摘要
文中从公轨合建大跨长联桥梁结构特点出发,推荐采用具有双向隔震功能的位移型减隔震支座方案,尤以高承载力的双曲面摩擦摆减隔震支座最合适。通过对双曲面摩擦摆减隔震支座参数分析,提出采用上限和下限不同隔震状态确定控制区域范围进行减隔震设计。同时对于采用双曲面球型摩擦摆减隔震支座的公轨合建桥梁,需要考虑支座附加变形影响,开展车桥耦合振动分析,减隔震支座附加变形对车辆竖向加速度指标影响较大,应重点关注。
Starting from the structural characteristics of long span bridges built on road-cum-rail,the use of displacement type seismic isolation bearings with bidirectional isolation function is recommended,especially the hyperbolic friction pendulum seismic isolation bearing with high bearing capacity.By analyzing the parameters of the hyperbolic friction pendulum isolation bearing,it is proposed to use different isolation states of upper and lower limits to determine the control area range for isolation design.At the same time,for highway and railway joint bridges using hyperbolic spherical friction pendulum isolation bearings,it is necessary to consider the impact of additional deformation of the bearings and conduct vehicle bridge coupling vibration analysis.The additional deformation of the isolation bearings has a significant impact on the vertical acceleration index of vehicles,and should be given special attention.
作者
苗润池
魏标
何友娣
MIAO Runchi;WEI Biao;HE Youdi(National Engineering Research Center of High-speed Railway Construction Technology,Changsha 410075,China;China Railway Group Limited,Beijing 100039,China)
出处
《交通科技》
2024年第1期67-70,共4页
Transportation Science & Technology
基金
中国中铁股份有限公司科技研究开发计划项目(2020-重点-02)资助。
关键词
公轨合建
大跨长联桥梁
减隔震支座
减隔震设计
车-桥耦合振动分析
road and rail joint construction
long span and long connected bridges
seismic isolation bearings
seismic isolation design
vehicle bridge coupling vibration analysis
