摘要
为了提高桥梁大吨位支座的抗震性能,提出采用铅芯叠层橡胶支座作为桥梁减隔震设计支座。本文以某大跨度桥梁主墩大吨位支座为例,利用有限元软件建立不同铅芯直径的减隔震叠层橡胶支座模型,分析不同铅芯直径对支座抗震性能影响。结果表明:各支座的荷载位移滞回曲线大致为饱满的梭形,与弹塑性耗能模型相符合;随着铅芯直径的增大,屈服荷载和峰值荷载也随之增大,但提升幅度呈现先上升后下降的变化趋势,其中铅芯直径80 mm的支座相较于铅芯直径60 mm的支座,平均峰值荷载增加了41.62%,铅芯直径100 mm的支座相较于铅芯直径80 mm的支座,平均峰值荷载增加了28.92%,说明适当增大铅芯直径能够延缓结构的破坏,具有更好的延性和变形能力。本研究成果可为桥梁支座设计提供参考。
In order to improve the seismic performance of large tonnage bridge supports,lead core laminated rubber supports are proposed as seismic isolation design supports for bridges.Taking the large tonnage support of the main pier of a long-span bridge as an example,the model of laminated rubber bearing with different lead core diameters is established by finite element software,and the influence of different lead core diameters on the seismic resistance of the bearing is analyzed.The results show that the load-displacement hysteresis curves of each support are roughly full and fusiform,which are in agreement with the elastic-plastic energy dissipation model.With the increase of lead core diameter,yield load and peak load also increase,but the increase amplitude shows a trend of first rising and then decreasing.Among them,the average peak load increases by 4162%when a support with a lead core diameter of 80 mm is compared with a support with a lead core diameter of 60 mm.The average peak load is increased by 28.92%,indicating that properly increasing the lead core diameter can delay the failure of the structure,and has better ductility and deformation ability.The research results can provide reference for bridge support design.
作者
张拥法
ZHANG Yongfa(China Railway 16th Bureau Group Co.Ltd.,Beijing 100020,China)
出处
《铁道建筑技术》
2025年第5期116-119,共4页
Railway Construction Technology
基金
中铁十六局集团有限公司科技研发计划项目(K2023-22B)。
关键词
减隔震
橡胶支座
抗震性能
铅芯直径
vibration reduction and isolation
rubber bearing
seismic performance
lead core diameter
作者简介
张拥法(1978-),男,天津人,高级工程师,主要从事公路桥梁、房建、市政工程施工相关工作,E-mail:286431384@qq.com。
