斜靠式拱桥振动特性分析
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摘要
以拉萨市柳梧大桥主桥为工程背景,采用有限元软件MIDAS/Civil建立空间有限元计算模型,分别对其动力特性、地震响应、副拱倾角变化对结构性能的影响进行分析。计算结果表明:该桥的低阶振型以桥面系的横弯为主,桥面系横向刚度较弱;地震波单向输入和三维输入时,主副拱各控制截面内力的变化规律和影响程度不同;副拱倾角增大可显著提高结构的横向刚度,能减小拱肋面外弯矩和拱顶横向位移,而对主拱轴力影响相对较小。
Taking Liu-Wu Bridge in Lhasa as the research project,the finite element model of the bridge was established by using the software MIDAS/Civil.The dynamic characteristics,seismic response and vice arch inclination change were analyzed,in order to study the performances of the structure.The results show that the low-order mode shapes of the bridge is mainly the transverse bending of the deck,the lateral stiffness of the deck is weaker; when the waves are inputted in one direction and three dimension,the change rules and influence degree are different in the internal forces for each control section of the lord vice arch.The enlargement of vice arch inclination angle significantly improves the lateral stiffness of structure,and decreases the bending moment of arch rib as well as the lateral displacement of the arch top.But it has little impact on the internal forces of the main arch.
Taking Liu-Wu Bridge in Lhasa as the research project,the finite element model of the bridge was established by using the software MIDAS/Civil.The dynamic characteristics,seismic response and vice arch inclination change were analyzed,in order to study the performances of the structure.The results show that the low-order mode shapes of the bridge is mainly the transverse bending of the deck,the lateral stiffness of the deck is weaker; when the waves are inputted in one direction and three dimension,the change rules and influence degree are different in the internal forces for each control section of the lord vice arch.The enlargement of vice arch inclination angle significantly improves the lateral stiffness of structure,and decreases the bending moment of arch rib as well as the lateral displacement of the arch top.But it has little impact on the internal forces of the main arch.
引文
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[8]刘爱荣,禹奇才,宋瑞,等.地震作用下斜靠式拱桥的动力稳定性[J].深圳大学学报:理工版,2010,27(3):286-289.Liu Airong,Yu Qicai,Song Rui,et al.Dynamic stability of leaning-type arch bridge under earthquake[J].Journal of Shenzhen University:Science and Engineering,2010,27(3):286-289.
[2]肖汝诚,孙海涛,贾丽君,等.昆山玉峰大桥——首座大跨度无推力斜靠式拱桥的设计研究[J].土木工程学报,2005,38(1):78-83.Xiao Rucheng,Sun Haitao,Jia Lijun,et al.Kunshan Yufeng bridge design of the first long span leaning-type arch bridge without thrust[J].China Civil Engineering Journal,2005,38(1):78-83.
[3]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 Zhehui,Hu Feng,et al.Study on dynamic characteristics of leaning-type arch bridge[J].Journal of Zhengzhou University:Engineering Science,2005,26(4):25-28.
[4]钟轶峰,殷学纲,陈淮.斜靠式异型拱桥体系振动特性分析[J].桥梁建设,2005,2:8-11.Zhong Yifeng,Yin Xuegang,Chen Huai.Analysis of vibration characteristics of leaning-type irregular-shape arch bridge system[J].Bridge Construction,2005,2:8-11.
[5]陈淮,孙应桃.斜靠式拱桥拱肋倾角变化对稳定性能的影响[J].铁道科学与工程学报,2009,6(1):21-24.Chen Huai,Sun Yingtao.Variation sloping angle of arch rib influenced on the stability of double X-shaped arch bridge[J].Journal of Railway Science and Engineering,2009,6(1):21-24.
[6]李莹.斜靠式梁拱组合体系桥梁设计理论研究[D].上海:同济大学,2006.Li Ying.Research on Design Theory of Leaning-Type Arch Bridge System[D].Shanghai:Tongji University,2006.
[7]刘爱荣,禹奇才,张俊平,等.斜拱肋倾角变化对斜靠式拱桥地震响应的影响[J].暨南大学学报:自然科学版,2010,31(3):270-273.Liu Airong,Yu Qicai,Zhang Junping,et al.Influence of variation of incline angle of inclined arch rib on the seismic response of leaning-type arch bridge[J].Journal of Jinan University:Nature Science,2010,31(3):270-273.
[8]刘爱荣,禹奇才,宋瑞,等.地震作用下斜靠式拱桥的动力稳定性[J].深圳大学学报:理工版,2010,27(3):286-289.Liu Airong,Yu Qicai,Song Rui,et al.Dynamic stability of leaning-type arch bridge under earthquake[J].Journal of Shenzhen University:Science and Engineering,2010,27(3):286-289.
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