基于能量的船桥碰撞力计算方法

以有限元分析为基础,对1万t级的船舶分别采用不同的撞击速度对桥梁进行正撞分析,得到最大正撞力.采用回归分析方法,比较了船舶初始动量与最大正撞力、初始动能与最大撞击力之间的关系,得到相应的计算公式.与AASHTO公式、修正的G.Wosion公式进行了比较和误差分析,结果表明,基于能量的桥梁船撞力计算方法能很好地计算出船撞力,且误较小.同时,该方法的计算结果很好地反映了船舶初始动能与撞击力之间的关系,并且形式简单,计算方便.

Method for ship-bridge Collision Force Calculation Based on Energy

Based on dynamic finite element analysis,frontal impact force of bridge-ship collision with different weight and velocities are gained.The relationship between the initial momentum of ship and frontal Impact force and that between the initial kinetic energy and frontal Impact force are analyzed by regression analysis method,and the formulate are gained accordingly.Compared to the results of AASHTO and G.Wosion,the results gained from the method for bridge-ship collision force calculation based on energy are more accurate,and also,this method is clear and direct,which opens up a new idea for the bridge-ship collision force analysis and reflects the relationship between the initial kinetic energy of ship and bridge directly,and also be good for the vulnerability and risk analysis for the bridge-ship collision.