悬索桥用新型摩擦阻尼器的研发及试验研究
Development and Experimental Study of Friction Dampers for Suspension Bridges
徐源庆 1季卫红 2王志强 1白晓宇1
作者信息
- 1. 中交公路长大桥建设国家工程研究中心有限公司 北京市 100088
- 2. 中交公路规划设计院有限公司 北京市 100010
- 折叠
摘要
针对大跨径悬索桥在运营荷载下梁端往复运动、累积位移大,导致滑动支座和伸缩缝因磨耗严重而耐久性降低的问题,研发了一种抑制或降低悬索桥主梁慢速频繁运动的摩擦阻尼器.对比分析了黄铜、复合型刹车片、高性能聚合物等摩擦材料样件的耐磨特性,以高性能聚合物和不锈钢镜面作为摩擦副设计试制了大吨位摩擦阻尼器试件,并完成了力学性能试验.研究结果表明,在12 MPa的正压力下,黄铜、复合型刹车片材料的磨耗率高且稳定性差,而高性能聚合物材料经过10 000 m磨耗后仅出现少量磨屑,且对磨面未出现明显磨痕,磨耗率为12 μm/km,耐磨特性良好,摩擦力稳定;高性能聚合物在0.5～11 mm/s范围内摩擦系数随速度变化幅度小,其平均值为0.174,稳定性较好;摩擦阻尼器试件在0.1～377 mm/s范围内,实际阻尼力与设计值(752 kN)的偏差均不大于±10％,呈现明显的库伦特性,在悬索桥不同受力状态下均能提供较稳定的阻尼力.
Abstract
The beam end of large-span suspension bridges occurrence frequent reciprocating motion under operating loads,the durability of sliding bearings and expansion joints is reduced due to severe wear and tear.In response to the above problem,the friction damper for the suspension bridges is developed.In order to select suitable wear-resistant friction materials for friction dampers,the wear resistance characteristics of friction material samples are compared and analyzed such as brass,composite brake pads,and high-performance polymers.Large tonnage friction damper specimens using high-performance polymers and stainless steel mirror surfaces as friction pairs are further designed and produced,and mechanical performance tests are carried out.The research results show that,under a positive pressure of 12 MPa,the wear rate of brass and composite brake pad materials is high and the stability is poor,while high-performance polymer materials only show a small amount of debris after 10 000 meters of wear,and there are no obvious wear marks on the worn surface,with a wear rate of 12 μm/km,with good wear resistance;The friction coefficient of high-performance polymers varies slightly with speed within the range of 0.5～11 mm/s,with an average value of 0.174,indicating good stability;The friction damper specimen exhibits obvious Coulomb characteristics within the range of 0.1～377 mm/s,and the deviation between the actual damping force and the design value(752 kN)is not greater than±10％,which can provide relatively stable damping force under different stress states of the suspension bridge.
关键词
桥梁工程/悬索桥/主梁累积位移/摩擦阻尼器/高性能聚合物/耐磨性/试验研究Key words
bridge engineering/suspension bridge/main beam cumulative displacement/friction damper/high performance polymer/wear-resistance/experimental study引用本文复制引用
出版年
2024
NETL
NSTL
万方数据