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- Title
Dynamic performance analysis of a seismically isolated bridge under braking force.
- Authors
Yu, Fang; Wen, Liuhan; Zhou, Fulin; Ye, Lieping
- Abstract
In order to study the dynamic performance of seismically isolated bridges under the most unfavorable loads in the longitudinal direction, a dynamic equation for vehicle braking in the longitudinal direction is established. A four or fiveorder Runge-Kutta method is adopted to obtain the time-history response of a wheel set under braking force. The quadratic discretization method is then 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. According to the results, 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; 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.
- Subjects
DYNAMIC loads; EFFECT of earthquakes on bridges; AUTOMOBILE braking; SEISMIC response; RUNGE-Kutta formulas; FINITE element method software
- Publication
Earthquake Engineering & Engineering Vibration, 2012, Vol 11, Issue 2, p35
- ISSN
1671-3664
- Publication type
Article
- DOI
10.1007/s11803-012-0096-2