结构参数变化对斜靠式拱桥动力特性的影响
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摘要
以广东省潮州市韩江北桥主跨钢管混凝土斜靠式拱桥初步设计方案为对象,采用ANSYS有限元程序,并考虑边跨对主跨的弹性约束作用,建立了该中承式钢管混凝土斜靠式拱桥动力计算的整体空间有限元计算模型;探讨了14种不同工况条件对桥梁动力特性的影响。计算结果表明:该钢管混凝土斜靠式拱桥为柔性结构,桥梁的竖向刚度相对较强,而钢管混凝土拱肋的面外刚度相对较弱;V撑外端约束及系杆梁抗弯刚度的变化对该桥动力特性影响较小;稳定拱拱脚横向外移以及增加吊杆虽能增大该桥拱肋的横向面外刚度,但对全桥竖向及扭转刚度贡献不大;桥梁施工状态对该桥振型影响较大。
Hanjiang Northern Bridge is a concrete filled steel tubular(CFST) through leaning-type arch bridge in Chaozhou city of Guangdong Province.Regarding its main span as the research object,considering elastic restricted function of the border span to the main span,the finite element program ANSYS was used to establish a spatial finite element dynamic calculating model of it.14 operating-condition modes were considered in the finite element method(FEM) analysis process in order to analyze the influences of different modes on dynamic characteristics of the bridge.The calculation results indicate that the CFST leaning-type arch bridge is a flexible structure.The vertical rigidity of the bridge is stronger than the out-surface rigidity of concrete arch rib.Both the out constraint of V-type brace and the flexural rigidity of tie-beam influence dynamic characteristic of the bridge weakly.If increasing transverse displacement at the toe of stable arch or adding the suspender amount,the out-surface rigidity of the arch rib will be increased obviously but the vertical and torsional rigidity won't be changed greatly.The bridge construction status influences the vibration mode greatly.
Hanjiang Northern Bridge is a concrete filled steel tubular(CFST) through leaning-type arch bridge in Chaozhou city of Guangdong Province.Regarding its main span as the research object,considering elastic restricted function of the border span to the main span,the finite element program ANSYS was used to establish a spatial finite element dynamic calculating model of it.14 operating-condition modes were considered in the finite element method(FEM) analysis process in order to analyze the influences of different modes on dynamic characteristics of the bridge.The calculation results indicate that the CFST leaning-type arch bridge is a flexible structure.The vertical rigidity of the bridge is stronger than the out-surface rigidity of concrete arch rib.Both the out constraint of V-type brace and the flexural rigidity of tie-beam influence dynamic characteristic of the bridge weakly.If increasing transverse displacement at the toe of stable arch or adding the suspender amount,the out-surface rigidity of the arch rib will be increased obviously but the vertical and torsional rigidity won't be changed greatly.The bridge construction status influences the vibration mode greatly.
引文
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[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 Zhe-hui,HU Feng,et al.Study onDynamic Characteristics of Leaning-type Arch Bridge[J].Journal of Zhengzhou University:Engineering Sci-ence,2005,26(4):25-28.
[4]陈淮,张广坡,王艳,等.中、下承式拱桥自振特性分析[J].铁道科学与工程学报,2008,5(5):32-36.CHEN Huai,ZHANG Guang-po,WANG Yan,et al.Dynamic Property Analysis of Half-through and Bot-tom-through Arch Bridge[J].Journal of Rail way Sci-ence and Engineering,2008,5(5):32-36.
[5]李静斌,葛素娟,陈淮.5跨连续中承式钢管混凝土拱桥抗震性能分析[J].世界地震工程,2005,21(3):110-115.LI Jing-bin,GE Su-juan,CHEN Huai.Seismic BehaviorAnalysis of a 5-span Continuous Half-through CFSTArch Bridge[J].World Earthquake Engineering,2005,21(3):110-115.
[6]盛叶,陈宝春.钢管混凝土哑铃型梁试验[J].哈尔滨工业大学学报,2003,35(增):248-251.SHENG Ye,CHEN Bao-chun.Experi ment Research ofDumbbell Concrete-filled Steel Tube Beams[J].Journalof Harbin Institute of Technology,2003,35(S):248-251.
[7]CECS 28—90,钢管混凝土结构设计与施工规程[S].CECS 28—90,Specification for Design and Construc-tion of Concrete-filled Steel Tubular Structures[S].
[8]CLOUGH R W,PENZIEN J.Dynamics of Structures[M].2nd ed.Berkeley:Computers&Structures Inc,2004.
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