DESIGNING AND DETAILING OF BUILDING SYSTEMS. MECHANICS IN CIVIL ENGINEERING

WELDING STRESSES IN DOUBLE-TEE BARS OF BUILT-UP CROSS SECTION WITH ELEMENTS OF LARGE THICKNESS

Vestnik MGSU 2/2017 Volume 12
  • Vershinin Vladimir Petrovich - Moscow State University of Civil Engineering (National Research University) (MGSU) Associate Professor, Department of Metallic Structures, Moscow State University of Civil Engineering (National Research University) (MGSU), 26 Yaroslavskoe shosse, Moscow, 129337, Russian Federation.

Pages 150-156

Procedure of calculation of temporary and residual stresses in welding of double-tee bars with elements of large thickness, i.e. at an uneven distribution of welding stresses as per a thickness of flanges, is set forth. This procedure is based on analytical solution of the temperature problem. Solution of the problem on determination of fields of temporary and residual stresses amounts to determination of temperature and stress-strain state (SSS) in the flange and in the wall as separately existing systems, and then to a solution of the problem of compatibility of deformations in the line of conjugation thereof. Factors making the most influence on the intensity of residual welding stresses (RWS) in the flanges of double-tees, are noted. The intensity of RWS is most significantly influenced by the chord thickness variation tf , strength of steel σт, and heat input of welding. The flange width variation bf influences the distribution of RWS to a lesser degree. Components of RWS have a complex pattern of distribution in the direction of thickness. Longitudinal component of RWS reaches a considerable value (yield strength of material). Value of thickness and transverse components of RWS with thickness of flanges of double-tees not more than 40 mm, and with respective minimal weld legs turns out to be insignificant. Growth of the yield strength of steel (as applied to low-carbon and low-alloy steels) leads to increase of level of RWS. Increase of thickness of the flange leads to a growth of unevenness of distribution of RWS in thickness and to increase of the thickness component of RWS. Welding heat input enhancement results in a more uniform heating of the flange in thickness and, therefore, a more uniform distribution of residual stresses in the flange thickness, hereat the stressed state in the flanges of double-tees comes close to uniaxial.

DOI: 10.22227/1997-0935.2017.2.150-156

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