Behaviors of Reinforced Concrete Slab Voided by Circular Paper Tubes
Mamush Teklie,
Tesfaye Alemu,
Beka Benti
Issue:
Volume 5, Issue 4, December 2020
Pages:
45-56
Received:
1 October 2020
Accepted:
2 November 2020
Published:
11 December 2020
Abstract: Voided slab construction is a way of effectively removing concrete from middle section of a RC slab which has not a structural function, thereby reducing structural dead weight. Voided slab construction has advantages such as reducing self-weight, Cost efficiencies and fast Construction. However, floor stiffness of voided RC slab is less than its solid counterpart and there is gap in literature about structural behaviors of voided RC slabs. This research work presents experimental and numerical investigations of voided RC slab. Six solid and voided RC slab specimens of size 800mmx300mmx200mm were casted and tested until failure under one-point load. Also, leveraging advantages of FEA, effect of influential variables such as void size, loading type, concrete compressive strength, and effect of top reinforcement were thoroughly studied. Experimental test results indicated as compared to control solid RC slab, 60mm diameter paper tube voided RC slab exhibited 12%, 15.54%, 25.50%, 14.64% and 6.71% loss in strength, cracking load, stiffness, ductility, and toughness respectively where as for 90mm diameter paper tube voided RC slab respective values were 20%, 19.87%, 38.80%, 25.50% and 12%. Also, as void size increased from 60mm to 90mm, voided slab failure mode changed from flexural to shear. Finally, FEA, ACI 318M-19 and EC2 codes showed good agreement with experimental results.
Abstract: Voided slab construction is a way of effectively removing concrete from middle section of a RC slab which has not a structural function, thereby reducing structural dead weight. Voided slab construction has advantages such as reducing self-weight, Cost efficiencies and fast Construction. However, floor stiffness of voided RC slab is less than its s...
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