A shock transmission unit (STU) is a special mechanism used to link separate elements of structures. Considerable benefit can be gained by using STUs to link two or more separate elements to share out short-term impact forces applied to any one element by transmission to all the linked elements. In general, it is not possible to use a simpler permanent rigid strut-tie link because large extra forces would be generated between structures by the restraint of the links to long-term movements between the structures. The paper confines itself to bridge structures, which can benefit particularly from the use of STUs linked to the separate structural elements of the deck and the supports to share out horizontal impact loading on the deck between these supports. STUs can be used to advantage in both new bridges and in the strengthening of existing bridges, offering the latter the added advantage of minimum traffic disruption during installation. The paper describes the development of STUs in bridging, and provides typical STU response data for long-term and short-term movements and forces, together with details of unit design and manufacture. This is followed by examples of how STUs can be of benefit in the design of the substructures of new and strengthened existing multi-span bridges, particularly in earthquake zones. (A)


  • English

Media Info

  • Features: References;
  • Pagination: p. 82-95
  • Serial:
    • Volume: 116
    • Issue Number: 1

Subject/Index Terms

Filing Info

  • Accession Number: 00723148
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Jul 26 1996 12:00AM