梅山水道桥主墩承台抗船撞性能分析及防撞设施设计

Ship Collision Resistance Performance Analysis and Anti-collision Facility Design of Main Pier Cap of Meishan Waterway Bridge

文章基于对宁波舟山港六横公路大桥工程梅山水道桥的通航水域标高长期维持不变的考量,开展主墩防船撞性能及防撞设施方案研究。以梅山水道桥主墩承台为研究对象,建立全桥MIDAS有限元模型,根据公路桥梁抗撞设计规范,确定承台在考虑船撞作用的偶然组合下作用效应设计值远小于承台的抗剪承载力,因此本体已具有整体抗撞能力,可采用局部防船撞设施对可能撞损的部位进行局部防护。设置SA400橡胶护舷横向布置方案,根据所处水域及船型特点,论证确定橡胶护舷的合理布置间距,瞬态船撞仿真结果表明,该型号具有延缓船头与桥墩相撞时间、降低撞击力、保护承台、分散应力集中范围的优势。

Based on the consideration of the long-term maintenance of the elevation of the navigable water area of Meishan Waterway Bridge in Ningbo Zhoushan Port Liuheng Highway Bridge Project, this paper carries out the research on the ship collision resistance performance and anti-collision facilities of the main pier. Taking the main pile cap of Meishan waterway bridge as the research object,the MIDAS finite element model of the whole bridge is established. According to the anti-collision design code of the highway bridge, it is determined that the design value of the action effect of the cap under the accidental combination of ship collision is far less than the shear bearing capacity of the cap. Therefore, the body has the overall anti-collision capacity, and the local anti-collision facilities can be used to protect the parts that may be damaged by collision. The SA400 rubber fender transverse arrangement scheme of is set up. According to the characteristics of the water area and the ship type, the reasonable arrangement spacing of the rubber fender is demonstrated and determined. The transient ship collision simulation results show that the model has the advantages of delaying the collision time between the bow and the pier, reducing the impact force, protecting the cap and dispersing the stress concentration range.