自锚式悬索桥动力特性及结构参数影响规律研究
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摘要
以浙江省江山市北关大桥———自锚式悬索桥为工程实例,利用大型通用有限元程序ANSYS建立空间有限元模型,并计算了前20阶频率及振型。然后具体探讨分析了恒载、加劲梁刚度、桥塔刚度等结构参数的变化对自锚式混凝土悬索桥动力特性的影响规律,同时对1座虚拟的相同跨径的地锚式悬索桥进行了对比分析,比较了这两类桥的动力特性,得到了一些有意义的结论,可为自锚式悬索桥的固有振动分析、抗风抗震设计提供参考依据。
By way of example of Beiguan Bridge, a concrete self-anchored suspension bridge to be built in Jiangshan, Zhejiang,the spatial finite element model for the type of the bridge is established, using the general program ANSYS, and the first 20 orders of vibration frequency and vibration modes of the bridge are calculated. The influences induced by variations of structural parameters, such as those of dead load, stiffening girder rigidity and tower rigidity, on the dynamic behavior of the bridge are then analyzed in a specific way. Meanwhile, a simulated suspension bridge having the same structural size, but anchored on the ground is analyzed for comparison purpose. The dynamic behavior of the two kinds of suspension bridges is compared, and some helpful conclusions are generalized, which provides reference to the analysis of the natural vibration, wind resistance design and aseismatic design of the concrete self-anchored suspension bridge.
By way of example of Beiguan Bridge, a concrete self-anchored suspension bridge to be built in Jiangshan, Zhejiang,the spatial finite element model for the type of the bridge is established, using the general program ANSYS, and the first 20 orders of vibration frequency and vibration modes of the bridge are calculated. The influences induced by variations of structural parameters, such as those of dead load, stiffening girder rigidity and tower rigidity, on the dynamic behavior of the bridge are then analyzed in a specific way. Meanwhile, a simulated suspension bridge having the same structural size, but anchored on the ground is analyzed for comparison purpose. The dynamic behavior of the two kinds of suspension bridges is compared, and some helpful conclusions are generalized, which provides reference to the analysis of the natural vibration, wind resistance design and aseismatic design of the concrete self-anchored suspension bridge.
引文
[1]杭州市城建设计研究院.江山市北关大桥工程扩大初步设计[R].杭州:杭州市城建设计研究院,2003.
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[5]丁皓江,何福保,谢贻权,等.弹性和塑性力学中的有限单元法[M].北京:机械工业出版社,1989.
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[2]范立础.桥梁抗震[M].上海:同济大学出版社,1997.
[3]ANSYS6.0中文手册[M].美国ANSYS公司.1999.
[4]铁道部大桥工程局桥梁科学研究所.悬索桥[M].北京:科学技术文献出版社,1996.
[5]丁皓江,何福保,谢贻权,等.弹性和塑性力学中的有限单元法[M].北京:机械工业出版社,1989.
[6][日]卢川隼人.振动分析的有限元法[M].北京:地震出版社,1985.
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