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吊杆损伤对钢管混凝土拱桥动力特性的影响

, PP. 100-104

Keywords: 桥梁工程,吊杆损伤,有限元模型,钢管混凝土拱桥,动力特性,张力

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Abstract:

根据京港澳高速刘江黄河大桥的结构特点,基于有限元软件ANSYS建立主桥的空间有限元计算模型,对不同吊杆损伤情况下桥梁的动力特性进行了计算和分析。结果表明吊杆损伤对桥梁低阶振动频率影响较小,对高阶振动频率影响较大;吊杆损伤对桥梁横向振动影响较小,而对桥梁竖向振动、扭转振动和桥面横向振动影响较大;桥梁竖向第2阶和桥面横向振动对吊杆的损伤比较敏感。因此,应根据实测的桥梁自振频率值与桥梁健康状态下对应量的变化,再结合其他吊杆损伤检测技术,综合判别出吊杆的工作状态,保证桥梁的安全运营。

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