摘要
采用非线性时程分析法对某高速铁路三跨连续钢桁梁柔性拱桥进行地震响应分析,所涉参数包括墩底剪力、弯矩、拱脚轴力以及墩梁相对位移。结合结构特点,通过设置粘滞阻尼器来进行减震效果研究。对阻尼系数C和速度指数进行了参数敏感性分析,探讨了C和的合理取值。分析结果表明,通过设置粘滞阻尼器可以得到理想的减震效果,其中墩梁相对位移的减震率在65.0%以上,墩底最大弯矩减小了25.82%,拱脚最大轴力减小了28.78%。
The seismic response of a continuous steel truss girder with flexible arch is studied in this paper by using the nonlinear time history analysis method,which including the shear force,the bending moment at the bottom of piers,and the axial force of the arch,the relative displacement between superstructure and piers.Combined with the structural characteristics,the damping effect is studied after setting viscous dampers.The paramet-ric sensitivity of damping coefficient C and speed indexζare analyzed and the reasonable value of C andζare discussed.The analysis results show that the ideal damping effect is obtained after the viscous dampers are installed.The reduction of the relative displacement between superstructure and piers are above 65.0%.The maximal value of bending moment at the bottom of the pier and the axial force of the arch can decrease respectively by 25.82%and 28.78%.
作者
任玉鹏
蔺鹏臻
何志刚
Ren Yupeng;Lin Pengzhen;He Zhigang(The Headquarters of Yinwu Passenger Special Line,Lanzhou Railway Bureau,Yinchuan 750011,China;Civil engineering college,Lanzhou Jiaotong University,Lanzhou 730070,China)
基金
国家自然科学基金重大项目(11790281)
国家自然科学基金(51878323)
中国铁路总公司科技研究开发计划课题(2017G010-C)
关键词
高速铁路
非线性时程分析
钢桁梁柔性拱
地震响应
粘滞阻尼器
high-speed railway
nonlinear time history analysis
steel truss girder with flexible arch
seismic response
viscous damper
