Dynamic property control of bridge girders

The dynamic properties of bridge girders depend on the design solutions, namely replacement roadway slab by orthotropic, deviation from standard solutions in formation longitudinal schemes, and use a new type supports causing dissipation vibration energy gyropendulum effect.The control for with regard to multifactorial defects, is characterized ignoring shock dampers vehicles moving roadway. In this case, it advisable oscillatory processes within internal external strain boundaries, each which can be functionally solved dependencies between parameters static conditions elasticity plasticity. Long experience diagnosing bridges under varying load allows identifying critical moments limiting values properties, at integrity span-vehicle system violated. difference operation elements complicated influence wide range impacts, whose nature opposite mechanical impact vibra-tion such as all-round supports. criterion property are anti-phase vibrations girder their stiffness ratio. Based results, includes identification speed based various forms deformed state structure, including resonance; process system; requirements structures controlled adequate those numerical simulation 40 60 or 80 m longer; optimization modernization vibration-based diagnostics.