摘要
以广州地铁6号线高架3×36 m连续刚构桥梁为基本实例,通过动力学有限元分析程序MSC.DYTRAN建立了车桥耦合分析模型;通过大量的参数分析,在一定范围内总结了连续刚构桥梁结构参数变化以及车速变化,对结构动力系数、车体竖向加速度的影响;研究结果表明:对于广州地铁6号线采用的3跨连续刚构桥梁而言,结构边跨跨中动力系数随着主梁线刚度的增大,呈增大的变化趋势;车速是影响结构动力系数变化的主要因素之一,当列车轮对的加载频率与结构的1阶竖向自振频率接近时,动力系数明显增大,并且随着车速提高,动力系数总体呈增大的趋势;车体竖向加速度随着主梁线刚度增大而减小,而随着车速的提高而增大。
Taking the typical three-span continuous rigid-framed bridge with each span of 36 m in Guangzhou as research object,a spatial model about coupled vibration between the train and the bridge is built by means of program.Diversification rules of impact factor and vertical acceleration are summarized by analyzing a large quantity of structure parameters and vehicle moving speed.The results indicate that impact factor in the middle of side span is larger than any other locations and by the increasing of beam rigidity and pier rigidity the impact factor is increased.Vehicle moving speed is one of the most important influence factors to the responses of bridge and vehicle.Impact factor increases distinctly when loading frequency approaches to the first vertical natural frequency.Vehicle vertical acceleration is reduced by the increasing of beam vertical rigidity and is increased by the elevating of vehicle velocity.
出处
《石家庄铁道大学学报（自然科学版）》
2012年第1期14-19,38,共7页
Journal of Shijiazhuang Tiedao University(Natural Science Edition)
关键词
轨道交通
连续刚构桥
耦合振动
动力系数
railway transportation
rigid-framed bridge
coupling vibration
impact factor
