Footbridge design for synchronous lateral excitation

It is well known that longer span footbridges can feel lively to those walking over them. However it is now clear that there is an effect which is not subjective. It is called Synchronous Lateral Excitation (SLE), and when it occurs normal walking on the footbridge is disrupted. The purpose of this paper is to show how a footbridge can be designed to take account of SLE. For susceptible designs the relationship between the key parameters is studied in order to understand how the designs can be made non-susceptible. A distinction is made between elevated walkways, where most of the lateral flexibility is in the substructure, and long span footbridges, where most of the lateral flexibility is in the span. The former may have critical lateral frequencies even with short spans. SLE can occur in bridges of any span. The inherent damping of modern footbridges is often very low, and designers will be surprised how many designs require additional dampers to meet the requirements of SLE. Configurations for dampers are discussed briefly. (a) For the covering entry of this conference, please see ITRD abstract no. E211602.


  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01011356
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0855886986
  • Files: ITRD, ATRI
  • Created Date: Dec 19 2005 3:05PM