【摘要】 将HHT引入国道104发生严重火灾的桥梁的损伤诊断,通过对提取的响应信号进行HHT分析判定出该桥第4跨发生损伤,与实测结果相吻合,证明了该方法在桥梁健康监测方面应用的可行性,同时与FFT计算结果进行了对比,可以发现通过HHT分析后得到的Hilbert谱能够清晰的反映出结构振动能量随振动频率和时间的分布情况,而且整个过程都是自适应的,优于FFT,同时,HHT可以比FFT更清晰的判断桥梁结构动力响应的频谱特性。更多还原

【Abstract】 The Hilbert-Huang Transform(HHT) method was introduced for damage detection of a bridge after fire accident on national trunk No.104.By analysing the extracted response signals using HHT method,it is identified that the injury occurred on the fourth span,which is in line with the measured result.It is shown that the presented method is feasible in bridge health monitoring.Compared with the calculation result of FFT method,it is shown that(1) the Hilbert spectrum from HHT method can clearly reflect the distribution of the structural vibration energy with frequency and time;(2) the whole process is adaptive and its analyzed result is better than that of FFT method;(3) HHT can determine the dynamic response spectral characteristics of the bridge structures more clearly than FFT does.更多还原