USE OF IMAGING IN THE FORECASTS OF COMPOSITE COLUMNS DAMAGE WITH STIFF REINFORCEMENT
This work is devoted to modeling and visualization of the deformation and fracture design process of reinforced concrete columns with a rigid fixture. Studies allow directly see the distribution of stresses and strains on the surface and inside the column, zone visualize the appearance and propagation of cracks using various calculation models. It is necessary for the verification of the results of calculations with field experiments. Columns of the lower floors of multi-storey high-rise buildings perceive significant load of 10,000 tons or more. These loads are not only compression columns, but bending caused by accidental eccentricities. To reinforce columns it is advisable to apply a rigid reinforcement along with a flexible fitting. Traditionally joint work of reinforcement and concrete in construction is provided by the corrugations on the surface of the flexible fittings. On a rigid fixture there is no such corrugation, therefore a study of the joint work of the reinforcement and concrete is required. In this paper a number of computational models is illustrated by the use of visualization tools to analyze the process of deformation and fracture of column design: 1 - column model, which takes into account only the rigid reinforcement and concrete with linear properties of both materials; 2 - the same model, but with the nonlinear properties of concrete (the possibility of cracking and crashing); 3 - the same model, but with the non-linear properties of the concrete and the contact interaction of "metal - concrete"; 4 - the nonlinear model of the column including the more flexible fitting except a tight one. The effect on the bearing capacity of the structure of all components (rigid and flexible reinforcement), the nonlinear properties of materials, taking into account contact interaction of elements is shown. The discrepancy between the results of numerical simulation and the possibility of simplifying the calculation model is given.