Effects of pedestrian excitation on two short-span FRP footbridges in Delft

Stana Živanović*, Justin Russell, Marko Pavlović, Xiaojun Wei, J. Toby Mottram

*Corresponding author for this work

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

1 Citation (Scopus)

Abstract

Reported in this paper is an evaluation of the vibration behaviour of two footbridges in The Netherlands having main spans of about 15 m. Short-span footbridges over canals and rivers are embedded in the landscape of Delft and elsewhere. Increasingly, these bridges are made of Fibre-Reinforced Polymer (FRP) composites, utilising the high-strength and light-weight nature of the material, and taking advantage of fast installation and low maintenance costs. Due to low mass, these FRP bridges might be sensitive to dynamic excitation by human actions. The two footbridges investigated in this paper have the main bearing structure which consists of either two or four longitudinal beams made of vacuum infused FRPs with foam cores connected by an FRP deck. Modal testing revealed that fundamental vertical natural frequency of the two structures at 4.8 and 6.1 Hz is in the range typical of similar structures made of concrete and steel, whilst the corresponding damping ratio for the wider, slightly cambered, bridge was exceptionally high at 7.9%. The vibration response to dynamic force by people walking was typically up to 1 m/s2. While both of these light-weight structures performed satisfactorily under the regular pedestrian loading, the higher frequency – higher damping structure represents an example of successful control of pedestrian-induced vibrations by means of longitudinal restraints at the end supports and slightly curved shape of the main structure.
Original languageEnglish
Title of host publicationDynamics of Civil Structures, Volume 2 - Proceedings of the 36th IMAC, A Conference and Exposition on Structural Dynamics 2018
EditorsShamim Pakzad
PublisherSpringer
Pages143-150
Number of pages8
Volume2
ISBN (Print)9783319744209
DOIs
Publication statusPublished - 2019
EventSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2018 - Greenville, United States
Duration: 4 Jun 20187 Jun 2018

Conference

ConferenceSEM Annual Conference and Exposition on Experimental and Applied Mechanics, 2018
CountryUnited States
CityGreenville
Period4/06/187/06/18

Keywords

  • FRP composites
  • Modal properties
  • Short-span footbridges
  • Vibration
  • Walking

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