中、下承式拱桥自振特性分析
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摘要
以平行式、提篮式和斜靠式3种中、下承式混凝土拱桥为工程实例,采用有限元程序MIDAS/Civil建立桥梁空间有限元计算模型,对其进行自振特性分析,比较3种不同桥型自振特性的特点,计算结果表明:中、下承式混凝土拱桥的振型主要有拱肋面外横向振动、结构整体竖向振动和扭转振动,高阶振型才出现桥面系的横向振动;3种拱桥都是首先出现拱肋的面外横向振动,低阶振型均以拱肋面外横向振动为主,拱肋的横向自振频率小于竖向自振频率;斜靠式拱桥的振型密集,横向振动基频比平行式和提篮式拱桥的横向振动基频大;3种拱桥的竖向振动都表现为桥梁结构整体竖向振动;3种拱桥的扭转振动都出现较晚。
With the background of 3 kinds of half-through and bottom-through reinforced concrete arch bridges,MIDAS/civil finite element procedure was taken to establish the spatial finite element models to carry on the dynamic property analysis,and their dynamic characteristics were compared and analyzed.The computed results indicate that the vibrations of half-through and bottom-through reinforced concrete arch bridges mainly involve three types,i.e.,the arch ribs' transverse vibrations out of plane,the vertical vibrations of the whole bridge and torsional vibrations.The transverse vibrations of the bridge deck only appear in the higher sets of modes of vibration.The arch ribs' transverse vibration out of plane all happen in three kinds of bridge's vibration first,and this kind of vibrations play a dominant role in the lower sets of modes of vibration,the arch ribs' transverse natural frequency is smaller than its' vertical one;The vibration modes' range of double X-arch bridges is much more dense,and the Double X-shaped arch bridge' transverse natural basic frequency is larger than the other two kinds of arch bridges'.The vertical vibrations of the three kinds of arch bridges all appear as the whole vertical vibrations of the bridge.Three kinds of arch bridges' torsional vibrations all happen later.
With the background of 3 kinds of half-through and bottom-through reinforced concrete arch bridges,MIDAS/civil finite element procedure was taken to establish the spatial finite element models to carry on the dynamic property analysis,and their dynamic characteristics were compared and analyzed.The computed results indicate that the vibrations of half-through and bottom-through reinforced concrete arch bridges mainly involve three types,i.e.,the arch ribs' transverse vibrations out of plane,the vertical vibrations of the whole bridge and torsional vibrations.The transverse vibrations of the bridge deck only appear in the higher sets of modes of vibration.The arch ribs' transverse vibration out of plane all happen in three kinds of bridge's vibration first,and this kind of vibrations play a dominant role in the lower sets of modes of vibration,the arch ribs' transverse natural frequency is smaller than its' vertical one;The vibration modes' range of double X-arch bridges is much more dense,and the Double X-shaped arch bridge' transverse natural basic frequency is larger than the other two kinds of arch bridges'.The vertical vibrations of the three kinds of arch bridges all appear as the whole vertical vibrations of the bridge.Three kinds of arch bridges' torsional vibrations all happen later.
引文
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[2]程海根,强士中.钢管混凝土提篮拱动力特性分析[J].公路交通科技,2002,19(3):63-65.CHENG Hai-gen,QIANG Shi-zhong.Dynamic property analy-sis of concrete filled steel tubular(CFST)X arch bridges[J].Journal of Highway and Transportation Research and Develop-ment,2002,19(3):63-65.
[3]欧碧峰,赵灿晖,乐建平.大跨度钢管混凝土拱桥的动力特性分析[J].公路交通技术,2005(3):84-87.OU Bi-feng,ZHAO Can-hui,LE Jian-ping.Analysis of dy-namic characteristics of large span concrete-filled archbridges[J].Technology of Highway and Transport,2005(3):84-87.
[4]冯仲仁,李彩霞,吴刚刚.下承式钢管混凝土拱桥自振特性的有限元分析[J].武汉理工大学学报,2005,27(7):50-53.FENG Zhong-ren,LI Cai-xia,WU Gang-gang.Finite elementanalysis on through concrete-filled steel-tabular archbridge’s self-vibration characteristics[J].Journal of WuhanUniversity of Technology,2005,27(7):50-53.
[5]刘钊,李鹏,丁文胜.大跨度系杆拱桥的结构形式对动力特性及地震响应的影响探讨[J].现代交通技术,2005(4):30-33,75.LIU Zhao,LI Peng,DING Wen-sheng.Study on the influenceof structural formation to the dynamic characteristic and seis-mic response of tied-arch bridges[J].Modern TransportationTechnology,2005(4):30-33,75.
[6]陈淮,王艳,董建华,等.康富钢管混凝土拱桥振动特性分析[J].世界地震工程,2003,19(4):51-56.CHEN Huai,WANG yan,DONG Jian-hua,et al.Dynamic be-haviour analysis of Kangfu concrete filled steel tubular archbridge[J].World Earthquake Engineering,2003,19(4):51-56.
[7]陈淮,申哲会,胡锋,等.斜靠式拱桥动力特性研究[J].郑州大学学报:工学版,2005,26(4):25-28.CHEN Huai,SHEN Zhe-hui,FU Feng,et al.Study on dy-namic characteristics of leaning-type arch bridge[J].Journalof Zhengzhou University:Engineering Science,2005,26(4):25-28.
[8]陈淮,朱倩,葛素娟,等.韩江北桥主桥动力特性研究[J].铁道科学与工程学报,2005,2(5):28-31.CHEN Huai,ZHU Qian,GE Su-juan,et al.Dynamic charac-teristics analysis of Hanjiang Northern Bridge[J].Journal ofRailway Science and Engineering,2005,2(5):28-31.
[9]陈淮,孙应桃,胡锋.拱肋施工偏差对斜靠式拱桥力学性能的影响[J].桥梁建设,2007,(1):36-38.CHEN Huai,SUN Ying-tao,HU Feng.Effect of arch rib con-struction errors on mechanical properties of double X-Shapearch bridge[J].Bridge Construction,(1):36-38.
[10]孙增寿,孙征,陈淮.郑州黄河大桥主桥自振特性分析[J].世界地震工程,2003,19(3):129~133.SUN Zeng-shou,SUN Zheng,CHEN Huai.Dynamic analysisof the Yellow River main bridge in Zhengzhou[J].WorldEarthquake Engineering,2003,19(3):129-133.
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