THE BENDI NG CALCULATION OF A METAL FRAME BUILT OF RESISTANT MATERIALS WITH DIFFERENT SECTIONS

The subject proposed was developed based on a real situation. This paper aims at developing an evaluation method, the calculation of frame-strength steel structures, used in industrial and reinforcing possibilities of these structures. Organisms ability in the field, impose conditions for the design, construction and operation by national rules and international rules. While with the passing years, a new problem arose if all these constructions are safe to work. Requests to tensions, normal ranges while tangential ( ,  ), periodically between a lower limit and one upper varying loads are called. With these varying tensions, pieces break off and break at much lower tensions than in the case of static requests. The phenomenon of decreasing resistance characteristics under the effect of varying loads, is called (improperly) material fatigue (1). The reality is that tearing at a piece varying loads (construction) constitutes a process of occurrence and development of cracks, which decreases continuously active section of the piece. When the section is insufficient to activate the stress effectively, breakage occurs. The maximum value of the tension at which the rupture does not occur to varying loads is called fatigue resistance