In order to design a anti-ship collision device with viscous dampers and study its protection performance,a finite element collision system model was established with reference to the design drawings of the North Branch Bridge of the Nanjing Second Yangtze River Bridge,and numerical dynamic computation methods were used to evaluate its protection performance in terms of the peak impact force and the collision depth.The anti-ship collision performance of the anti-ship collision device was analyzed under different cross-sectional shapes of support columns and different numbers of viscous dampers.The results show that with the increase of the number of viscous dampers,the peak impact force firstly decreases and then increases,and the collision depth gradually decreases.When the cross-sectional shape of the support column is circular,the peak impact force is reduced by 5.90%and the damage of the collision depth of the anti-ship collision device is reduced by 0.21 m compared with the anti-ship collision prevention device without viscous dampers.The best ship impact prevention performance is achieved when the cross-sectional shapes of the support columns of the anti-ship collision device is a circular lattice structure and the number of viscous dampers is two.
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