CAJ | 학술논문

地震作用下大跨桥上无缝线路纵向响应的研究具有重要意义。以一座大跨桥梁为例，研究了一致激励下桥上无缝线路纵向地震响应，并对小阻力扣件铺设、梁体温差及地震波频谱特性对钢轨最大纵向力的影响进行了分析。得出结论：轨道约束对大跨桥梁结构的低阶纵向自振频率有较大的影响；地震作用下梁缝处钢轨最大纵向力比根据现有规范计算的钢轨最大伸缩力大很多，铁路工程相关规范应增加钢轨地震力检算这一指标；大跨桥上铺设小阻力扣件后，地震时钢轨最大纵向力会降低约20%~30%；穿越震区的大跨桥上无缝线路设计应合理考虑梁体温差的影响，并使桥梁结构低阶纵向自振频率有效避开场地处地震波的主频率段，否则地震发生时桥上无缝线路工作状态将会受到较大考验。
지진작용하대과교상무봉선로종향향응적연구구유중요의의。이일좌대과교량위례，연구료일치격려하교상무봉선로종향지진향응，병대소조력구건포설、량체온차급지진파빈보특성대강궤최대종향력적영향진행료분석。득출결론：궤도약속대대과교량결구적저계종향자진빈솔유교대적영향；지진작용하량봉처강궤최대종향력비근거현유규범계산적강궤최대신축력대흔다，철로공정상관규범응증가강궤지진력검산저일지표；대과교상포설소조력구건후，지진시강궤최대종향력회강저약20%~30%；천월진구적대과교상무봉선로설계응합리고필량체온차적영향，병사교량결구저계종향자진빈솔유효피개장지처지진파적주빈솔단，부칙지진발생시교상무봉선로공작상태장회수도교대고험。
Study on longitudinal seismic responses of CWRs(continuous welded rails)on large-span bridges is of great significance.Taking one large-span bridge as an example,longitudinal seismic responses of CWRs under uniform excitation were studied.Influence of laying of small resistance fasteners,beam temperature differences and seismic wave spectrum characteristics on the maximum CWRs longitudinal force was analysed.Results show as follows:Rail restraints have great influence on the low-order longitudinal natural frequencies of the large-span bridge structure;the maximum rail forces at beam joints under the action of earthquake motion are much larger than the maximum expansion forces calculated according to the current specifications,so the index of rail seismic force is suggested to be added to the related railway engineering specifications;in the case that small resistance fasteners are installed on large-span bridges,the maximum rail force will be decreased by 20%~30% in earthquake;CWRs design for large-span bridges located across earthquake zones should take beam temperature differences into rational consideration,and the low-order longitudinal natural frequencies of the bridge structures should be designed to avoid the main frequency bands of seismic waves on site,otherwise the working status of CWRs will be subj ected to severe tests when in case of earthquake.