VERIFICATION OF CORE AND SOLID-STATE MODELS OF THE SCAD COMPUTING COMPLEX FOR THE CALCULATION OF REINFORCED-CONCRETE WAFFLE SLAB FLOOR SYSTEM

In accordance with modern requirements for the design of buildings, designers are needed to use structural solutions that are resistant to progressive collapse. A space-working caisson-type overlap is one of such solutions. Spatial constructions are repeatedly statically indeterminate systems and their calculation is performed on a computer in software complexes based on the finite element method. A ribbed model can be created from various types of finite elements and get data that varies. One of the ways to control the finite element method is to calculate structures using different models. The purpose of the work is to search for the simplest and most accurate finite element model for calculating a ribbed reinforced concrete waffle slabs. The work is a continuation of verification studies of SCAD models for calculating reinforced concrete waffle slabs with a size of 9.0 x 11.55 m. The bending moments in the beams obtained by the analytical method using a rod model and a model created from three-dimensional elements are compared. The values of bending moments calculated analytically and using a solid-state model have similar values. The maximum deviations of the FEM from the analytical method of calculation are from -0.9 to +11.6%. The values of bending moments calculated using a solid-state model and a rod model have similar values. The maximum deviations range from -9.7 to +6.3%. The finite element model, the calculation of which is based on solving the volumetric problem of elasticity theory, is effective, but time-consuming to create and difficult to analyze the data obtained.