A Study On The Comparison Of Dynamic
Behaviour Of High Speed Railway Bridges
Author(s)
S. I. Kim, H. M. Kim & I. H. Yeo
Abstract
The dynamic behaviour of two steel bridges crossed by the Korean High Speed
Train (KTX) has been investigated experimentally and the results are compared
with the specification requirement and other typical prestressed concrete box
girder bridge’s responses. The investigated bridges are 2-girder steel bridges of
1@40m span length, 2@50m span length, and a PSC Box girder bridge of
2@40m span length. A set of experimental tests were performed during the
operation of KTX, and a number of accelerometers, LVDTs and ring-type
displacement transducers were utilized for measurement of three kinds of
dynamic responses (acceleration, deflection, and end-rotation angle). The
measured responses show that the vertical deflections and end-rotation angles of
the three bridges all satisfy the specification requirement with a large margin, but
acceleration responses that are very close or exceed the limit value were also
found. Most of the excessive acceleration responses were found when the
passing speed of the train is close to the critical velocity, which causes
resonance. No noticeable differences of dynamic responses due to the different
materials (steel or concrete) could be found within these experimental results.
Keywords: high speed railway bridge, bridge-train interaction, moving load.
1 Introduction
A high speed railway bridge must support trains travelling at speeds of up to 350
km/h. The possibility of resonance occurring due to the cyclic dynamic load is
extremely high. For this reason, safety evaluation and dynamic movement
evaluation are both critical elements in the development of a high speed railway
bridge.
Keywords
high speed railway bridge, bridge-train interaction, moving load
Related Book
Other papers in this volume
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