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以国内某新建大跨度钢拱桥吊杆为对象,研究了吊杆频率估算方法,并通过现场实测频率进行了分析与验证。对比研究了通过频率估算经验公式、有限元分析得到的吊杆频率的差异,通过环境激励和强迫振动激励下的现场试验获得了实桥吊杆的频率值,并基于实测结果考察了频率估算方法的准确性。发现采用整体有限元模型计算吊杆振动频率有较好的精度,并基于实测数据拟合给出了吊杆顺桥向与横桥向1阶弯曲频率估算的支撑条件系数和欧拉临界荷载修正系数。
Taking a newly built long-span steel arch bridge boom as an object, the method of estimating the boom frequency is studied and analyzed and verified by field measured frequency. The difference of boom frequency obtained by finite element analysis is compared with empirical formula of frequency estimation. The frequency of real boom boom is obtained through field test under environmental excitation and forced vibration excitation. The frequency estimation method is investigated based on the measured results Accuracy It is found that the overall finite element model is used to calculate the vibration frequency of the boom with better accuracy. Based on the measured data, the support condition coefficient and Euler critical load correction coefficient.