摘要
针对某3跨门式桥墩轨道交通曲线连续梁桥,采用其桥址《地震安全性评价报告》提供的3条地震动时程曲线,应用SAP2000有限元软件,分析未隔震和双曲面球型减隔震支座隔震条件下的罕遇地震响应,进行双曲面球型减隔震支座曲线连续梁桥的减隔震研究。研究结果表明,曲线连续梁桥各桥墩的内力响应受响应内力方向与地震动输入方向夹角的影响;仅固定墩切向隔震时,固定墩的切向内力大幅减少,弯矩和剪力分别减小约70%和50%,但各墩的径向内力均有增加,最大增幅约达10%,不能满足桥梁的抗震要求;固定墩切向和径向双向、滑动墩径向隔震时,固定墩的切向和径向内力均大幅减少,弯矩和剪力分别降低约73%和49%,同时各滑动墩的径向内力也大幅降低40%～60%,减震效果明显。
The FEA model of a 3-span rail transit curved continuous bridge with twin-legged portal pier is established by SAP2000. By using three earthquake time history waves provided by Seismic Safety Evalu- ation Report, the calculation of isolation and non-isolation seismic responses of curved continuous bridge with and without double spherical aseismic bearing under rarely-occurred earthquake is carried out. By comparison, the results show that the internal force responses of each pier of the curved continuous bridge are influenced by the angle between the response internal force direction and the earthquake input direc- tion. When using double spherical aseismic bearing on braking pier in tangential direction, the seismic re- sponses of the bending moment and the shearing force of braking pier in tangential direction decrease about 70% and 50% respectively while the seismic response of each pier in radial direction increases to a maxi- mum of 10%, which can＇t meet the seismic requirements of the bridge. When putting double spherical aseismic bearing on braking pier both in tangential and radial direction and on sliding pier in radial direc- tion, the internal forces of the bending moment and the shearing force of braking pier in tangential direc- tion decrease about 73% and 49% respectively, and the internal forces of each pier in radial direction de- crease about 40%-60% as well. It can be concluded that the isolation effect of the double spherical aseis- mic bearing is obvious.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2011年第3期47-51,共5页
China Railway Science
基金
铁道部科技研究开发计划项目(2008G028-C)
关键词
曲线连续梁桥
减震
隔震
双曲面球型减隔震支座
地震响应
有限元分析
Curved continuous bridge
Vibration absorption
Seismic isolation
Double spherical aseismicbearing
Seismic responses
Finite element analysis
