SHEAR STRENGTH OF ONE-WAY RIBBED SLABS WITH STEEL FIBER CONCRETE

Abstract

The ribbed slabs are used both in small and large constructions, and its use is growing due to the advantages that this constructive system provides. However, considering the demeanor of these slabs without transverse reinforcements (stirrups), few studies were made in Brazil. This study brings an experimental analysis of 8 unidirectional ribbed slabs of reinforced concrete subjected to loads perpendicularly distributed to the ribs. 4 (four) reference slabs and 4 (four) reinforced slabs with steel fibers with a length of 1,700 mm and width ranging from 650 to 950 mm were tested, all with table thickness of 40 mm and ribs with cross section of (100 x 100) mm². The compressive strength of concrete was approximately of 30 MPa. The results were compared to those estimated by the design codes ACI 318 [1], EHE 08 [2], NBR 6118 [3] and MC10 [4]. It was verified that the increase in shear and bending strength of the reinforced slabs with fibers was substantial, what makes those slabs technically feasible.