Determination of screw anchor capacity in ultra-thin steel fiber reinforced self-stressing concrete (SFRSSC) flat slabs
2020
Locmanis, J., PRIMEKSS, SIA, Riga (Latvia) | Cepuritis, R., Norwegian Univ. of Science and Technology, Trondheim (Norway) | Pease, B.J., PRIMEKSS, SIA, Riga (Latvia)
Industrial concrete warehouse slabs constructed with steel fibre reinforced self-stressing concrete (SFRSSC),with a moderate to high content ( ≥ 30 kg•mE−3) of steel fibre reinforcement and expansive cementitious additives, can provide equivalent load bearing capacity as traditional reinforced or unreinforced concrete slabs with a reduced slab thickness. The reduction in slab thickness is possible due to improved flexural capacity of SRFSSC together with a reduced propensity for cracking and curling, common issues in traditional concrete slabs, caused by shrinkage. By reducing the slab thickness, the allowable length of mechanical anchors, commonly embedded in concrete slabs to restrain the racking system, is impacted. Anchors, and accompanying design aids and guidance provided by anchor manufacturers, available in the market are generally produced with traditional concrete slabs with higher thickness in mind. There is generally a lack of guidance and design aids for applications with thinner slabs constructed with SFRSSC. This paper presents data from over 250 pull-out test results of screw-type anchors extracted from SFRSSC slab specimen. The test series varies parameters from both the screws (diameter and length) and the SFRSSC slabs (slab thickness, fibre type/content, and concrete compressive strength). Testing was completed in accordance with relevant European Assessment Documents and results conclude combinations of anchor type and slab details (thickness, fibre type/content, and concrete compressive strength), where equivalent or improved tensile capacity is achieved for screw anchors embedded in SFRSSC.
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