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综合考虑了车流随机性和桥面等级退化等因素,提出了一种新的分析模型,该模型能分析在役桥梁不同服役期间在交通荷载及风耦合作用下的桥梁动态响应。基于已有车辆模型,建立了一个可考虑车辆纵向振动的18自由度空间车辆模型,考虑邻近车辆影响基础之上的改进CA(Cellular Automation-元胞自动机)模型和桥面退化模型,并引入等效车轮荷载的方法,通过风、桥梁和车辆相互作用关系,建立了风-车流-桥梁系统的耦合振动分析模型。数值计算表明:该文所提出的方法能够合理的模拟风-车流-桥梁系统的耦合振动。
Considering the randomness of traffic flow and the degradation of deck grade, a new analytical model is proposed, which can analyze the dynamic response of bridges under the traffic load and wind coupling during service. Based on the existing vehicle model, an 18-DOF space vehicle model considering vehicle longitudinal vibration was established, and the improved CA (cellular auto-cellular) model and deck degradation model considering the influence of neighboring vehicles were established and introduced Equivalent wheel load method is used to establish the coupling vibration analysis model of wind-flow-bridge system through the interaction between wind, bridge and vehicle. The numerical results show that the proposed method can reasonably simulate the coupled vibration of the wind-flow-bridge system.