DETERMINATION OF RESIDUAL STRESSED STATE IN BOX SECTION WELDING ELEMENTS
The production processes of steel structures are accompanied with the local heat building up and initiate residual stressed state. Metal is extended at heating up and «cold» metal, surrounding heating up area, prevents temperature deformation of separate areas. The local plastic strains and stressed states have resulted from such effects. The box section elements have ever widening applications as bearing ones. The use of box type constructions has been justified because they are of equal stability. The decline of bearing strength of the compressed weld fabricated I girders has been experimentally confirmed up to 37 %. Unfavorable effect of residual stressed states differentiates the coefficients of longitudinal bend for analysis of the compressed elements of one type. In the planning standards of steel structures, the design method to stability does not take into account the residual stressed state. Nowadays, there are design methods of I girders and T beams subjected to the axial compression with a plane bending of greater or less stiffness. At present, there are no design methods of elements of box type section of rigid work of material and with residual stressed state. The present paper is devoted to the solution of this problem.