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钱江四桥是一座结构非常复杂的组合跨径双层钢管混凝土系杆拱拱桥。规划中的杭州地铁 1号线从该桥下层通过。为确保成桥后轨道交通运行的安全性与乘坐舒适性 ,对该桥主跨进行了车桥耦合振动分析。采用数值方法模拟了脉动风速场及轨道不平顺。桥梁结构采用有限元模型 ,机车车辆被简化为车体、转向架和轮对并包含阻尼器及弹簧的两个悬挂系统的体系 ,每节车辆共有 3 1个自由度。根据车桥耦合关系 ,并考虑桥上轨道不平顺以及侧向自然风的影响 ,分别计算了 40km/h及 80km/h车速下车辆和桥梁的响应。分析结果表明 ,在车速为 80km/h、风速高达 2 0m/s的情况下车辆运行的安全性和舒适性均能满足要求
Qianjiang four bridge is a very complex structure of composite double-span steel tube tied arch bridge. The planned Hangzhou Metro Line 1 passes below the bridge. In order to ensure the safety and ride comfort of the rail transit after the completion of the bridge, the axle-to-bridge coupling vibration analysis was carried out on the main span of the bridge. The numerical method is used to simulate the fluctuating wind speed field and track irregularities. The bridge structure uses a finite element model. The rolling stock is reduced to a body, bogie and wheelset system with two suspension systems consisting of a damper and a spring, each with a total of 31 degrees of freedom. According to the coupling relationship between the axle and the bridge, and taking into account the impact of irregular orbital irregularities on the bridge and lateral natural winds, the response of the vehicle and the bridge at 40km / h and 80km / h respectively is calculated. The results show that the safety and comfort of the vehicle can meet the requirements of the vehicle running at a speed of 80km / h and a wind speed of up to 20m / s