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随机振动法是检测斜拉索拉力的有效方法,采用经典谱估计的方法对数据进行处理,其精度会受到快速Fouri-er变换(FFT)栅栏效应的影响,为此采用离散时间序列Fourier变换(DTFT)方法实现对斜拉索固有频率的精确搜索,以提高随机振动法求解斜拉索拉力的精度。对塘沽海河斜拉桥拉索的振动数据进行处理以求解加载前后斜拉索的拉力,结果表明:DTFT方法比FFT法求解的精度提高了5%。
Stochastic vibration method is an effective method to detect the tensile force of stay cables. The precision of the data is affected by the fast Fouri-er transform (FFT) fence effect by using the classical spectral estimation method. For this purpose, the discrete time series Fourier transform DTFT) method to realize the accurate search of the natural frequency of stay cables to improve the accuracy of stochastic vibration method for solving the tension of stay cables. The vibration data of the cables of Tanghe Haihe cable-stayed bridge were processed to find the tensile force of the stay cables before and after loading. The results show that the accuracy of the DTFT method is improved by 5% compared with the FFT method.