Advanced load models for synchronous pedestrian excitation and optimised design guidelines for steel footbridges
The aims of this project were to develop advanced load models for synchronous pedestrian excitation and to conclude the results in optimised design guidelines for steel footbridges. Based on extensive measurements on a test rig, a practical and simple spectral load model was derived that can be used for the determination of vibrations for sinusoidal mode shapes. Also a design load model for FEM (finite element method) calculations was developed that allows for different pedestrian densities and all types of mode shapes. Measurements of vibration behaviour due to different pedestrian loadings on nine lively footbridges were used to check and verify the developed load models. Moreover, questionnaires on comfort were conducted, and synchronisation effects during events were investigated. The most important outputs are several load models of differing complexity as well as the design methodology. Due to differences in complexity, and depending on the design stage, the designer can choose the most adequate load model for his purposes. As it is very difficult to specify unique comfort criteria, the definition of comfort criteria is recommended for each footbridge, with regard to the expected traffic amount and the location of the bridge. Much flexibility in the design is therefore allowed, and relevant influence factors on loading and perception and judgement of vibration should be considered. Clients and designers of footbridges now have a powerful tool (design guidelines with various load models) to more accurately specify and predict the vibration behaviour of footbridges resulting from pedestrian traffic.
Bibliographic Reference: EUR 23318 EN (2008), 167 pp. Free of charge
Availability: http://bookshop.europa.eu/is-bin/INTERSHOP.enfinity/WFS/EU-Bookshop-Site/en_GB/-/EUR/ViewPublication-Start?PublicationKey=KINA23318 (Catalogue Number: KI-NA-23318-EN-S)
ISBN: ISBN: 978-92-79-08303-7
Record Number: 200910008 / Last updated on: 2008-11-20
Original language: en
Available languages: en