摘要
为探讨高阶振型对大跨度钢桁拱桥地震反应的影响,以某1~490 m上承式钢桁拱桥为研究对象,采用MIDAS Civil软件建立全桥有限元模型,基于振型分解反应谱法基本原理,通过动力分析与静力分析相结合的方法,提出了高阶振型对大跨度钢桁拱桥地震反应的分离方法,在此基础上分析了主控振型对大跨度钢桁拱桥主拱圈纵向地震反应的影响规律。结果表明:同一振型对主桁下弦杆的同一位置不同内力分量的影响程度不同。同一振型对主桁下弦杆不同区域的同一内力分量的影响程度不同。从主桁下弦杆整体内力分布看,各阶振型对下弦杆的轴力、弯矩影响规律较为接近,但对剪力的影响明显不同。对于轴力和弯矩,在L/8区域~拱脚区域内,高阶振型的影响显著。对于剪力,在跨中区域~L/4区域,高阶振型的影响显著,且多阶振型共同作用效果明显。
Abstract
To study the effect of high-order modes on the seismic response of long-span steel truss arch bridges,a deck-type steel truss arch bridge with a span of 490 m was taken as the research object.By virtue of the software MIDAS Civil to build the finite element model of the whole bridge,based on the fundamental principle of mode analysis spectrum method,the separation method for the seismic response of the bridge with high-order modes was introduced by combinedly using the dynamic analysis and static analysis.On this basis,the influence of main control orders on the longitudinal seismic response of the main arch ring of the bridge was analyzed,and the seismic response mechanism was revealed.The results show that the influence of the same vibration mode on different internal force components at the same position of the chord bar under the main truss is different.The same vibration mode has different influence on the same internal force component in different areas of the chord under the main truss.Viewing the overall internal force distribution on the lower chord of the main truss,the influence of different modes on the axial force and bending moment on the lower chord is similar,but the influence on the shear force is obviously different.For the axial force and bending moment,in the region from L/8 to arch foot,the high-order vibration mode has a significant impact.For shear force,in the region from middle-span to L/4,the influence of high-order modes is significant,and the effect of multi-mode coaction is obvious.
关键词
大跨钢桁拱桥 /
地震反应 /
反应谱法 /
高阶振型 /
动力特性
{{custom_keyword}} /
Key words
long-span steel truss arch bridge /
seismic response /
response spectrum method /
high-order mode /
dynamic property
{{custom_keyword}} /
张永亮,冯鹏飞,陈兴冲,刘正楠,季日臣.
高阶振型对大跨度钢桁拱桥地震反应的影响[J]. 振动与冲击, 2020, 39(6): 225-229
ZHANG Yongliang, FENG Pengfei, CHEN Xingchong, LIU Zhengnan, JI Richen.
Influence of high-order modes on the seismic response of a long-span steel truss arch bridge[J]. Journal of Vibration and Shock, 2020, 39(6): 225-229
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
参考文献
[1] 范立础,胡世德,叶爱君.大跨度桥梁抗震设计[M].北京人民交通出版社,2001
Fan Li-chu,Hu Shi-de,Ye Ai-jun.Seismic Design of Long-span Bridges [M].Beijing People's Communications Press,2001(In Chinese)
[2] 范立础,桥梁抗震[M].同济大学出版社,1997
Fan Li-chu,bridge seismic [M].Tongji University press,1997(In Chinese)
[3] 陈代海,郭文华.大跨度钢桁架拱桥的空间地震响应分析[J].中南大学学报(自然科学版).2010(04)
CHEN Dai-hai,GUO Wen-hua,Spatial seismic response analysis of long-span steel truss arch bridge[J],Journal of Zhongnan University (Natural Science),2010(04) (In Chinese)
[4] 李建中,宋晓东,范立础.桥梁高墩位移延性能力的探讨[J].地震工程与工程振动,2005(01):43-48.
LI Jian-zhong,SONG Xiao-dong,FAN Li-chu.
Investigation for displacement ductility capacity of tall piers[J].Earthquake engineering and Engineering Vibration,2005(01):43-48.(In Chinese)
[5] 卢皓,管仲国,李建中.高阶振型对高墩桥梁抗震性能的影响及其识别[J].振动与冲击,2012,31(17): 81-85+98.
