Design Parameters of Double Layers Steel Fiber Concrete Beams

Abstract

In the calculation and design of multi-layer steel fiber concrete beams will depend on different design parameters and will affect the stress-strain state, displacement in the beams. With multi-layer beams subjected to concentrated loads, the lower region of beam will be tensile, while the upper region will be compressed (at the middle of the beam span), leading to cracks in the tensile zone formed earlier than other regions of the beam. In addition, the changes in design parameters such as steel fiber content in concrete, shear steel spacing at the ends of the beam, number of tensile steel bars, diameter of tensile steel bars, thickness of steel fiber concrete layer, considering the nonlinear element of the materials etc. will also affect to bearing capacity and crack development in beams. In the experimental method, to survey many design parameters, it is necessary to manufacture and test beam samples, so it takes a lot of time, effort and money. Therefore, in this paper, the authors used the ANSYS numerical simulation method to simulate the formation of cracks, the development of cracks as the load increases, thereby constructing the load and stress relationship diagram, load and vertical displacement relationship diagram in double-layer steel fiber concrete beams, with steel fiber concrete layer below the normal concrete layer when the design parameters are changed.KeywordsFiber contentStress-strainCrackMaterial nonlinearShearDouble layers beam