Calculation of loaded structures strengthened by ways of increase in section and change of the calculation scheme
This article describes a variational method of calculating loaded constructions strengthened by ways of increase in section and change of the calculation scheme. We study the impact of the introduction of new or removal of some existing structural elements that change the calculation scheme of the strengthened structure, and the impact of sequencing of the steps in the strengthening process on the stress-strain state of the strengthened beam systems with elastic-plastic deformations. In determining the stress-strain state of the strengthened loaded beam system calculations are performed in the following sequence: 1) the stress-strain state of the original beam system is calculated under repair loads; 2) the calculation scheme is changed based on the change in the cross-sectional dimensions of the strengthened beams and the introduction of additional structural elements (or the removal of some existing ones); 3) the strengthened structure is calculated under additional operating loads, taking into account the elastic-plastic deformations, changes in cross-sectional dimensions of the beams, the addition of new elements, the imposition of stress fields associated with the repair works. Using the developed method and the created computer program, we calculated the stressload state of Bldg. 26 of Innovative Technopark «Idea» (Kazan), which was strengthened in a stressed state of the frame elements.