hooked or corrugated), fibre size with the same aspect ratio, fibre type and material (steel, polypropylene or fibreglass). The test results indicated the efficiency of using steel fibres in ultra-high-performance concrete slabs to enhance their punching shear strength. The test results were used to evaluate existing empirical equations estimating the punching shear strength of ultra-high-performance concrete slabs with fibres. The evaluation indicated that the equations proposed by the Association Française de Génie Civil (AFGC) in 2013, the fib Model Code for Concrete Structures 2010 and by Higashiyama and co-workers in 2011 provided the most accurate estimation when compared with test results.