Eigenschaften von Stabbogenbrücken bei dynamischer Anregung und abgestimmte Ermüdungslastmodelle

Characteristics of steel bowstring bridges under dynamic excitation and tuned fatigue load models.

Lateral arch vibrations, resulting from crossing vehicles, are frequently observed at existing steel bowstring bridges. The long post oscillation induces a large fatigue load for the arch and the adjacent construction components. Also, it feels uncomfortable to persons on the bridge. This problem always occurs at the same, widespread steel bowstring bridge type.
Hence, the dynamic behavior of the lateral arch vibration is analyzed here. Therefore, the arch is extracted from the bridge system and its differential equation is examined. Moreover, the energy flow is considered, which arises especially between the two arches.
Also, two tuned fatigue load models are proposed for the vibration susceptible arch. Adjustable distance between axles and adjustable speed of vehicles are introduced for these to excite lateral arch vibrations.