【摘要】 目前车桥耦合振动的研究对参数的分析并不全面,而且多集中在单车辆模型.为了全面揭示了多车辆振动激励下参数变化对桥梁动态响应的影响,建立了系列弹簧-阻尼-质量系统的车辆与简支桥梁耦合振动的计算模型.详细讨论了车辆速度、车辆间距、质量比等参数变化对桥梁响应的影响.车辆速度和车辆间距对桥梁动态响应具有显著的影响,桥梁响应在共振速度附近同样具有放大效应.车辆间距与桥跨的比值在0.6左右桥梁的动态响应最小.车辆总质量和刚度的变化对桥梁动力放大系数的影响随速度而不同,但变化幅度并不明显.双轴车辆的桥梁动力放大系数比单轴车辆小.桥梁阻尼能够明显降低共振振幅,对于消振振幅的降低不明显.更多还原

【Abstract】 At present, the analysis of parameters in the study of vehicle-bridge coupling vibration is not comprehensive, and most of them focus on single vehicle models. In order to fully reveal the influence of parameter changes on bridge dynamic response under multi-vehicle vibration excitation, a series of spring-damping-mass system coupled vibration calculation model of vehicle and simply supported bridge was established. The influences of vehicle speed, vehicle spacing and mass ratio on bridge response were discussed. The results show that the vehicle speed and vehicle spacing have significant effects on the bridge dynamic response, and the bridge response also has amplification effect near the resonance speed. The ratio of vehicle spacing to bridge span is about 0.6, and the dynamic response of the bridge is the smallest. The influence of the change of vehicle total mass and stiffness on bridge dynamic amplification coefficient varies with speed, but the change range is not obvious. The bridge dynamic amplification factor of two-axle vehicles is smaller than that of single-axle vehicles. Bridge damping can obviously reduce resonance amplitude, but it is not obvious to reduce vibration damping amplitude.更多还原