Comparison of eurocode 2 and BS 8110 recommendations for the design of bending and deflection in simply supported one way slabs

Abstract

Recently in Sri Lanka, design of the civil structures is adopted by Eurocodes superseded by the British code of practices. For reinforced concrete structures the Eurocode 2 will became of paramount importance to the design of the structural members. Bending and deflections are most important governing criteria in designs of slabs. Both standards for reinforced concrete design to check the deflection control by mean of minimum member thickness requirement and a direct computation method. This research covers an analytical study that compared maximum span to depth ratios on deflection on different influence factors in simplified method and rigorous method. One-way slab on simply supported slab was considered to compare the parameter to compare in the research. Further the deflections were compared with an experimental result produce by Gilbert (2004) with numerical calculation with respect to both code recommendation and its reliability was discussed. The influence factors on deflection and bending were analyzed in term of sensitivity factors to understand the variation on results. The results indicated the EC2 predict less area requirement for the flexure and a very thin slab can be used to control deflection if the applied moment not induced any crack in the element and the increased in tensile strength and Elasticity of concrete provide more sophisticated deflection control compared to the BS 8110.