高烈度区高墩连续刚构桥抗震性能研究  

Seismic Performance of Continuous Rigid Frame Bridge with High Piers in High-intensity Area

作　　者：杨哲 YANG Zhe(Bridge and Tunnel Research Institute(Department of Water Resources and Hydropower),China Railway First Survey and Design Institute Group Co.,Ltd.,Xi’an Shaanxi 710000,China)

机构地区：[1]中铁第一勘察设计院集团有限公司桥隧院(水利水电部),陕西西安710000

出　　处：《中国铁路》2024年第4期36-41,共6页China Railway

基　　金：中铁第一勘察设计院集团有限公司科研课题项目(院科20-33)。

摘　　要：以高烈度近场震区铁路桥为依托,采用Midascivil软件建立了不同墩高的桥梁结构力学模型,针对多遇地震及罕遇地震2种地震工况进行数值模拟,以桥墩高度为主要参数,以模型自振频率、桥墩墩顶、墩底位移及内力变化、阻尼器作用效果等方面对其抗震性能进行评价。研究结果表明:墩高增加时,桥梁整体的振型周期增大,对于多遇地震和罕遇地震无阻尼情况下墩底的弯矩纵横向弯矩变化幅度不大,而轴力增加明显;随着墩高增加,阻尼器对于桥墩墩顶墩底的弯矩减小比例较大,减震效果比较好。Relying on railway bridges in high-intensity near-field earthquake areas,the mechanical models of bridge structures with different pier heights are established by using Midas/Civil software.Numerical simulation is carried out for two seismic conditions:frequent and rare earthquakes.The pier height is taken as the main parameter to evaluate its seismic performance in terms of natural vibration frequency of the model,displacement and internal force changes at pier top and bottom,and damper effect.The study results show that when the pier height increases,the overall vibration mode period of the bridge increases accordingly.For frequent and rare earthquakes without damping,the longitudinal and transverse bending moment changes at the pier bottom are not significant,while the axial force increases significantly.With the increase of pier height,the ratio of the bending moment at the pier top and bottom by the damper decreases greatly,resulting in better seismic mitigation effect.

关 键 词：铁路桥梁 高烈度区 高墩 连续刚构 多遇 罕遇 减隔震 抗震性能 

分 类 号：U448.13[建筑科学—桥梁与隧道工程]