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外部环境激励下的车桥耦合振动严重影响着自动化码头集装箱小车-低架桥结构的安全和使用效率。针对该问题,基于一元多维平稳随机过程数值模拟法实现轨道不平顺、风速场的时程模拟,利用双协调自由界面模态综合法求解了车桥结构在轨道不平顺、轮对蛇行运动以及风、地震载荷激励下的耦合振动时域响应,分析了风、地震载荷等对车桥耦合振动响应的影响,并设计结构模型试验验证自激激励仿真结果。结果表明:1)自由界面模态综合求解车桥耦合振动响应的仿真方法合理;2)车桥竖向振动主要由小车移动加载引起,自激激励是主因;风、地震载荷会大大增强横向振动,车桥耦合振动响应随着小车速度、脉动风平均风速的增大而增大,且对地震载荷的敏感程度大于工作状态风载荷;3)小车复线运行时车桥耦合振动响应最大值大于小车单线运行时,铅芯橡胶支座可有效减小车桥加速度响应。
The vibration of the axle-bridge coupled with the external environment seriously affects the safety and efficiency of the automated terminal container car-low-bridge structure. In order to solve this problem, the time-history simulation of track irregularity and wind speed field is realized based on the numerical simulation method of one-dimensional multi-dimensional stationary stochastic process. The two-coordinate free-form modal synthesis method is used to solve the problem that the structure of the axle in irregular orbit, , The time-domain response of coupled vibration under seismic load excitation, the influence of wind and earthquake loads on the vibration response of the vehicle-bridge coupling was analyzed, and the simulation results of self-excited excitation were designed by structural model test. The results show that: 1) The simulation method of the free-surface modal integrated solution for the vibration response of the bridge-axle coupling is reasonable; 2) the vertical vibration of the axle is mainly caused by the moving loading of the vehicle; the self-excitation is the main cause; the wind and earthquake loads greatly enhance the lateral vibration , The vibration response of the vehicle-bridge coupling increases with the increase of car speed and the mean wind speed of pulsating wind, and the sensitivity to earthquake load is greater than that of working wind load. 3) The maximum response of the bridge- In single-line operation, the lead rubber bearing can effectively reduce the acceleration response of the axle.