BEHAVIOUR AND LOAD BEARING CAPACITY OF COMPOSITE SLAB ENHANCED WITH SHEAR SCREWS
DOI:
https://doi.org/10.11113/mjce.v20.15771Keywords:
Composite slab, horizontal shear bond, partial shear, bending test, shear screwAbstract
Horizontal shear interaction between profiled steel sheeting and concrete in composite
slab is obtained through various means, such as frictional resistance due to indentation or
embossment in the sheeting, interlocking at the steel and concrete interface resulting from
curvature and shape of the sheeting profile under bending, and anchorage devices such as welded shear studs and crippled sheeting at the end of the span. Permanent end pour stops may provide some restraining effect to the slipping of the concrete, and hence may enhance the composite action. Despite the use of many types of devices, most reported test results of typical length composite slabs still exhibit partial shear interaction. This paper reports the enhancement of the horizontal shear interaction at the concrete-profiled steel sheeting interface of composite slab by using shear screws. Six full scale bending tests were conducted of which three specimens with different slenderness were enhanced with self drilling screws while another three were without screws. The test results show that the failure mode of composite slab can be improved to ductile type and the load carrying capacity can be increased by the presence of the shear screws. The load performance of the slab is also affected by the slenderness, which is the ratio of shear span to effective depth.
References
Abdullah, R. and Easterling, W. S. (2007). “A new small scale testing method for composite slabs,†Journal of Structural Engineering, ASCE, 133(9), 1268-1277
British Standards Institution (2002). Testing hardened concrete – Part 3: Compressive Strength of Test Specimens. BSI, London, BS EN 12390-3:2002.
de Andrade, S. A. L., da S. Vellasco, P. C. G., da Silva, J. G. S., and Takey T. H. (2004). Standardized Composite Slab Systems for Building Constructions. Journal of
Constructional Steel Research, 60 (3-5), 493-524.
Eurocode 4 (2004). Design of Composite Steel and Concrete Structures. Part 1.1.: General Rules and Rules for Buildings. BSI, London, BS EN 1994-1-1.
Johnson, R. P. (1994). Composite Structures of Steel and Concrete, Vol 1: Beams, Slabs,
Columns, and Frames for Building. Blackwell Scientific Publication, Oxford.
Schuster, R. M. (1973). Composite Steel-Deck Reinforced Concrete Systems Failing in Shear-Bond. 9th Congress - International Association for Bridge and Structural
Engineering, Amsterdam, Holland.
Veljkovic, M. (1996). "Behaviour and Resistance of Composite Slabs," Phd Thesis, Lulea University of Technology, Lulea, Sweden.
