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为了提取斜拉桥监测数据中的恒载索力,使用不同统计方法逐级剔除各类因素的影响.以南京长江三桥健康监测系统采集的索力传感器信息为依托,采用线性拟合剔除温度的影响;采用小波基函数为DB8的5级小波降噪方法剔除噪声信号;采用极值Ⅲ型分布拟合检验,取拟合的位置参数作为恒载索力.结果表明:索力和温度呈线性关系,有时温度效应较显著;噪声影响量较小;2007年交通状况下,车辆荷载影响量是温度影响量的2倍.多根拉索的计算结果验证了所提方法的可靠性和正确性.
In order to extract the cable force of the cable-stayed bridge under constant load, various statistical methods were used to eliminate the influence of various factors in a stepwise manner.Relying on the information of the cable force sensor collected by Nanjing Yangtze River Third Bridge Health Monitoring System, The noise signal was removed by using the five-level wavelet denoising method based on the wavelet basis function of DB 8. The extreme value Ⅲ distribution fitting test was adopted and the fitted position parameters were taken as the dead load force.The results showed that the cable force and temperature Linear relationship, and sometimes the temperature effect is more significant; the impact of noise is small; the impact of vehicle load is 2 times that of temperature in traffic conditions in 2007. The calculation results of multiple cables verify the reliability and correctness of the proposed method Sex.