某长江公路大桥防船撞设施研究

Research on Anti-ship Collision Facilities for a Highway Bridge of Changjiang River

摘要:

以某长江公路大桥为研究对象，通过规范和Midas /Civil软件计算出船舶撞击力和桥墩防撞能力，得出了中高洪水位期大桥自身抗撞能力不足的结论。为此，根据桥墩结构的特点和防撞需求，设计了一种自浮式钢覆复合材料防撞设施，并采用LS-DYNA有限元分析软件建立船-桥碰撞模型进行不同工况的模拟。研究结果表明，该防船撞装置能够有效减少桥墩所受的船舶撞击力并延迟撞击时间，船舶撞击力峰值降低幅度可达30%～39%，具有很好的防撞消能效果。

Abstract:

Taking a highway bridge of Changjiang River as the object of study, the impact force of ship and the anti-collision ability of pier are calculated by the specifications and Midas /Civil software. The conclusion is obtained that the anti-collision ability of the bridge itself is not sufficient during the period of medium and high flood stages. Therefore, according to the characteristics and anti-collision requirements of bridge pier structure, a self-floating steel clad composite material anti-collision device is designed, and LS-DYNA software is used to build the ship-bridge collision model to simulate the different working conditions. The results show that the anti-ship collision device can effectively reduce the ship impact force on bridge piers and delay the impact time, and the peak value of ship impact force can be reduced by 30%~39%, which has a good anti-collision and energy-dissipation effects.