Umlagerungsverhalten von Plattentragwerken aus Stahlfaserbeton

Redistribution Effects of Steel Fibre Reinforced Concrete Slabs Numerical Computation and Design

The bearing behaviour of steel fibre reinforced concrete (SFRC) slabs is mainly affected by nonlinearity due to cracking and redistribution effects leading to an increased bearing capacity. A nonlinear approach for structural analysis and design of such structures is presented. It is based on an elasto-plastic damage theory to model material behaviour of SFRC and allows for additional embedded rebars. By adopting a finite element discretisation of the slab structure a regulated smeared modelling of cracking is achieved. Further the nonlinear model is applied to a full scale test of a SFRC flat slab structure and results are compared to alternative already well established methods, namely a linear elastic analysis and the yield line theory. The proposed method is proven to be very suitable for design but - alike the alternatives - depends on assumed crack patterns, residual tensile strength of the SFRC and geometrical parameters.