大跨度系杆拱桥柔性吊杆张力监测和参数识别研究

研究了基于弦振动理论应用频率法进行大跨度系杆拱桥柔性吊杆张力测试的基本方法,尤其是对影响频率法测定吊杆张力精度的若干参数,如吊杆的边界条件、减振阻尼器及有效计算长度等进行了较理想的识别。文中推导了张力测试的实用公式,并通过现场张力标定,对上述若干参数进行有效识别,提高了张力测试精度并减少了识别工作量。实测结果表明,根据文中提供的参数识别方法进行参数识别后所得到的吊杆张力计算值大部分具有较高的监测精度,可以满足施工和运营期间监测吊杆张力的需要。

Flexible Hanger Rods Tension Measurement and Parameter Identification in Large-span Tied Arch Bridge

The measurement method to check the flexible hanger rods tension in large-span tied arch bridge is studied with frequency method based on the principle of vibration of tension cable,especially the parameter identification of some factors such as boundary(condition,)oscillating damper and effective calculation length of hanger rods,which influence the measurement precision of tension in hanger rods,are made clearly as the main part.The research result shows that the above mentioned parameters could be identified effectively by testing the hanger rods force in-situ,so as to raise the measuring precision and working efficiency.The test practice indicates that the precision in flexible hanger rods force calculation,which is based on the identified parameters with the proposed identification method,can meet the needs of monitoring the force in hanger rods during the time of construction and operation of the bridge.