Cherednikova O. Stress-strain state of the light concrete composite slab with profiled steel sheeting

Object - bending behavior of light concrete composite slabs with profiled steel sheeting (LCCSPSS) under short-term load; aim - an analysis of the stress-strain state (SSS) of light concrete composite slabs with profiled steel sheeting taking into account shear deformations; methods - experimental methods of study of the stress-strain state and bearing capacity for testing LCCSPSSs; numerical methods (Finite Element Method (FEM)) for simulating of the stress-strain state of LCCSPSSs; methods of mechanics of a deformed solid (mathematical shear model) for the study of the SSS of the bending non-uniform in the section slab elements, which take into account the cross sections warping, caused by deformations of the transverse shear; novelty - the mathematical shear model of the stress-strain state under bending of the inhomogeneous cross sections of slab elements, which takes into account the warping of the cross sections of LCCSPSSs due to transverse shear deformations, was improved; new types of anchors for the combined action of profiled steel sheeting with light concrete were proposed; new experimental data on the behavior and stress-strain state under the short-time load of elements of LCCSPSSs were obtained, which confirm the increase of slab strength and decrease of slab deformability due to the combined action of components of the composite slabs: profiled steel sheeting, light insulation concrete (polystyrene concrete); for the first time, the possibility of using a insulation layer (polystyrene concrete) as a constructive element for the composite roofing and floor slabs, taking into account the permissible shear of complex section components, was theoretically and experimentally proved; the method of simulation of the stress-strain state of LCCSPSSs by the finite element method was further developed; results - the results obtained during the tests give the possibility of using the most effective anchor compounds of polystyrene concrete with profiled steel sheeting in LCCSPSSs; an adapted version of the mathematical shear model for calculating LCCSPSSs, which taking into account shear deformations, was developed; the method of numerical simulation of the SSS of LCCSPSSs using the finite element method, which correctly takes into account the combined action of components of the complex cross section, was developed; on the basis of comparison of calculation methods of LCCSPSSs, practical recommendations for their application were provided; field - construction