An effective method for strengthening steel beams and purlins using an elastic support in the span

The article is devoted to the development of theoretical approaches to strengthening bending elements, such as beams and girders, through the installation of an elastic support at the midpoint of the span where the maximum bendingmoment occurs, as well as the development of a practical calculation method for such reinforcement. The need for strengthening may arise under various conditions, including prolonged operation beyond the design lifespan, increased service loads on existing structures, wear and tear of structures, or damage caused by episodic additional loads (e.g.,earthquakes, explosions). The purpose of the study is to provide a practical method for reinforcing girders and beams using an elastic support at the span to increase the load-bearing capacity of structures under increased loads (e.g., installation of solar power stations or other additional equipment on roofs) or in cases of damage caused by explosions or other episodic loads that reduce the cross-sectional geometric characteristics and require rapid strengthening. The article proposes a calculation methodology for this type of reinforcement that addresses shortcomings in existing scientific and technical literature and facilitates the broader implementation of the method to enhance the reliability of structures.The article presents an effective method for reinforcing girders and beams in response to increased loading. Using an elastic support (brace) at the span enhances the load-bearing capacity of structures.The method involves installing a brace under the element to be strengthened, secured with additional bolts to create an elastic support that reduces the applied load. This solution eliminates the need for welding or disrupting the structural integrity. Atechnological gap is provided to create pre-stressing, which is closed during bolt tightening. The main advantages include minimal intervention, pre-stressing creation, and increased structural reliability. The article contains a calculation methodology for this reinforcement method, promoting its practical application to improve the efficiency and reliability of structures.The proposed reinforcement method is demonstrated on steel structures but can be extended, if necessary, to structures made of other materials, such as wood or reinforced concrete.