近断层地震动下的高速铁路桥梁减震设计

发布时间：2018-06-28 20:17

本文选题：桥梁 + 近断层地震动　；参考：《中国铁道科学》2014年06期

【摘要】：在"功能分离"设计理念基础上,提出减震榫与拉索限位器组合的高速铁路桥梁减震方案,通过减震榫的屈服耗能作用减小桥梁的地震响应,通过拉索限位器控制减震榫的过大变形和防落梁,给出减震榫和拉索限位器在多遇地震、设计地震和罕遇地震下的设计准则和设计方法。以1座高速铁路连续梁桥为例,研究在具有向前方向性效应、滑冲效应和无速度脉冲效应的近断层地震动下,采用组合减震方案桥梁结构的抗震性能。结果表明:仅采用减震榫的桥梁在速度脉冲型近断层地震作用下可能因减震榫变形过大而不安全;加设拉索限位器后,能有效地控制减震榫的变形及墩梁的相对位移,起到了较好减震效果,其减震率在60%以上。
[Abstract]:On the basis of the design concept of "function separation", this paper puts forward the seismic absorption scheme of high-speed railway bridge combined with tenon and cable limiter. The seismic response of the bridge is reduced by the yield energy dissipation of the damping tenon. Through the cable limiter to control the excessive deformation of the dampening tenon and the anti-falling beam, the design criteria and design methods of the dampening tenon and cable limiter under the frequent earthquake, the design earthquake and the rare earthquake are given. Taking a continuous beam bridge of high speed railway as an example, the seismic behavior of bridge structure with combined shock absorption scheme under near-fault ground earthquake with forward directional effect, slip impact effect and no velocity pulse effect is studied. The results show that the bridge with only damping tenon may not be safe because of excessive deformation of damped tenon under the action of velocity pulse near fault earthquake, and the deformation of mortise and the relative displacement of pier beam can be effectively controlled by adding cable limiter. The results show that the damping rate is more than 60%.
【作者单位】：大连海事大学道路与桥梁工程研究所;辽宁省公路工程重点实验室;
【基金】：国家自然科学基金资助项目(51178071) 国家“九七三”计划项目(2011CB013605) 教育部新世纪优秀人才支持计划资助项目(NCET-12-0751) 中央高校基本科研业务费资助项目(3132013315,3132014073)
【分类号】：U448.13;U442.55

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