撞击模拟分析在桥梁船撞安全性评估中的实践

Practical Application of Impact Simulation Analysis in Bridge-ship Collision Safety Assessment

摘要:

桥梁梁体遭受船舶撞击后，迅速而准确地进行损伤后安全性评估是制定维修加固措施的基础。以国内某连续箱梁桥为例，通过撞击模拟分析方法进行了梁体船撞损伤后的安全性评估，结合工程实践对评估方法进行总结。首先根据规范公式确定了船撞力，以箱梁实际碰撞剪切破坏长度进行了验证；然后通过数值方法模拟了船舶与桥梁的碰撞过程，确定了箱梁腹板的撞击损伤影响范围，分析了腹板和钢束损伤对梁体受力重分配等方面的影响；最后根据撞击模拟分析的结果进行了桥梁结构安全性评估。提出的撞击模拟分析方法能够真实还原桥梁梁体遭受船舶撞击后的变化历程，并准确反映梁体的真实受损情况，可以作为下一步制定维修加固方案的理论依据。

Abstract:

After the bridge girder is hit by ship, the rapid and accurate safety assessment of the girders is the basis for preparing the maintenance and reinforcement measures. Taking a continuous box girder bridge in China as an example, the safety assessment of the girders after ship collision is carried out through the impact simulation analysis methods, and the assessment method is summarized in combination with the engineering practice. Firstly, based on the formula of the specification, the ship collision force is determined to verify the actual collision and shear failure length of the box girder. Then, the collision process of ship and bridge is simulated by numerical methods to determine the impact range of the collision damage on the web plate of the box girder. And the impact of the web plate and steel bundle damage on the force redistribution of the girder is analyzed. Finally, based on the results of the impact simulation analysis, the safety of the bridge structure is assessed. The proposed impact simulation analysis method can truly restore the change process of the bridge girder after being hit by a ship and accurately reflect the real damage situation of the girder, which can be used as a theoretical basis for the next step of preparing the maintenance and reinforcement schemes.