In the present thesis, a dynamic structural analysis of a D-type buckle-type crane with load capacities 5, 10, 15, 20, 25 and 30 tons and 10, 15, 20, 25 and 30 meter lights, With the aim of improving operating conditions. A survey was conducted to collect input data, which are the conditions where the main beam will operate. Four stages of analysis were performed: the former being the shape design; The second the main loads and influencing factors; The third the efforts, safety factors and deformations; And the fourth stage for dynamic beam response. Through the dynamic structural analysis and use of stiffeners in drawer beam for different lights and load states; It was possible to improve indicators such as: rigidity and weight of the birráil crane bridge. The analytical rigidity index is 30 for a beam of 10 meters’ light with a load of 30 Ton and decreasing to a value of 5.6 for the...