Modular deck joints: investigations into structural behaviour and some implications for new joints

Environmental noise complaints from homeowners near bridges with modular expansion joints (MBEJ) led to an engineering investigation into the noise production mechanism. The investigation identified modal vibration frequencies in the MBEJ coupling with acoustic resonances in the chamber cast into the bridge abutment below the MBEJ. This initial acoustic investigation was soon overtaken by observations of fatigue induced cracking in structural beams transverse to the direction of traffic. Principally, this paper identifies the natural modes of vibration of the single support bar design MBEJ installed into Sydney’s Anzac Bridge and the welded multiple support bar design MBEJ installed into the southern abutment of the southbound carriageway of the bridge over the south channel of the Manning River (Taree By-pass). Secondly, the paper will report the dynamic amplification factors (DAF) obtained after extensive static and dynamic strain gauge measurements of both MBEJ’s. (a) For the covering entry of this conference, please see ITRD abstract no. E211602.


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  • Accession Number: 01011220
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0855886986
  • Files: ITRD, ATRI
  • Created Date: Dec 19 2005 2:54PM