Two-way slabs: Experimental investigation of load redistributions in steel fibre reinforced concrete
Journal article, 2014

In the design of two-way reinforced concrete slabs, e.g. using the strip or yield line design method, the possibility of redistributing the load between different loading directions is used. The main aim of the present study was to investigate how fibres affect the structural behaviour such as the possibility for redistribution, crack patterns and load-carrying capacity. The investigation was conducted by means of experiments on two-way octagonal slabs, simply supported on four edges, centrically loaded with a point load. The slabs spanned 2.2 m in both directions and the reinforcement amount was twice as large in one direction as in the other, in order to provoke uneven load distribution. Three slabs of each reinforcement configuration were produced and tested: conventionally reinforced slabs, steel fibre reinforced slabs and a combination of both reinforcement types. The reaction force on each supported edge was measured on five rollers per edge. A moderate fibre content (35 kg/m3) of double hook-end steel fibres was used. The steel fibres affected the structural behaviour significantly by providing post-cracking ductility and by increasing the ultimate load-carrying capacity by approximately 20%. Most significant, the steel fibres influenced the load redistribution in such a way that more load could be transferred to supports in the weaker direction after cracking. Further, more evenly distributed support reactions were obtained in the slabs containing both reinforcement types compared to the case when only conventional reinforcement was used. The slabs reinforced by steel fibres alone did not experience any bending hardening; however, a considerable post-cracking ductility was observed. Furthermore, the work presented in this paper will provide results suitable for use in benchmarking numerical and analytical modelling methods for steel fibre reinforced concrete, as the experimental programme also included extensive testing of material properties.

Concrete slab

Steel fibre reinforced concrete

Load distribution

Experimental investigation

Author

David Fall

Chalmers, Civil and Environmental Engineering, Structural Engineering

Jiangpeng Shu

Chalmers, Civil and Environmental Engineering, Structural Engineering

Rasmus Rempling

Chalmers, Civil and Environmental Engineering, Structural Engineering

Karin Lundgren

Chalmers, Civil and Environmental Engineering, Structural Engineering

Kamyab Zandi

Chalmers, Civil and Environmental Engineering, Structural Engineering

Engineering Structures

0141-0296 (ISSN)

Vol. 80 61-74

Areas of Advance

Building Futures

Subject Categories

Civil Engineering

DOI

10.1016/j.engstruct.2014.08.033

More information

Created

10/7/2017