Simplified impact load model for ship-bridge collisions

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (5) : 60-70.

SONG Yanchen1,WANG Junjie1,YIN Haijiao2,LIU Huijie1

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Abstract

The ship-bridge impact force in most current codes worldwide is taken as an equivalent static force to ignore dynamic effect between structures due to ship-bridge collisions. In order to establish a simplified impact load model as a better alternative of the equivalent static load, 5 finite element models of ships were built. A ship rigid wall head-on collision model was used to simulate ship-bridge collision processes. 45 impact force time history samples under different impact velocities were obtained through numerical simulation. A modified half-wave sine function model was proposed to approximately describe impact force sample processes and the model’s parameters were determined with statistical analysis. Finally, taking a continuous girder bridge as an example, the ship-bridge contact impact response analysis and the impact force time history analysis were conducted. The response-solving error of the modified half-wave sine load model was classified into three types. Then the contribution of each type error to the structural response error was estimated. The example results showed that the modified half-wave sine load model proposed here has a good solving accuracy and is valuable for practical application.

Key words

Ship-Bridge Collision / Ship / Dynamic Effects / Impact Force Time History / Simplified Impact Load Model

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SONG Yanchen1,WANG Junjie1,YIN Haijiao2,LIU Huijie1. Simplified impact load model for ship-bridge collisions[J]. Journal of Vibration and Shock, 2019, 38(5): 60-70

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