Dynamic Behaviour Of A Steel Plate Girder
Railroad Bridge With Rail Joints
Author(s)
H. M. Kim, S. I. Kim & W. S. Hwang
Abstract
This study investigates the effects of rail joints on the dynamic behaviour of
railroad bridges through a dynamic experiment. The subject bridge is a typical
steel plate girder railroad bridge. The bridge is 53.4m long, and consists of four
simply supported spans (4@12.10m). Rail joints are positioned in the third span.
It is 1.8m away from the starting point of the third span. The regular service train
applied the dynamic loading. The test train is composed of one diesel locomotive
and seven passenger carriages, which is commonly running on the existing
railroad lines in Korea. The range of measured speed is from 19.1 to 124.0km/hr.
Accelerometers are installed at the bottom flange of the centre of the third span
to acquire a bridge response caused by the rail joint. For comparison, another
accelerometer is installed at the same position of the first span, which has no rail
joint. From the measured results, Peak vale (PV), root mean square (RMS) and
dynamic amplification factor (DAF) value analysis are performed in order to
compare the instantaneous maximum and mean amplitude of acceleration at each
span. The result shows a significant increase in the acceleration of the span with
joints. In addition, DAF is from 0.22 to 1.92 for the measured speed zone. The
result also shows that rail joints on a bridge produce an impact effect. Thus, it
increases the dynamic response of the bridge and deteriorates ride comfort.
Keywords: rail joint, acceleration, impact load, dynamic amplified factor, steel
plate girder railroad bridge.
Keywords
rail joint, acceleration, impact load, dynamic amplified factor, steel
plate girder railroad bridge
Related Book
Other papers in this volume
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