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Abstract. This paper presents an analysis of semi-rigid effects of bolted joints occurring due to clearance holes and manufacturing tolerances at temporary fixing and the exploitation stages. The manufacturing requirements of SP 53-101-98 'Production and Quality Control of Steel Structures' and GOST 23118-2012 'Building Steel Structures. General Specifications' are used for calculations. Friction-grip joints with high-strength bolts are considered as well as joints with ordinary structural bolts. Different permissible assembling technologies are reviewed to account a non-linear behaviour of the joint at temporary fixing and during the operational stage. The recommendations were developed for the scheduling of mounting works which can provide convergence between the design of a whole building and the consequential calculations of mounting schemes. IntroductionThe last century saw the evolution of analysis methods of semi-rigid joints: the slope-deflection equation and moment distribution methods, to matrix stiffness methods, iterative methods. Studies agree that in frame analysis, joint rotational behaviour should be considered.In practice bolted joints are usually assumed either hinged or rigid. This simplification leads to an incorrect estimation of frames behaviour. In fact, the connections are between the two extreme assumptions and possess some rotational stiffness. Existed studies reveal, that accounting of semi-rigid behavior of joints is very important for different problems such as optimum design of steel structures [1-4], seismic-force resisting systems [5,6] and other applications.There are a lot of different models of semi-rigid joints [7][8][9][10][11] which describe behaviour of structure in operational stage, but semi-rigid effects of temporary fixing is beyond of this studies. Calculation scheme of frames is changing while construction process, hereby total stress-strain state is depends on stiffness's of joints and mounting sequence. Hence, semi-rigid behavior of joins in pre-exploitation stage should be considered.Modern building industry goes from standard unified solutions to individual projects. Monolithic reinforced concrete is widely used in buildings with metal frames, which leads to decreasing in the degree of industrialization of construction and installation works. The transfer of basic technological processes to the construction site negatively affects both the cost of construction and the quality of the works.

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