【摘要】 本文分析地震作用对考虑土-结构相互作用的轻轨铁路车桥系统耦合振动的影响。文中建立了车桥系统考虑土-结构相互作用的三维空间模型,推导了考虑地震作用车桥系统的耦合振动方程,并编制了相应的计算程序。以时速100km的列车通过天津轻轨的一座四跨预应力混凝土连续刚构桥为例,对受天津波和E l Centro波地震作用的车桥系统的耦合振动响应进行了仿真分析。结果表明:地震作用下车桥系统的耦合振动响应近似为桥梁地震响应与车桥系统耦合振动响应之和;地震作用对车桥系统横桥向耦合振动响应的影响最大,对竖向耦合振动响应的影响较小,而对顺桥向耦合振动响应的影响甚微;且不同地震波激励的影响程度有所不同。由此得出结论,地震作用与车桥系统的耦合振动存在很大程度的耦合,因此,在对高架桥梁上的轻轨铁路进行车桥耦合振动分析时必须考虑地震作用的影响,以保证列车运行的安全性和稳定性。更多还原

【Abstract】 In this paper,the influence of seismic excitation on the coupled vibration of train-bridge system considering the soil-structure interaction in light railway is investigated,in which a 3-dimensional calculation model of the train-bridge system considering the soil-structure interaction is established.The equations of coupled vibration of the train-bridge system under earthquake excitations is deduced,and a corresponding computer program is generated.Taking a train with a velocity of 100 km/h through a 4-span continuous rigid-framed prestressed concrete bridge as an example,the coupled vibration responses of the train-bridge system under the excitations of Tianjin and El Centro ground motions are simulated.The results show that the coupled vibration responses of the train-bridge system induced by the seismic action may be taken as the sum of the seismic responses of the bridge and the coupled vibration responses of the train-bridge system approximately.The influence of seismic action on the coupled vibration responses in the lateral direction is maximum,and the level of the influence of different seismic excitations is much different.A conclusion is drawn that there is a rather large degree of coupling between the seismic excitation and the coupled vibration of the train-bridge system.Thus,the influence of seismic excitation must be considered in the analysis of the coupled vibration of train-bridge system in the light railway on the elevated bridge,so as to guarantee the safety and stability of running of the train.更多还原