Dynamic performance analysis of a seismically isolated bridge under braking force

This study establishes a dynamic equation for vehicle braking in the longitudinal direction in order to study the dynamic performance of seismically isolated railroad bridges under the most unfavorable loads in the longitudinal direction. A four or five-order Runge-Kutta method is adopted to obtain the time-history response of a wheel set under braking force. The quadratic discretization method is used to transform this time-history into a braking and bending force time-history of a structural fixed node, and a dynamic response analysis of the seismically isolated bridge under the vehicle's braking force is carried out using ANSYS, a universal finite element analysis software. Results indicate the following: seismic isolation design results in a more rational distribution of braking force among piers; the influence of the initial braking velocity on the vehicle braking force is negligible; the location where the first wheel set leaves the bridge is the most unfavorable parking location; a seismic isolation bridge bearing constructed according to typical design methods enters into a yield stage under the braking force, while the shearing force at the bottom of the pier declines as the isolation period is extended; and the design requirements can be met when the yield displacement of the seismic isolation bearing is less than 5 mm and the yield strength is greater than the braking force.

• Record URL:
  http://www.springerlink.com/content/v4507322277543u4/
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/16713664
• Authors:
  • Yu, Fang
  • Wen, Liuhan-heisha
  • Zhou, Fulin
  • Ye, Lieping
• Publication Date: 2012-3

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 35-42
• Serial:
  • Earthquake Engineering and Engineering Vibration
  • Volume: 11
  • Issue Number: 1
  • Publisher: Springer
  • ISSN: 1671-3664
  • EISSN: 1993-503X
  • Serial URL: http://link.springer.com/journal/11803

Subject/Index Terms

• TRT Terms: Base isolation; Braking; Bridge design; Dynamic structural analysis; Earthquake resistant design; Longitudinal strength; Railroad bridges
• Subject Areas: Bridges and other structures; Design; Railroads; I24: Design of Bridges and Retaining Walls;

Filing Info

• Accession Number: 01372706
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 15 2012 4:03PM