基于吊杆损伤的斜靠式拱桥动力特性分析
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摘要
根据平顶山市城东河路湛河桥主桥———斜靠式拱桥的结构特点,借助M IDAS/C ivil桥梁通用有限元程序,建立该桥的空间精细FEM,对不同吊杆损伤工况进行结构动力特性分析。通过与桥梁完好状态下的桥梁动力特性对比,可以得出结论:吊杆损伤对斜靠式拱桥的低阶自振频率总体影响较小,但对桥梁整体竖向自振频率和扭转自振频率相对影响较大,吊杆损伤导致桥梁竖向和扭转自振频率降低;主拱比稳定拱吊杆损伤对该桥的自振频率影响敏感,跨中比1/4跨处吊杆损伤对该桥自振频率影响大。
According to the structural characteristics of the main bridge of Zhanhe bridge,a double X-shape arch bridge,over Chengdong River in Pingdingshan City,the bridge's spatial mechanical computational FEM was erected by Finite element software MIDAS/Civil.By calculating and comparing the bridge's dynamic properties in the different degree damage of the suspender,it can be concluded that it has a slightly influence on the bridge's low order natural frequencies with the damages of suspenders,but has a great reduction on the frequencies of vertical and torque vibration.Compared with the damages of outboard suspenders,the damages of inside suspenders exert more influence on the bridge's natural frequencies;and by comparing with the damages of outboard suspenders in 1/4 span position,the damages of suspenders in span center have more influence on the bridge's natural frequencies.
According to the structural characteristics of the main bridge of Zhanhe bridge,a double X-shape arch bridge,over Chengdong River in Pingdingshan City,the bridge's spatial mechanical computational FEM was erected by Finite element software MIDAS/Civil.By calculating and comparing the bridge's dynamic properties in the different degree damage of the suspender,it can be concluded that it has a slightly influence on the bridge's low order natural frequencies with the damages of suspenders,but has a great reduction on the frequencies of vertical and torque vibration.Compared with the damages of outboard suspenders,the damages of inside suspenders exert more influence on the bridge's natural frequencies;and by comparing with the damages of outboard suspenders in 1/4 span position,the damages of suspenders in span center have more influence on the bridge's natural frequencies.
引文
[1]胡锋.斜靠式拱桥力学性能分析[D].郑州:郑州大学,2006.
[2]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.
[3]陈淮,王艳,董建华,等.康复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.
[4]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.
[5]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.
[6]孙应桃,陈淮,杨雅平,等.拱肋倾角变化对斜靠式拱桥动力性能的影响[J].世界桥梁,2008(1):46-49.
[7]陈淮,葛素娟.吊杆损伤对钢管混凝土拱桥自振特性影响的分析[J].桥梁建设,2008(4):24-26.
[2]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.
[3]陈淮,王艳,董建华,等.康复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.
[4]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.
[5]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.
[6]孙应桃,陈淮,杨雅平,等.拱肋倾角变化对斜靠式拱桥动力性能的影响[J].世界桥梁,2008(1):46-49.
[7]陈淮,葛素娟.吊杆损伤对钢管混凝土拱桥自振特性影响的分析[J].桥梁建设,2008(4):24-26.
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