摘要
平塘特大桥主桥为(249.5+550+550+249.5)m三塔双索面钢-混叠合梁斜拉桥。15号塔(边塔)、16号塔(中塔)、17号塔(边塔)分别高320,328,298m。该桥位于山区,桥址处为地震区,为了解地震作用对桥塔内力和桥塔、主梁位移的影响,采用SAP2000软件建立有限元模型,分别采用反应谱法和非线性时程分析法对其进行地震反应分析,并分析塔高差异对抗震性能的影响。结果表明:在地震作用下,中塔的塔底弯矩和塔顶位移大于边塔的塔底弯矩和塔顶位移;对于2座边塔,较高的15号塔的塔底弯矩及塔顶位移更大;主梁的纵向振动与横向振动基本不耦合,相对于纵向地震,主梁的竖向位移受横向地震的影响更大;2种方法的计算结果接近,但非线性时程分析考虑了支座的非线性,建议采用时程分析结果作为抗震设计的依据。
The main bridge of the Pingtang Bridge is a steel and concrete composite girder cable-stayed bridge with triple pylons,double cable planes and with span arrangement（249.5＋550＋550＋249.5）m.The pylons No.15（side pylon）,No.16（middle pylon）and No.17（side pylon）of the bridge are respectively 320,328 and 298mhigh.The bridge is located in the mountainous region and the site of the bridge is in the seismic area.To have an understanding of the influences of the seismic action on the internal forces of the pylons and on the displacement of the pylons and main girder,the software SAP2000 was used to establish the finite element model for the bridge,the seismic responses of the bridge were analyzed,respectively using the response spectrum method and the nonlinear time-history analysis method and the influences of the pylon height differences on the seismic performance of the bridge were analyzed as well.The results of the analysis demonstrate that under the seismic action,the bending moment of the footing and the displacement of the top of the middle pylon are greater than those of the side pylons.For the 2side pylons,the bending moment of the footing and the displacement of the top of the higher pylon No.15 are even greater.The longitudinal and transverse vibration of the main girder does not couple substantially and relatively to the longitudinal earthquake,the vertical displacement of the main girder is influenced by the transverse earthquake more greatly.The calculation results of the mentioned 2methods are close,but in the nonlinear time-history analysis method,the nonlinearity of the bearing is considered and it is hence proposed that the results of the nonlinear time-history analysis should be taken as the basis of the seismic design.
出处
《桥梁建设》
EI
CSCD
北大核心
2017年第1期76-81,共6页
Bridge Construction
基金
国家自然科学基金项目(51322808
51308549)~~
关键词
斜拉桥
山区
抗震性能
桥塔
主梁
有限元法
反应谱法
非线性时程分析法
cable-stayed bridge
mountainous region
seismic performance
pylon
main girder
finite element method
response spectrum method
nonlinear time-history analysis method
作者简介
何旭辉1975-,男,教授1996年毕业于长沙铁道学院桥梁工程专业,工学学士,2001年毕业于中南大学桥梁与隧道工程专业,工学硕士,2004年毕业于中南大学桥梁与隧道工程专业,工学博士.研究方向：桥梁抗风抗震与监测评估E-mail：xuhuihe@csu.edu.cn
盖永斌1993-,男,硕士生2014年毕业于中南大学土木工程专业,工学学士.研究方向：桥梁抗风抗震E-mail：gaiyongbin@csu.edu.cn
魏标1982-,男,副教授2004年毕业于东南大学土木工程专业,工学学士,2007年毕业于同济大学桥梁与隧道工程专业,工学硕士,2010年毕业于同济大学桥梁与隧道工程专业,工学博士.研究方向：桥梁抗震E-mail：weibiao@csu.edu.cn
杨健1973-,男,研究员1994年毕业于重庆交通大学桥梁工程专业,工学学士.研究方向：桥梁设计与研究E-mail：394570297@qq.com
