重载铁路大跨刚构桥-轨道系统碰撞效应研究

发布时间：2018-05-16 15:51

本文选题：重载铁路 + 碰撞效应　；参考：《铁道科学与工程学报》2017年10期

【摘要】：为研究碰撞效应对重载铁路大跨连续刚构桥与轨道系统地震响应的影响,建立考虑碰撞的重载大跨连续刚构桥与轨道系统一体化仿真模型。以某4-32 m简支梁+(108+180+108)m连续刚构桥+4-32 m简支梁为例,研究碰撞效应对系统受力特性的影响,并探讨地震强度、碰撞单元刚度、梁端间距和小阻力扣件布置方案对碰撞效应和系统受力特性的影响。研究结果表明:钢轨地震应力最大值发生在简支梁与刚构桥交接处,刚构桥桥墩承受较大的墩顶水平力,考虑碰撞时的墩顶水平力最大值较忽略碰撞减少34.2%;增大地震强度,可显著增强碰撞效应,同时也使钢轨应力和墩顶水平力增大;增大碰撞单元刚度使梁体间的碰撞力增大,同时钢轨应力也有小幅度的减小;增大梁端间距使碰撞次数减小,但钢轨应力和墩顶水平力最大值均增大;布置小阻力扣件会减弱桥与轨道的非线性约束,碰撞效应加强,布置小阻力扣件路段的钢轨应力迅速减小,全线布置小阻力扣件较全线有砟轨道钢轨应力最大值减少了42.0%。
[Abstract]:In order to study the impact of collision effect on seismic response of long-span continuous rigid frame bridge and track system of heavy haul railway, an integrated simulation model of heavy-load long-span continuous rigid frame bridge and track system considering collision was established. Taking the 4-32 m simply supported beam of a 4-32 m simply supported beam as an example, the influence of collision effect on the mechanical characteristics of the system is studied, and the earthquake intensity and the stiffness of the collision element are discussed. The influence of beam end spacing and small resistance fastener arrangement on the impact effect and the mechanical characteristics of the system. The results show that the maximum seismic stress of rail occurs at the junction of simply supported beam and rigid frame bridge, and the pier of rigid frame bridge bears a large horizontal force at the top of the pier. At the same time, the rail stress and the horizontal force at the top of the pier are increased, the collision force between beams is increased and the rail stress is reduced by increasing the stiffness of the collision element, and the number of collisions is reduced by increasing the distance between the ends of the beam, and increasing the distance between the ends of the beam. However, the rail stress and the maximum horizontal force at the top of the pier are increased, and the nonlinear constraint between the bridge and the track is weakened by the arrangement of small resistance fasteners, and the impact effect is strengthened, and the rail stress of the section with the small resistance fasteners decreases rapidly. Compared with the maximum stress of rail in ballasted track, the stress of the whole line with small resistance fasteners is reduced by 42.0.
【作者单位】：中南大学土木工程学院;高速铁路建造技术国家工程实验室;
【基金】：高速铁路基础研究联合基金资助项目(U13342023) 中国铁路总公司科技研究开发计划项目(2015G001-G)
【分类号】：U442.55;U448.23

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