吊杆损伤对钢管混凝土拱桥动力特性的影响

Influence of Suspender Damage on Dynamic Property of CFST Arch Bridge

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。

According to the structural characteristics of the Yellow River bridge on Beijing - HK - Macao expressway, the spatial finite element model on the main bridge is established by using software ANSYS. The dynamic properties of the bridge with different suspender damages are calculated and analyzed. The analysis result shows that （1） the damaged suspenders have little influence on the bridge＇s low order vibration frequencies, while have more influence on the bridge＇s high order vibration frequencies; （2） the damaged suspenders have little influence on the bridge＇s transverse vibration frequencies, while have more influence on the bridge＇s vertical, torsional and deck transverse vibrations; （3） the second order and deck transverse vibrations of the bridge are relatively sensitive to suspender operation safety, the working comparing the deviation of the damage condition of the suspenders should measured values of natural vibration Thus, in order to ensure the bridge＇s be judged comprehensively not only by frequency corresponding to the values in health state, but also by combining with other suspender damage detection technology.