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本文围绕湘潭市湘江芙蓉大桥进行防撞设计,首先运用经验公式进行船撞力计算。以湘潭芙蓉大桥通航孔16#为例,通过有限元软件ANSYS/LS-DYNA模拟在不设防撞装置下2000t级船舶满载正撞双片桥墩、单片桥墩、满载侧桥向20°撞击顺桥向桥墩中部、角部及横桥向桥墩中部和在设防撞装置下2000t级船舶满载正撞及满载侧桥向20°撞击。同时整理出每种工况下的碰撞力及碰撞能量时程曲线。通过有限元软件分析比较桥墩有无防撞装置两种工况下的撞击力,来进行桥梁防撞系统的结构设计。研究结构表明:1.由各国经验公式计算的结果差异较大,需要结合有限元数值模拟计算船撞力;2.本文设计的自浮式D250型圆筒形截面复合材料防撞系统具有较大的变形能力和较强的缓冲吸能作用,不仅能减轻桥墩受损程度还能减缓船舶撞击时自身的损伤。
This article focuses on Xiangtan Hibiscus Bridge crash design, first of all, using empirical formula for calculation of ship collision force. Taking the No. 16 navigation hole of Furong Bridge in Xiangtan as an example, the full-load double-headed bridge pier, single-piers pier and full load side bridge of 2000t class ship with 20 ° crashworthiness are simulated by finite element software ANSYS / LS- Bridge to the middle of the pier, the corner and the bridge pier in the middle and under the anti-collision device 2000t class full load collision and full load side of the bridge 20 ° impact. At the same time sorting out the collision force under each working condition and collision energy time history curve. Through the finite element analysis of the bridge pier with or without anti-collision device under two conditions of impact, to bridge the structural design of the system. The structure of the study shows that: 1. The results calculated by the empirical formulas of different countries are quite different, and the ship collision force needs to be calculated in conjunction with the numerical simulation of the finite element method. 2. The self-floating D250-type cylindrical cross-section composite collision avoidance system designed in this paper has larger Deformation capacity and strong absorption of energy absorption, not only can reduce the damage of the bridge pier can also reduce the ship’s own damage when the impact.