船桥碰撞过程中桥墩塑性防撞装置性能研究

发布时间：2018-10-30 18:58

【摘要】：随着交通运输的发展,船桥碰撞事件时有发生。现有规范中撞击力计算公式通常只考虑船舶质量和速度,对刚度考虑不足。本文利用有限元软件ANSYS LS-DYNA进行仿真模拟,以不同的钢板厚度反映刚度变化,分析船舶结构和防撞装置刚度变化对撞击力以及碰撞过程的影响。研究结果表明:碰撞过程中船舶的动能主要被防撞装置和船舶结构通过塑性变形吸收,防撞装置相对刚度越小,其吸收的碰撞能越大;最大撞击力主要受船舶结构和防撞装置二者刚度较小者的影响,船舶结构刚度相对较小时,最大撞击力随船舶结构刚度的增加而增加;防撞装置的刚度较小时,最大撞击力随着防撞装置刚度的增加而增加;在进行桥梁防撞设计和验算时,除要考虑船舶刚度的影响外,还应根据通航水域的实际情况,确定防撞装置钢板厚度的合理范围。
[Abstract]:With the development of transportation, the collision of ships and bridges happens frequently. In the existing codes, the calculation formulas of impact force usually only consider the mass and velocity of ship, but not the stiffness. In this paper, the finite element software ANSYS LS-DYNA is used to simulate and analyze the influence of the stiffness change of ship structure and anti-collision device on the impact force and the process of collision with different thickness of steel plate. The results show that the kinetic energy of the ship is mainly absorbed by the anti-collision device and the ship structure through plastic deformation during the collision. The smaller the relative stiffness of the anti-collision device is, the larger the collision energy is absorbed. The maximum impact force is mainly affected by the smaller stiffness of the ship structure and the anti-collision device. The stiffness of the ship structure is relatively small, and the maximum impact force increases with the increase of the ship structure stiffness. When the stiffness of the anti-collision device is small, the maximum impact force increases with the increase of the stiffness of the anti-collision device. In the design of bridge collision prevention and checking calculation, besides considering the influence of ship stiffness, the reasonable range of steel plate thickness of anti-collision device should be determined according to the actual conditions of navigable waters.
【作者单位】：北京交通大学土木建筑工程学院;
【分类号】：U443.26

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