摘要
采用非线性弹簧单元模拟道床的纵向位移阻力关系,建立了地震作用下桥梁与轨道共同作用的线桥一体化模型,分析轨道约束对铁路桥梁纵向抗震性能的影响。研究表明,在地震中当桥墩刚度相近时,轨道约束对桥墩是有利的;当桥墩刚度相差较大时,轨道约束对刚度较大桥墩有时是不利的。文章还分析了道床阻力、桥梁跨数等因素对桥梁抗震的影响。
The railbridge model is established to analyze the effects of rail restraints on the longitudinal seismic response of railway bridges. The interaction between rails and bridges is modeled as nonlinear springs. It is shown that in the case of a bridge with piers of equal stiffness, the rails are beneficial to the bridge under earthquakes, but in the case of a bridge with piers of different stiffness, the rails are not beneficial to the stiffer piers under earthquakes. By considering the variation of longitudinal roadbed ultimate resistances and the number of bridge spans, the effects of rails on the seismic response of railway bridges are discussed in detail.
出处
《铁道学报》
EI
CAS
CSCD
北大核心
2002年第5期124-128,共5页
Journal of the China Railway Society
关键词
影响
铁路桥梁
轨道约束
纵向地震反应
railway bridges
rail restraints
longitudinal seismic response
