Pryadko Y. Safety of large-span pivotal coatings with large cut formed by the system of rigid threads on elliptic setting.

The dissertation concerns the study of the stressed and strained state (SSS) and safety indices of a coating structure in the form of a depressed large-span suspension shell with a cut on elliptical setting formed by the system of curved and rigid threads of a through section. The dissertation introduction has justified priority, has formed scientific novelty, practical usefulness of the dissertation and has given the common characteristics of it. The first part deals with the technique of design conceptions and procedures of analysis of the stressed and strained state of coating shells with and without a cut of through section rigid threads and coating systems formed by the rigid threads. The contemporary principles providing safety at design of structures from rigid threads have been considered. The second part gives the research results of the stressed and strained state of the spatial block model of the coating with the cut formed by the rigid threads of through section to the action of design load combinations to study actual behaivour of the coating structure. The third part describes principal diagrams of a level safety design of the studied system to design stages. The fourth part describes design technique and design work formed on the determination of numerical indices of safety of the designed structure. The technique includes three design stages.