A Simple Procedure For Determination Of The Dynamic Ship-impact Load On Bridge Structures

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 vess...

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Bibliographic Details
Published in:WIT Transactions on the Built Environment 2014-01, Vol.141
Main Authors: Fan, W, Yuan, W C
Format: Article
Language:English
Subjects:
Bridge design
Bridge loads
Bridges
Bridges (structures)
Building codes
Collision dynamics
Crushing
Deformation
Dynamic structural analysis
Dynamics
Energy conservation
Finite element method
Frequency spectrum
High resolution
Impact loads
Inertial
Load
Load history
Loads (forces)
Mathematical analysis
Seismic analysis
Seismic design
Ship bridge collisions
Ships
Structural engineering
Structural safety
Superstructures
Urban environments
Vessels
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Summary: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.
ISSN:1746-4498
1743-3509
DOI:10.2495/SUSI140071