Seismic Response of Full and Hybrid Isolated Curved Bridges

A 0.4-scale model of a highly curved, 3-span, steel girder bridge with two different configurations of protective systems was experimentally studied using the Network for Earthquake Engineering (NEES) shake table array at the University of Nevada. In the first configuration isolators are provided at all supports ("full isolation") while in the second configuration isolators are only provided at the abutments ("hybrid isolation"). The isolators in the first case were designed such that the columns remained elastic under the design earthquake. On the other hand, the isolators in the latter case were designed to not only keep the columns elastic but also substantially reduce the superstructure displacements. This paper presents and compares bridge response, isolator performance, and column performance for the two cases. It is shown that both techniques are successful at protecting the columns, even during the maximum considered earthquake (150% design earthquake). It is also shown that the hybrid isolation technique reduced the superstructure displacements by a factor of about one-half, accompanied by a corresponding increase in the abutment shear forces.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 603-612
  • Monograph Title: Structures Congress 2012

Subject/Index Terms

Filing Info

  • Accession Number: 01502361
  • Record Type: Publication
  • ISBN: 9780784412367
  • Files: TRIS, ASCE
  • Created Date: Nov 12 2013 2:28PM