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以连续刚构桥为例,基于碰撞理论、能量泛函变分原理和边界等代原理,考虑了桥梁上部结构和桩土作用对桥墩的约束,建立了船桥偏心碰撞的计算模型,研究了扭转效应对撞击力的影响。与各国规范相比,本文考虑了船舶偏心以及桥墩的横向弯曲柔度和扭转柔度对桥墩撞击性能的影响。经过计算分析得知,偏心距的增大以及桥墩自由扭转惯性矩的减小均会使桥墩结构产生扭转振动的幅度增大,则削弱了桥墩的横向约束刚度,使得船舶撞击力减小,但冲击扭转效应会增大。
Taking a continuous rigid frame bridge as an example, considering the constraint of bridge superstructure and pile-soil interaction on bridge pier based on collision theory, energy functional variational principle and boundary equivalent principle, a computational model of eccentric collision of bridge is established. The effect of torsion on impact. Compared with national norms, this paper considers the impact of ship eccentricity and lateral bending flexibility and torsional flexibility of pier on the pier impact performance. After calculation and analysis, it is found that the increase of eccentricity and the decrease of free torsional moment of inertia of bridge piers will increase the amplitude of torsional vibration of bridge piers, which will weaken the lateral restraint stiffness of piers and reduce the impact force of ships. Impact reversal effect will increase.