RTRI REPORT Jan. 2004
PAPERS

Impact Factors of Concrete Girders Corresponding to the Speed-up Trains

Masamichi SOGABE,  Nobuyuki MATSUMOTO,  Makoto KANAMORI,
Tsutomu SATO,  Hajime WAKUI


  The dynamic response of railway bridges is a problem of the resonant response of girders that occurs because bridges are excited at a constant period by running trains. In general, it is called "the speed effect of multiple-axle moving loads." In this study, vehicle running tests were performed to examine 56 bridges of various structural types with different span lengths. The impact factor was measured to be about 1.0 on five girders, and the damping ratio as low as 0.02. A revision of the railway design standard was proposed as a conclusion of this study, to cope with the speed-up of trains, based on the results of the above-mentioned vehicle running tests and numerical analysis.


* Full papers of RTRI Report are written in Japanese.

Copyright (c) 2004 Railway Technical Research Institute