摘要
针对曲线桥梁在地震中因固定支座处及桥墩底部受力过大而破坏严重的现象,提出考虑支座摩擦滑移隔震的曲线桥梁抗震设计方法,通过大型振动台模型试验,研究曲线桥梁考虑支座摩擦滑移时的隔震机理。试验结果表明:支座摩擦滑移可有效减小地震作用下曲线桥梁的桥墩加速度响应,但同时会增加桥墩与梁体间的相对位移;曲线桥梁进行隔震设计后,桥墩的应变响应明显减小,证明该设计方法可有效避免地震作用下桥墩底部产生较大的损伤;最后,探讨了考虑支座摩擦滑移时曲线桥梁的隔震机理并与震害进行了对比验证。研究成果可为曲线桥梁的减震隔设计提供新的视角。
In view of the phenomenon that the irregular curve bridge is severely damaged due to excessive force at the fixed support and the bottom of the pier during the earthquake,this paper proposes an seismic design method for the irregular curve bridge considering the friction and slip isolation of the support.Through a large-scale shaking table model test,study the vibration isolation mechanism of the irregular curve bridge considering the friction and slip of bearings.The test results show that the frictional slip of the bearing can effectively reduce the acceleration response of the pier of the irregular curve bridge under the earthquake,but at the same time it will increase the relative displacement between the pier and the beam.After the vibration isolation design of the irregular curve bridge,the strain response of the pier is significantly reduced,which proves that the design method can effectively avoid large damage to the bottom of the pier under earthquake.Finally,the isolation mechanism of the curved bridge considering the friction and slip of the bearing is discussed and compared with the seismic damage.The research results can provide a new perspective for the design of seismic isolation of irregular curved bridges.
作者
闫磊
李果
岳克锋
安康
王心勇
尹修成
姜渝
YAN Lei;LI Guo;YUE Kefeng;AN Kang;WANG Xinyong;YIN Xiucheng;JIANG Yu(School of Civil Engineering, Chongqing Three Gorges University, Chongqing 404100, China;School of Civil Engineering, Chongqing Jiaotong University, Chongqing 400060, China)
出处
《世界地震工程》
CSCD
北大核心
2021年第1期86-92,共7页
World Earthquake Engineering
基金
中国博士后科学基金项目(2019M663442)
重庆市科委、教委项目(cstc2018jscx-msybX0167、KJQN201901219、KJQN202001216)
万州区科技创新项目(山区中小跨径梁桥震致安全保障关键技术研究与应用)
三峡水库岸坡与工程结构灾变防控工程技术研究中心开放基金(SXAPGC19ZDI01)
重庆三峡学院高等教育研究项目(GJ202002)。
关键词
曲线桥梁
摩擦滑移隔震
振动台试验
减震隔设计
curved bridge
friction slipping isolation
shaking table test
shock absorption design
