肇云大桥船撞概率风险及抗撞性能评估

Vessel Collision Probabilistic Risk of Zhaoyun Bridge and Anti-collision Performance Evaluation

肇云大桥为主跨738 m双塔双吊悬索桥,为评估桥墩结构抗撞性能是否满足要求,根据实际通航船舶现状,采用概率风险分析法确定设防代表船型为5000 t级船舶,通过有限元建模实现强迫振动法,得到船撞桥的撞击力动力响应,基于理想弹塑性模型,计算桥墩的等效屈服弯矩。结果表明:桥梁抗撞性能满足规范要求,桥墩构件最小安全储备系数为1.22,桥梁失效概率满足船撞作用设防水准L2级。

Zhaoyun Bridge is a boule-tower double-suspension bridge with a main span of 738 m.To evaluate the anti-collision performance of the bridge pier structure,according to the actual situation of navigating vessels,this paper used the probabilistic risk analysis method to determine that the design vessel of collision was the 5000-t class vessel.The forced vibration method was realized by finite element modeling to obtain the dynamic response of the vessel impact force.The equivalent yield bending moment of the bridge pier was calculated based on the ideal elastic-plastic model.The results showed that the anti-collision performance of the bridge can meet the specification requirements,the minimum safety reserve coefficient of the pier component was 1.22,and the bridge failure probability can meet level L2 of the design vessel impact force effect.