Sopilnyak A. Strength and cracking-resistance of three-layer reinforced concrete wall panels

The object of study self-bearing and hinged three-layer reinforced concrete containing wall panels of multistorey frame-panel buildings. The aim of the thesis is the improvement of the method of strength and crack resistance calculation and the structural arrangement of three-layer reinforced concrete containing wall panels. Methods: Methods of reinforced concrete theory, numerical modeling, methods of technical and economic evaluation of design decisions; Experimental investigations of hinged wall panels were made according to standard methods. Theoretical and practical results: method of structure strength and crack resistance calculation with the application of reinforced concrete physical model was improved by using model representations and the charts of material behavior; for the first time the results of strength and crack resistance calculation of reinforced concrete panels with a core of polystyrene concrete taking into account combined interaction between layers; experimental and theoretical data on stress-strain state regularities of three-layered reinforced concrete beams samples under the action of short-term load. Scientific novelty: the structure of three layer reinforced concrete panel with the formation of monolithic bond between layers; experimental data about strength and crack resistance of layer reinforced concrete elements with middle layer of polystyrene concrete considering joint work of layers during short-term loading (obtained for the first time); calculation method of structure strength and crack resistance using physical model of reinforced concrete, model representation and diagrams of material work is improved; technical and technical-economic parameters of protecting structures considering modern codes demands for energy efficiency. Degree of implementation: obtained results are used in design of shop building on Kirova 44-d str. "Medtehnika" and in design of protecting structures of cashing service building, pay desk and storage building of Novooleksandrivka regional counsil, Dnipropetrovs'k region. Scope of use: in the design organizations for implementation in the design of residential and housing objects.