EXPERIENCE IN THE OPERATION OF LARGE-SPAN LAMINATED TIMBER STRUCTURES WITH TSNIISK SYSTEM NODES

Serial production of glued wooden structures (GWS) in Russia was organized in 1975. The structural system “TSNIISK” was created and improved since 1975. The feature of the system is the use of prefabricated GWS joints on glued rods in nodes and joints. They were applied in hundreds of large-span buildings: water parks, playpens, fertilizer terminals, sports facilities, which were designed in the Loadbearing wood structures of laboratory of TSNIISK named after V. A. Koucherenko. According to Federal Law FL No. 384 of 12/30/2009, the structures of these buildings are subject to field surveys and monitoring. The article presents systematized conclusions about the state of GWS based on the results of their examination. Characteristic defects of the GWS are delaminations along the adhesive seams and cracks along the wood. The main causes of delamination are operating conditions with low relative humidity, violations of bonding technology and design errors. The analysis of the state of the GWS allowed to form recommendations for safe operation and suggestions to the design standards.