论文部分内容阅读
文章将“船桥碰撞”与“车桥耦合”联系在一起进行研究,建立了斜拉桥、轻轨和船舶的三维非线性精细有限元模型,研究了轻轨列车-斜拉桥动态耦合系统在船舶碰撞下的动态响应。数值模拟过程分以下四步:桥梁初始成桥状态模拟,轻轨列车—斜拉桥动态耦合模拟,船舶与桥梁的碰撞模拟和桥梁—火车—船舶相互作用模拟。桥梁初始状态及大变形通过更新拉格朗日法和共旋转推导法来实现。通过与平面杆系有限元模型的计算结果进行比较,证实了全三维有限元建模方法在车—桥动态耦合响应分析中应用的准确性。研究通过基于罚函数的动态接触方法来实现车—桥耦合和船舶的碰撞过程,采用递归谱二分法的并行计算技术来缩短计算时间,基于显式中心差分插值法来进行数值求解,该方法证明在分析车—桥—船之间的耦合动态响应是一种有效的技术,为设计阶段模拟桥梁的动态特性提供了有效手段。结果表明,当发生船—桥碰撞时,轻轨列车运行到主桥塔附近行车安全的影响最大。
In this paper, the research on the “bridge collision” and “axle coupling” is carried out. The three-dimensional nonlinear finite element model of the cable-stayed bridge, light rail and ship is established. The dynamics of the light rail train- Dynamic response of coupled system under ship collision. The numerical simulation is divided into the following four steps: the simulation of initial bridge formation, the dynamic coupling simulation of light rail train - cable stayed bridge, the simulation of ship - bridge interaction and the simulation of bridge - train - ship interaction. The initial state of the bridge and the large deformation are realized by updating the Lagrange method and the common rotation derivation method. By comparing with the calculation results of the finite element model of plane bar system, the accuracy of the application of the all-dimensional finite element method in the dynamic coupled response analysis of vehicle-bridge is verified. In this paper, the dynamic contact method based on penalty function is used to realize the vehicle-bridge coupling and the ship’s collision process. The parallel computing technology of recursive spectral dichotomy is adopted to shorten the computation time and the numerical solution based on the explicit central difference interpolation method is provided. The analysis of coupling dynamic response between vehicle-bridge-ship is an effective technique, which provides an effective method for simulating the dynamic characteristics of bridges during the design phase. The results show that, when a ship-bridge collision occurs, the safety of the light rail train driving to the vicinity of the main bridge tower has the greatest impact.