Dynamic Demand of Bridge Structure Subjected to Vessel Impact Using Simplified Interaction Model
Publication: Journal of Bridge Engineering
Volume 16, Issue 1
Abstract
Assessing the dynamic demand using general-purpose finite-element codes is not only low in efficiency, but also unaccepted in practical application due to the complicated nonlinear dynamical behaviors of vessel-bridge collision. In this paper, an alternative simplified interaction model is presented to evaluate the dynamic demand of bridge structure under vessel impact efficiently. In this method, ship motion is regarded as the motion of single degree of freedom, and ship-bow is modeled by a nonlinear spring element (only compression) connected to bridge structure. A quasi-static method is employed to obtain the nonlinear static relationships between impact forces and crush depths of ship-bow, and the effect of the height of pile cap is discussed. Based on two different approaches, the influence of strain-rate effect on impact force is taken into account to obtain the corresponding dynamic crush curves, which are developed for the proposed interaction model. Results show that the dynamic responses of bridge structures using the simplified interaction models are in good agreement with the general-purpose collision analyses, while the former computation efficiency is improved obviously.
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Acknowledgments
This research is supported by Ministry of Science and Technology of China, Grant No. MEXT-JPSLDRCE 09-B-08, and the National Science Foundation of China, Grant Nos. NSFC50778131, NSFC50978194, and NSFC90915011. The finite-element model of ship in this paper is from Prof. Jumjie Wang and his students’ researches. The writers are also indebted to Prof. Wang for providing this model.
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Information & Authors
Information
Published In
Journal of Bridge Engineering
Volume 16 • Issue 1 • January 2011
Pages: 117 - 126
Copyright
© 2011 ASCE.
History
Received: Aug 17, 2009
Accepted: May 25, 2010
Published online: Dec 15, 2010
Published in print: Jan 2011
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