ABSTRACT
In the whole life process of the steel bridge, its components are slightly damaged under the long-term adverse action of steel property deterioration, environmental corrosion, dynamic load, and so on. With the accumulation of adverse action over time, the mechanical properties of steel bridges are decreased, which affects the safe and healthy service of steel bridges and casts adverse effects on traffic. Therefore, taking a truss steel railway bridge as an example, finite element analysis is used to simulate the damage forms such as cracking and support failure by modifying stiffness and connection types, and the influence of damage degree on the main girder on the static and dynamic force of the warren truss bridge is studied. The results show that the same damage has a great influence on the high-order mode shape and frequency, so it can be considered to use the high-order mode shape and frequency to reverse the structural damage.
