Principles and criteria for the development of rational structural design of non-type geometry beam pavements

Girder systems, despite their simplicity, are the most common types of structural systems. The design starts with the layout, as a result of which the layout of the ledgers (main and ordinary), the type of coupling (hinged or rigid) and the main criterion for assigning the pitch of ordinary ledgers are selected. Design justification of the assigned layout structural scheme and selection of the most rational solution allows to reduce costs at the stages of the life cycle of the building such as construction, operation, reconstruction or modernization. The accumulated and analyzed volume of the types of applied operational structural solutions of civil building coverings, multiple data on the nature of the development and realization of damage in structures of this type, allows us to formulate the purpose of the study, which consists in the computational justification of the proposed principles and criteria for the development of rational structural scheme of beam coverings. In order to realize this goal, numerical studies have been carried out, considering the variation of the most significant parameters, the change of which affects the result of the search for rational structural schemes of beam covers. According to the results of systematization of the data of the performed work, the algorithm of creation of rational structural solution of beam coverings of non-type geometry is proposed. The algorithm is tested in finding a rational solution of the roofing of an operating building of non-typical shape with plan dimensions 60.0 × 36.0 m.