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Dynamic performance analysis of a seismically isolated bridge under braking force
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Journal Article
Dynamic performance analysis of a seismically isolated bridge under braking force
2012
Overview
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 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 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.
Publisher
Institute of Engineering Mechanics, China Earthquake Administration,Springer Nature B.V,Shenzhen Municipal Design and Research Institute Co. limited, Shenzhen 518029, China%Earthquake Engineering Research & Test Center of Guangzhou University, Guangzhou 510405, China%Department of Civil Engineering, Tsinghua University, Beijing 100084, China,Department of Civil Engineering, Tsinghua University, Beijing 100084, China
