吊杆损伤对湛河斜靠式拱桥动力特性的影响
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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,采用M IDAS/C ivil有限元软件,建立了该桥的空间有限元计算模型,进行了不同吊杆损伤情况下的桥梁动力特性计算,通过对比桥梁在完好状态和不同吊杆损伤情况下的桥梁动力特性,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;主拱吊杆损伤比稳定拱吊杆损伤对该桥的自振频率影响大,跨中吊杆损伤比1/4跨处吊杆损伤对该桥自振频率影响大。计算结果对正确认识斜靠式拱桥在不同状态下的结构动力特征,合理评价桥梁运营阶段的健康状况提供了参考和基础性数据。
According to the structural characteristics of the main bridge of Zhanhe bridge-a double X-arch bridge across the Chengdong River in Pingdingshan City,the bridge's spatial finite element model is built by the software MIDAS/Civil.The bridge's dynamic properties under different damaged suspenders have been calculated.By comparing the bridge's dynamic properties in health state and with that in damaged suspender state,it can be concluded: The damaged suspenders have little influence on the bridge's low order natural frequencies totally,but have large influence on the bridge's vertical and torsional frequencies.So the suspender damage causes the X-arch bridge's vertical and torsional frequencies reduced.The main arch suspender damage has more influence on bridge's natural frequencies than the stable arch suspender damage,and the mid-span suspender damage has more influence than the one-quarter span suspender damage.These results provide a reference and basic data for understanding correctly the structural dynamic properties of double X-arch bridge in different suspender damage states and for reasonably evaluating its health status in operational phase.
According to the structural characteristics of the main bridge of Zhanhe bridge-a double X-arch bridge across the Chengdong River in Pingdingshan City,the bridge's spatial finite element model is built by the software MIDAS/Civil.The bridge's dynamic properties under different damaged suspenders have been calculated.By comparing the bridge's dynamic properties in health state and with that in damaged suspender state,it can be concluded: The damaged suspenders have little influence on the bridge's low order natural frequencies totally,but have large influence on the bridge's vertical and torsional frequencies.So the suspender damage causes the X-arch bridge's vertical and torsional frequencies reduced.The main arch suspender damage has more influence on bridge's natural frequencies than the stable arch suspender damage,and the mid-span suspender damage has more influence than the one-quarter span suspender damage.These results provide a reference and basic data for understanding correctly the structural dynamic properties of double X-arch bridge in different suspender damage states and for reasonably evaluating its health status in operational phase.
引文
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[6]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 Zengshou,Sun Zheng,CHENHuai.Dynamic analysis of the YellowRiver main bridge in Zhengzhou[J].World Earthquake Engineering,2003,19(3):129-133.
[7]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.Chen Huai,Wang Yan,Dong Jianhua,et al.Dynamic characteristics analysis of Kangfu concrete filled steel tubular arch bridge[J].WorldEarthquat Engineering,2003,19(4):51-56.
[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 Sujuan,et al.Dynamic characteristics analysis of Hanjiang northern bridge[J].Journal of Railway Science and En-gineering,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 Yingtao,Hu Feng.Effect of arch rib construction errors on mechanical properties of double X-shape arch bridge[J].BridgeConstruction,2007,(1):36-38.
[10]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.Sun Yingtao,Chen Huai,Yang Yaping,et al.Effect of arch rib sloping angle changes on dynamic performance of double X-shape arch bridge[J].World Bridges,2008,(1):46-49.
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