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Vibration response of long cable-stayed timber footbridge – case study

Robert Kliger (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; Tomas Svensson ; Hanna Jansson ; Isak Svensson
Proceedings of International Conference on Timber Bridges 2013- Las Vegas, Nevada USA (2013)
[Konferensbidrag, refereegranskat]

Timber footbridges with a span larger than 30 meters are sensitive to vibrations and dynamic factors must therefore be taken into considerations in the design. A case study of a cable-stayed footbridge, Älvsbacka Bridge, with a free span of 130 meters, is presented. The dynamic design of the bridge is compared, based on the old Swedish code, BRO 2004 and the Eurocode 5. Simplified force models presented in BRO 2004 and the ISO 10137 international standard are compared. Vertical and lateral accelerations are measured on the bridge with accelerometers attached to the bridge deck. According to the simplified force model, the vertical acceleration limit was met for a group of twenty pedestrians, which was regarded as a reasonable design situation. From the measured accelerations, the damping factor was calculated as 1.2% of critical damping, which is twice the value used in design.

Nyckelord: pedestrian bridge, dynamic response, force models, damping



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Denna post skapades 2013-12-27. Senast ändrad 2015-02-10.
CPL Pubid: 190515

 

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