NONLINEAR FINITE ELEMENT ANALYSIS OF WAFFLE COMPOSITE SLAB STRUCTURE SYSTEM CONTAINING STEEL FIBER

Steel fiber concrete waffle composite slab system includes material composite and structure typecomposite, which has good mechanical and thermal insulation properties. Nonlinear finite element analysis for themechanical properties of the whole process on the composite structure system was presented, and by changing thefiber content the parameter were discussed. The functions of steel fibers were considered mainly through modificationof the constitutive relationship of concrete and elastic modulus and other parameters, without consideration of the bondand slip between steel fiber and concrete in the finite element analysis model to simplify calculation. The analysis results showed that the structural deformation and crack resistance could be improved significantly even adding less steel fiber in concrete. The stress of different positions in different steel fiber content were basically the same before the formation of upper plastic hinge line, but after the formation of plastic hinges line, the influence of steel fiber content on stress distribution was larger because of the influence of redistribution of internal forces. In addition, the steel fiber volume fraction on the developing and distribution of the cracks had little effect. Because steel fiber can increase the tensile strength of concrete, which had a certain impact on the distribution of structural cracks.