Experimental Study and Numerical Modelling for Flexural Capacity of FRC Structural Elements

Abstract

Concrete reinforced by short steel fibres is typical brittle matrix composite, in which fibres are impeding cracks growth, such way increasing material’s tensile strength. The use of steel fibre reinforced concrete (SFRC) in structures with high physical and mechanical characteristics makes possible to reduce their weight and cost, to simplify their production technology, to reduce or eliminate reinforcement labour, at the same time increasing reliability and durability. Randomly distributed discontinuous fibres are bridging the crack’s flanks providing material’s “ductility”- like non-linear behaviour at cracking stage. The current study is focused on one formulation of a specific type of concrete matrix with added fibres and without fibres. Concrete cubes and prisms without fibres and having in every situation the same content of 60 mm long fibres were fabricated. Cubes (100×100×100 mm) were tested in compression and beams (100×100×400 mm prisms) were tested under four-point bending (4PBT). Fracture process (crack growth) in the material was modelled, based on experimental results (part of experimental data was used). Finite element method (FEM) using the ANSYS program analysis were realized modelling stress distributions in the broken beams with the goal to predict fracture process. Model’s prediction was validated.

Experimental Investigation and Modelling of the Layered Concrete with Different Concentration of Short Fibers in the Layers

“…The structural model of the opening of the macro-cracks in the prisms was developed using the previous modelling experience [45,46] and the results of testing of the micromechanics of the fiber pulling obtained in this study. The mechanical behavior of SFRC depends on the amount, orientation and the spatial distribution of the fibers, and geometry of the particular fiber, as well as design of the concrete matrix mix and the way concrete mix is placed into the formwork [47][48][49][50][51][52]. Fiber concentrations in the specimens and every particular layer of the specimen are given in Table 3.…”

Testing the Physical and Mechanical Properties of Polyacrylonitrile Nanofibers Reinforced with Succinite and Silicon Dioxide Nanoparticles

“…In the past, one of the main engineering challenges was the development, introduction, and mass production of efficient materials in all industrial areas. Different fiberreinforcement options are used in various fields [1][2][3][4][5], including the use of various materials and technologies [6][7][8][9]. Due to its superior physical characteristics, such as low density, thermal constancy, high strength, and modulus of elasticity, polyacrylonitrile (PAN) is a commercially important semicrystalline polymer [10,11].…”

Optimal Sensor Placement in Composite Circular Cylindrical Shells for Structural Health Monitoring

“…3D Finite element model (FEM) of a closed composite cylinder was built using ANSYS16.0 software that widespread use for structural analysis of engineering structures [30,31]. The four-node and eight-node structural shell elements SHELL181 and SOLID185 were chosen to model the composite cylinder shell and the plywood flanges and the plywood plate, respectively.…”