The production inaccuracies’ influence of square profiles on the strength of the contact joint of columns
https://doi.org/10.22227/1997-0935.2026.1.54-66
Abstract
Introduction. The production inaccuracies’ influence of steel bent closed welded square profiles with a size of 200 × 8 mm on the strength of the mounting contact joint of columns in height is considered. It is assumed that the permissible deviations in the size of the rolled steel produced are accepted in the standards, taking into account the provision of a given level of reliability equal to 95.44 %.
Materials and methods. The distribution laws for such random variables as sheet thickness t, profile height h and radius of the outer rounding R are investigated. To account for the production inaccuracies of the elements when determining the bearing capacity of a node under central compression, it is proposed to introduce a reducing coefficient of operating conditions γd, calculated as the ratio of the threshold value of the contact area Aʹcont to the standard cross-sectional area of the column profile An.
Results. Depending on the values of t, h, and R for the lower and upper columns, their cross-sectional areas (A1 and A2) are formed, as well as their contact area Acont, provided that the production inaccuracies are symmetrical and the columns are installed coaxially during installation. The program has been written in Python to generate possible values of the contact area Aʹcont, select an approximating function and calculate the coefficient of operating conditions γd.
Conclusions. As a result of research using the Monte Carlo method, it was found that, taking into account the influence of the production inaccuracies for sheet thickness t, profile height h, and outer rounding radius R, the strength of the column contact joint under central compression can decrease to 84 % of the calculated strength based on the cross-sectional area specified in the grade.
About the Authors
A. R. Tusnin
Moscow State University of Civil Engineering (National Research University) (MGSU)
Russian Federation
Russian Federation
Aleksandr R. Tusnin — Doctor of Technical Sciences, Professor, Head of the Department of Metal and Timber Structures, Director of the Institute of Industrial and Civil Engineering
26 Yaroslavskoe shosse, Moscow, 129337
RSCI AuthorID: 455914; Scopus: 6507367654, ResearcherID: U-2546-2018
I. V. Mylnikov
Moscow State University of Civil Engineering (National Research University) (MGSU)
Russian Federation
Russian Federation
Ivan V. Mylnikov — postgraduate student of the Department of Metal and Timber Structures
26 Yaroslavskoe shosse, Moscow, 129337
RSCI AuthorID: 1234163
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For citations:
Tusnin A.R., Mylnikov I.V. The production inaccuracies’ influence of square profiles on the strength of the contact joint of columns. Vestnik MGSU. 2026;21(1):54-66. (In Russ.) https://doi.org/10.22227/1997-0935.2026.1.54-66
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