板式无砟轨道系统对不同抗震体系铁路桥梁纵向地震响应的影响

发布时间：2018-06-21 19:13

本文选题：铁路桥梁 + 地震反应　；参考：《中南大学学报(自然科学版)》2017年10期

【摘要】：以某高速铁路大跨度连续梁桥及32 m简支梁桥为研究对象,针对CRTSⅡ型板式无砟轨道体系的结构特点,建立考虑轨道体系纵向约束及摩擦效应的线桥一体化计算模型,对2种不同的抗震体系(延性抗震体系及减隔震体系)进行非线性地震响应分析。研究结果表明:在剪力齿槽弹性工作状态下,轨道体系纵向刚度约束效应对桥梁下部结构地震反应的影响显著,但摩擦效应影响较小,可忽略。桥梁采用的抗震体系不同,在地震作用下轨道系统及剪力齿槽的受力及分布规律也不同。建议强震作用下板式无砟轨道体系的受力分析应合理考虑桥梁不同抗震体系的受力特征。最邻近连续梁的一跨简支梁的剪力齿槽水平剪力远大于其他跨简支梁的剪力,建议该跨的剪力齿槽应加强设计,以避免在地震作用下由于该处剪力齿槽的受力失效导致其他各剪力齿槽的连锁破坏。
[Abstract]:Taking the long-span continuous beam bridge of a high speed railway and the 32 m simple supported beam bridge as the research object, aiming at the structural characteristics of the CRTS II slab ballastless track system, the integrated calculation model for the longitudinal and frictional effects of the track system is set up, and the nonlinear earthquake of the seismic system (ductile aseismic system and the seismic isolation system) is carried out for the 2 different seismic systems. The results show that the effect of the longitudinal stiffness constraint effect on the seismic response of the substructure of the bridge is significant, but the effect of the friction effect is small and negligible. The seismic system of the bridge is different, and the force and distribution of the rail system and the shear cogging are also under the earthquake action. It is suggested that the stress analysis of the slab ballastless track system under strong earthquake should consider the stress characteristics of the different seismic systems of the bridge. The shear cogging shear of one span simple beam with the nearest continuous beam is far greater than the shear of other simple beams. It is suggested that the cross shear cogging should be strengthened to avoid the earthquake action. The force failure of the shear groove causes the chain failure of the other shear cos.
【作者单位】：兰州交通大学土木工程学院;
【基金】：国家自然科学基金资助项目(51468031,51368034) 甘肃省科技计划项目(17JR5RA103)~~
【分类号】：U442.55

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