LU Hao,GUAN Zhong-guo,LI Jian-zhong.Effect of higher modal shapes on aseismic performanceof a
bridge with high piers and its identification[J].Journal of Vibration and Shock,2012,31(17):81-85+98.(In Chinese)
[6] 李宇,朱晞,杨庆山.多振型效应对铁路高柔桥墩弹塑性地震响应的影响[J].铁道学报,2011,33(11):99-105.
LI Yu,ZHU Xi,YANG Qing-shan.Effects of Multiple-mode Vibration on Elastic-plastic Seismic Responses of High Flexible Piers of Railway Bridge
[J].Journal of The ChinaRailway Society,2011,33(11):99-105.(In Chinese)
[7] TubaLdiE,TassotiL,DaLL'AstaA,etaL.Seismic response analysis of slender bridge piers[J].Earthquake Engineering &Structural Dynamics,2014,43(10): 1503.
[8] 陈旭,李建中,刘笑显.墩身高阶振型对高墩地震反应影响[J].同济大学学报(自然科学版),2017,45(02):159-166.
CHE Xu,LI Jian-zhong,LIU Xiao-xian.Seismic Performance of Tall Piers Influenced by Higher-mode
Effects of Piers[J].Journal of Tongji University (Natural Science),2017,45(02):159-166.(In Chinese)
[9] 邓育林,贾贤盛.大跨度悬索桥地震反应中高阶振型的影响分析[J].工程抗震与加固改造,2008(02): 24-28+81.
DENG Yu-lin,JIA Xian sheng.Effect of Higher Frequency Models of Vibration on Seismic Response of Long-span SuspensionBridge[J].Earthquake Resistant Engineering and Retrofitting,2008(02):24-28+81.
(In Chinese)
[10] 屈宏雅,徐艳,李建中.高塔斜拉桥纵桥向高阶振型影响分析[J].上海应用技术学院学报(自然科学版),2011,11(04):310-316+320.
QU Hong-ya,XU Yan,LI Jian-zhong.An Analysis of Longitudinal High-order Modes Effect on the Seismic
Responses of Cable-stayed Bridges with High -rise Toner[J].Journal of Shanghai Institute of Technology (Natural Science),2011,11(04):310-316+320.(In Chinese)
[11] 戴公连,汪禹.大跨度铁路连续梁拱组合桥梁地震响应特性[J].铁道科学与工程学报,2015,12(03):
557-563.
DAI Gong-lian,WANG Yu.Seismic response characteristics of long -span continuous beam -arch bridge[J].Journal of Railway Science and Engineering,2015,12(03): 557-563.(In Chinese)
[12] 李广慧,李小军,李胜利.中承式钢管混凝土拱桥的地震响应分析[J].应用基础与工程科学学报,2009,17(01):144-152.
LI Guang-hui,LI Xi-jun,LI Sheng-li.Seismic PerformanceAnalysisof A Large-span Half-throughArchBridgewithConcreteFiledSteelTubeRibs[J].
Journal of Basic Science and Engineering ,2009,17(01):144-152.(In Chinese)
[13] 夏超逸,钟铁毅.高速铁路南京大胜关长江大桥地震响应分析[J].中国铁道科学,2009,30(05):39-45.
XIA Chao-yi,ZHONG Tie-yi.Seismic Response Analysis on Nanjing DashengguanYangtze River Bridge of High-Speed Railway[J].Chinese Railway Science,2009,30(05):39-45.(In Chinese)
[14] 申现龙,陈永祁,刘荷,郑久建,张海江.Pushover方法在钢管混凝土拱桥抗震分析中应用[J].振动与冲击,2018,37(06):182-187+194.
SHEN Xian-long,CHEN Yong-qi,LIU He,ZHENG Jiu-jian,ZHANG Hai-jiang.Application of the Pushovermethodinthe seismic analysis of CFST arch bridge[J].Journal of Vibration and Shock,2018,37(06):182-187+194.(In Chinese)
[15] JTG/T B02-01-2008,公路桥梁抗震设计细则[S].北京:人民交通出版社,2008.
JTG/T B02-01-2008,Guidelines for Seismic Design of Highway Bridges[S].Beijing:People's Communications Press,2008.(In Chinese)
[16] Chopra A K. Dynamics of structures:theory and applications to earthquake engineering [M].Beijing:
High Education Press,2007.
[17] 王克海.桥梁抗震研究(第二版)[M].中国铁道出版社
Wang Ke-hai.Bridge seismic research (Second Edition) [M].China Railway Publishing House.(In Chinese)
{{custom_fnGroup.title_cn}}
脚注
{{custom_fn.content}}