论文部分内容阅读
以地震、列车荷载共同作用下的大跨桥梁为研究对象,基于有限元分析软件,建立了地震波斜入射下包括地基土体在内的车-桥耦合动力数值分析模型。通过改变地震波的入射角度及车速,对桥梁的动力响应进行了计算分析。结果表明,地震波入射角度对桥梁的动力响应有显著的影响,随着入射角度的增大,跨中竖向位移、速度都不断地增大;在地震作用下,列车速度对桥梁动力响应的影响相对较小,桥梁结构的动力响应并不总是随着列车运行速度的增加而增加,而是在某一速度达到最大;考虑土-结构动力相互作用(SSI)时,桥梁参考点处的竖向位移显著增大,而跨中弯矩有所减小。
Taking the long-span bridge under seismic load and train load as the research object, the numerical simulation model of vehicle-bridge coupling dynamic including the soil under seismic oblique loading is established based on the finite element analysis software. By changing the incident angle of seismic waves and vehicle speed, the dynamic response of the bridge is calculated and analyzed. The results show that the incident angle of seismic waves has a significant influence on the dynamic response of the bridge. As the incident angle increases, the displacement and velocity of the mid-span vertical increases continuously. The influence of train speed on the dynamic response of the bridge under earthquake Is relatively small, the dynamic response of bridge structure does not always increase with the increase of train running speed, but reaches the maximum at a certain speed. When considering the soil-structure dynamic interaction (SSI), the vertical Significantly increase the displacement, while the mid-span bending moment is reduced.