The main causes of accidents of space lattice Kislovodsk-type structures

Abstract

The article deals with the operation problems of space lattice constructions (SLC) of the Kislovodsk-type, revealed as the results of a survey of more than ten structures within the period from 2000 to 2020. The main causes of accidents of the SLC system was revealed and presented. The disadvantages of production mounting of the Kislovodsk-type system with a hidden capital are considered; the recommendations for preventing the displacement of the SLC support connectors of the Kislovodsk-type system with a hidden capital are presented. As an example, the collapse causes of the Kislovodsk structure made with a hidden capital according to a rare scheme operated in Syktyvkar were analysed in the work. The results of numerical study of the load-bearing capacity of constructions made in CAD SCAD 21.1.1.1 were presented. The most common structural defect of this type – the elements overload of the SLC system is considered in this work. The calculation showed that the structural plate has a three times overload of 35% of the elements (compressive stability, strength). The overload is connected with the normative load increase of snow cover in 2003 and in 2016, and the weighting of the roof structure (twice as compared to the production solution) during its repair work. The load calculation was based on the survey of the SLC constructions. Based on analysis of constructions of this type, the authors give the recommendations on the list of works required for additional inclusion in the survey program of the technical condition of constructions.