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索力测试的精度和实用性直接影响大跨度张弦梁结构健康监测的应用.针对多撑杆的张弦梁结构索段约束复杂和索力识别精度等问题,采用一种新的索力识别方法——半波法对索力进行识别.通过对张弦梁模型的试验研究,证明了半波法在张弦梁下弦拉索中进行索力测试的可行性.在两撑杆张弦梁缩尺模型的中间跨布置传感器,通过人工激励局部索的振动来测量高阶振型半波长,利用简支单索模型识别整体张弦梁的拉索索力,对高阶振型的测量可以得到更精确的拉索索力.试验结果表明,利用半波法对张弦梁拉索进行索力测试是可行的,当测出4阶及以上振型时,可以得到更精确的索力.
The accuracy and practicability of the cable force test directly affect the application of the health monitoring of the long-span beam string structures.Aiming at the complicated constraint of the cable sections and the accuracy of cable force identification of the multi-stringer beam structure, a new cable force identification method Wave method to identify the cable force.Through the experimental study on the beam string model, it is proved that the half-wave method is feasible in the cable tension test of the string cable under the string beam.With the sensor installed in the middle span of the two strut beam model, Artificial excitation of local cable vibration to measure the high-order mode of the half-wavelength, the use of simple supported single cable model to identify the overall tension of the cable tension of the beam, the higher-order mode can be measured more accurate cable force.The test results show that the use of half-wave method Stringent beam cable for cable testing is feasible, when measured 4 and above mode, you can get more accurate cable force.