Project of a simply supoported steel road bridge with a span of 25m

摘要

The graduate thesis includes static analysis and design of simply supported steel beam road bridge. The design of profiles were made in accordance with applicable Eurocode standards with emphasis on standard SIST EN 1993, which deals with the design of steel structures. Due to high bending and shear loads classical hot-rolled sections were not suitable for design, therefore a welded thin walled girders were chosen. Such girders are usually composed of compact flanges and slender web. The result is a lightweight girder with low shear capacity, which is increased by the transverse stiffeners. In the initial part of the thesis the loads of longitudinal and transverse plated girder are defined. The steel structure is design to load self weight and the impact of traffic. The effect of wind and earthquake is not included in this thesis. The design of cross-sections, transverse stiffeners and the connection between longitudinal and transverse girder as well as the stability controls are presented in the main part. The requirements for the design of bearings and joints follow. The estimation of the slab reinforcement is also given. The final section of the thesis deals with a necessary controls in Serviceability Limit States, according to standard SIST EN 1993-2, which covers steel bridges.