Title: Seismic Performance of Unreinforced Concrete Railroad Bridge Piers
Author(s): Qiang Gui and Zhongguo John Ma
Publication: Symposium Paper
Appears on pages(s): 114-128
Keywords: continuous rail track, nonlinear link element, railroad bridge, restraining effect, seismic performance, shaking table, video analysis
Research on the seismic performance of unreinforced concrete railroad bridge substructures is presented.
The restraining effect of a continuous rail track structure, which is considered to contribute to better seismic
performance of railroad bridges compared with highway bridges, was investigated. A numerical modelling scheme
that takes into consideration the nonlinear properties of the ballast and bearings as well as steel and concrete materials
was proposed and validated using previous full-scale field testing. The equivalent spring stiffness of the rail track
system was obtained and used in the subsequent small-scale shaking table experiment, which investigated the dynamic
response of column-shaped rigid body specimens with a spring restraint on the top. Several parameters were
considered in the test matrix such as the stiffness of the restraint spring, the height/breadth ratio, the ground excitation, and single-body or multi-body configurations. Discussion regarding the testing results are also presented.