A Simple Procedure For Determination Of The
Dynamic Ship-impact Load On Bridge Structures
Author(s)
W. Fan & W. C. Yuan
Abstract
An equivalent static force is usually used to represent vessel-impact load exerted
on bridge structures in current bridge design codes. However, this static
procedure using the code-prescribed loads cannot consider dynamic effects (e.g.
inertial force related to superstructure mass). Hence, the vessel-impact responses
of bridges may be significantly underestimated and the structural safety cannot
be warranted in practice. In this paper, a simple procedure is proposed to define
the dynamic ship-impact loads on bridge structures. Firstly, the equations to
determine the duration of loading and the maximum ship-bow crush depth are
developed based upon principles of conservation of energy and linear
momentum during a collision event. Using the above equations and the
relationships between crush depth and time, the dynamic ship-impact loads are
determined based on ship bow force-deformation curves (P-a curves). For the
generated ship-impact load histories, the amplitude, duration and frequency
spectra are compared with the results from the high-resolution finite element
analyses of ship-bridge collisions. It is found that these parameters are in good
agreement with the high-resolution analysis results and the developed procedure
can be readily employed to determine the vessel-impact responses of bridge
structures like the time history analysis in seismic design.
Keywords: impact load, ship collision, bridge structure, P-a curve.
Keywords
impact load, ship collision, bridge structure, P-a curve.
Related Book
Other papers in this volume
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