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.

• Record URL:
  https://doi.org/10.1061/9780784412367.054
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/9780784412367
• Supplemental Notes:
  • © 2012 American Society of Civil Engineers.
• Corporate Authors:

  American Society of Civil Engineers

  1801 Alexander Bell Drive
  Reston, VA  United States  20191-4400
• Authors:
  • Monzon, Eric V
  • Wei, Chunli
  • Buckle, Ian G
  • Itani, Ahmad
• Conference:
  • Structures Congress 2012
  • Location: Chicago Illinois, United States
  • Date: 2012-3-29 to 2012-3-31
• Publication Date: 2012-3

Language

• English

Media Info

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

Subject/Index Terms

• TRT Terms: Base isolation; Bridge superstructures; Curved bridges; Dislocation (Geology); Earthquake engineering; Girder bridges; Scale models; Shaking table tests
• Uncontrolled Terms: Hybrid methods
• Subject Areas: Bridges and other structures; Design; Highways; I24: Design of Bridges and Retaining Walls;

Filing Info

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