The goal of the work is to study the nature of the behavour and determine the bearing capacity (determination of the coefficient of working conditions) of fragments of wall structures made of heat-insulating non-autoclaved monolithic foam concrete with a density of 200 kg/m3, profiled steel and fiber-cement sheets. The object of research is lightweight steel concrete structures (LGSS).The subject of research is the bearing capacity of LSCS under the action of a vertical distributed load, applied to the "bearing" part of the wall panel. The researsh method of the condition load effect factor of LSCS is based on experimental testing LSCS for one sample; carrying out a verification calculation according to the method chosen in such a way that the results of the experiment correlate with the numerical or analytical result; further carrying out a numerical experiment for a model that is completely identical to the tested LSCS sample, but without foam concrete filling (i.e. LGSS). Results. It was shown that when comparing the experimentally obtained data on the loading capacity of the LSCS wall panel and numerical calculations of the stress-strain state of the corresponding LGSS wall panel, the displacements of the LGSS are up to 2 times greater than the displacements of the LSCS, and the stresses differ from 2 to 13 times. It is proposed when using a numerically experimental method for determining the condition load effect factor of profiled steel in LSCS to perform engineering calculations of LSC-wall panels using foam concrete with density 200 kg/m3, by analogy with the calculation of light steel-concrete slabs, it is advisable to take a factor 1.25 or carry out a full series tests.