Experimental Evaluation Of Dynamic Properties
Of An Incrementally Prestressed Concrete Girder
Railway Bridge
Author(s)
S. I. Kim, I. H. Yeo, N. S. Kim, J. W. Kwark & J. S. Lee
Abstract
The estimation of exact dynamic behavior is very important in railway bridges
which can undergo resonance state from repetitive moving axle forces with
uniform intervals. The dynamic interaction between bridge superstructures and
passing trains is one of the critical issues concerning newly developed bridges
designed with more flexibility. Therefore, it is very important to evaluate the
modal parameters of PSC girders that have been newly designed before doing
dynamic analyses. In this paper, a full scale incrementally prestressed concrete
girder of 25 meters long as a test specimen was fabricated and modal testing on it
at every prestressing stage was carried out to evaluate the modal parameters,
including the natural frequency and the modal damping ratio. Young’s modulus
was also obtained from global stiffness of the test specimen. During the modal
testing, a digitally controlled vibration exciter as well as an impact hammer is
applied, in order to obtain precise frequency response functions, and the modal
parameters were evaluated with various construction stages.
Keywords: railway bridge, modal test, dynamic performance estimation, moving
train analysis.
1 Introduction
Repetitive moving forces with uniform intervals induced from a passing train can
cause some undesirable behavior of railway bridges. The resonance of a structure
can be broken out when the natural frequency of the bridge coincides with the
Keywords
railway bridge, modal test, dynamic performance estimation, moving
train analysis.
Related Book
Other papers in this volume
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