| Abstract [eng] |
The paper analyzes the strength and deformability of the Bridge across the Minija River, built in Lithuania, in assessing the influence of steel corrosion. The bridge over the Minija River was built in 1921 according to German design standards DIN 1072. The bridge is two spans; the bridge overlay consists of two arched type metal trusses. In this work, theoretical calculations are made of the changes in the stresses and the deflection of the bridge if the cross-sectional area of the metal retaining elements is reduced. After the visual inspection of the bridge, it was found that from 10 to 15 percent there is a decrease in the cross-sectional area of the bearing elements due to corrosion in them. In the work, the safety of the bridge (evaluating the influence of corrosion and other possible factors) was proposed to estimate the safety factor of the bridge. The bridge's safety factor depends on the strength of the bridge, the impact of heavy vehicles, the dynamics of the bridge, the variables and the constant load factors. The thesis provides an in-depth analysis of how the bridge's safety factor varies in different scenarios: if an inspection changes, dynamic loads increase if the overlay dynamic coefficient increases, or if several parameters deteriorate at the same time. At the end of the paper, conclusions and recommendations regarding the strength, deformability and safe operation of the bridge are presented. |
