The marine environment where coastal bridges are located is extremely complex and vulnerable to the threat of tsunami and storm surge disasters.The inclined T-shaped and box-shaped superstructures of bridges have different cross-sectional forms,and the wave forces acting on them under extreme wave conditions differ significantly,which requires further comparative study.Through numerical simulation using solitary waves to simulate tsunami-induced extreme waves,a numerical study on the effects of extreme waves on the tilted bridge deck structure is carried out.First,the accuracy of wave simulation and wave force calculation in the numerical wave flume is verified.Based on this,the characteristics of wave forces on T-girders and box girders under different submergence depths,wave heights,and bridge deck tilt angles are studied,and the differences in the forces on the two are compared.The results show that:Overall,the higher the wave height,the greater the vertical force,horizontal force,and moment on the two main girders;the peak horizontal force and vertical force of the T-girder and box girder often occur in the negative tilt angle range;When the T-girder and box girder are in the unsubmerged state,they are affected by wave slamming,and the wave force is mainly dominated by slamming force.The T-girder is affected by the space between the girder ribs,and the T-girder experiences multiple slamming actions,while the box girder experiences a single slamming action.The cross-sectional form of the main girder has a significant slamming on the wave force.In the semi-submerged case,and under the same wave height and tilt angle conditions,the vertical force and horizontal peak of the T-girder are greater than those of the box girder,which are dominated by the negative tilt angle.In the fully submerged case,the main girders are mainly subjected to the extreme wave dynamic water pressure,with the T-girder and box girder spaces being filled with water,and the geometric shape of their web plates has a small effect on the vertical dynamic water pressure,but has a significant influence on the peak horizontal force.
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