基于基频的尼尔森体系拱桥吊杆索力计算方法分析

Analysis of Calculation Method for Suspender Cable Force of Nielsen Arch Bridge Based on Fundamental Frequency

在已知吊杆振动基频的条件下,为获得准确的吊杆索力,通过在工程实例中进行分级张拉的方式,对已有的各种索力计算方法进行了验证分析.结果表明:文献[1]中给出的计算公式与分级张拉验证结果吻合较好;仪器厂家给出的公式忽略了吊杆抗弯刚度的影响,吻合度较差.对于旧桥索力检测,可不必对K值进行校正,直接采用文献[1]中给出的计算公式进行计算.

Under the condition of the known fundamental vibration frequency of the suspender,in order to obtain an accurate boom cable force,various existing cable force calculation methods through the method of graded tension in the engineering example are verified and analyzed.It can be known that the calculation formula given in the literature[1]is in good agreement with the results of the graded tension verification.The influence of the flexural rigidity of the suspender in the formula given by the instrument manufacturer is ignored,and the fit is poor.From the analysis results in this paper,for the old bridge cable force detection,it is not necessary to correct the K value,and directly use the calculation formula given in the literature[1]for calculation.