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以某主跨110m的自锚式钢管混凝土中承桁架拱桥为对象,分析了该桥的自由振动特性和移动车辆荷载作用下主跨桥面系的振动特性。计算结果表明:采用单轴和双轴移动车辆模型计算出的桥面系振动特性差别不大;不同车速的移动车辆荷载引起桥面系的振动响应不同,车速快时,桥面系竖向振动的最大位移减小,竖向振动的最大速度和加速度增加。
Taking the 110 m self-anchored CFST truss arch bridge of a main span as an example, the free vibration characteristics of the bridge and the vibration characteristics of the main span deck under load of moving vehicles are analyzed. The calculation results show that the vibration characteristics of the bridge deck system calculated by the uniaxial and biaxial moving vehicle models have little difference; the vibration response of the bridge deck system caused by the moving vehicle loads with different speeds is different; when the vehicle speed is fast, the bridge deck system vibrates vertically The maximum displacement decreases, the maximum speed and acceleration of vertical vibration increase.