Analytical Study on the Collision Load Distribution Between a Large Vessel and a Cable Stayed Bridge Tower Due To Tsunami

Abstract eng:
By the tsunami on 11 March 2011, many vessels drifted and they caused not a few damages on bridge structures such as the collision between a vessel and a pier or a superstructure. In order to design tsunami resisting structures, it is required to clarify the influence of the collision force on the bridge structure. In this study, in order to clarify the collision load distribution when a large vessel drifted by tsunami collides with bridge structures, collision analyses using FEM were conducted. Here in, it was presupposed that the drifted large vessel would collide with a tower of a long span cable stayed bridge with 1000 m length. Taking account of various collision conditions, the parametric analyses which were varied with collision positions and collision directions carried out. It was found that the collision load when the vessel collided with the lower part of the tower was larger than it when the vessel collided with upper part of the tower. And the collision load when the vessel collided in a vertical direction was smaller than it when the vessel collided in horizontal direction. Additionally, we compared the value of a collision load formula based on a log normal distribution and it calculated from the FE analytical result. From the result, the maximum collision load of FE result was a little larger than it of the formula due to the difference in the vessel behavior evaluation after the collision.

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