基于船-桥碰撞接触时间的船撞力简化计算方法-《建筑科学与工程学报》

文章信息/Info

Title:: Simplified Calculation Method of Impact Force Based on Vessel-bridge Collision Contact Time

Author(s):: FANG Hai, HAN Juan, LIU Wei-qing, ZHU Lu, ZHUANG Yong; College of Civil Engineering, Nanjing Tech University

Keywords:: vessel-bridge collision; contact time; impact force; simplified calculation method

摘要:: 通过数值模拟初步分析了不同吨位船舶撞击代表性桥梁工程的接触时间，根据船桥碰撞动力学模型得出了船撞力和接触时间的理论解；分析了船舶质量、初始撞击速度、船艏刚度以及桥墩刚度等参数对碰撞接触时间的影响，拟合出碰撞接触时间的简化计算公式，并通过实际船桥碰撞工程的数值模拟对简化计算公式进行了验证，从而修正了中国《公路桥涵设计通用规范》中关于漂浮物撞击桥梁的碰撞接触时间的定义；基于冲量定理分析了船桥碰撞接触时间与峰值船撞力的关系，研究了船撞力时程曲线与正弦波和三角波的关系，并与数值模拟结果进行了对比分析，建立了峰值船撞力简化计算公式。结果表明：船桥碰撞接触时间与船舶质量和接触刚度有关；峰值撞击力计算值与数值模拟结果吻合较好。

Abstract:: The contact time of representative bridges impacted by different tonnages vessel was analyzed preliminarily using numerical simulation. According to vessel-bridge collision dynamics model, the theoretical solutions of impact force and contact time were obtained. The influences of parameters, such as mass of ship, initial impact velocity and stiffness of ship and pier, on contact time were analyzed. The simplified calculation formula of contact time was obtained by data fitting, and verified by numerical simulation through practical vesselbridge collision engineering. The definition of contact time of floating debrisbridge collision in General Code for Design of Highway Bridges and Culverts was amended. Based on impulse theorem, the relation between contact time of vesselbridge collision and peak impact force was analyzed. The relationships between time history curves of impact force and sine wave and triangular wave were studied, and compared with the numerical simulation results. The simplified calculation formula of peak impact force was established. The results show that contact time of vessel-bridge collision is related to mass of ship and contact stiffness. The calculation values of peak impact force agree well with the numerical simulation results.