Serviceability Limit State Design of SFRC Members

摘要

A significant body of research is available on the strength of steel fibre reinforced concrete (SFRC) members subjected to shear and flexure. The behaviour of SFRC under service loads has received less research attention. As the fibres are capable of transmitting tensile stress across a crack, the average tensile strain at a crack in a reinforced concrete member containing fibres is less than that in a similar member without fibres. As a result, the cracking and deformation characteristics of reinforced concrete structures can be significantly improved by adding fibres to the concrete mix. This paper first describes a physically rationale model of the tension stiffening behaviour of SFRC. With this behaviour quantified, expressions suitable for the design of SFRC members are derived for the control of instantaneous deflections and crack widths. Finally, a short example is provided.