轻轨桥梁高墩结构动载试验与振动特性分析

摘要

以某城市的跨座式单轨交通桥梁为工程实例，通过对其高墩结构进行振动特性试验，并基于有限元理论对高墩结构进行分析计算。结合实测数据，采用信号处理分析中的方法FFT变换和HHT变换进行试验结果分析，以此分析高墩结构的振动特性，并对比两种方法的分析结果，发现HHT变换分析方法优于FFT变换。通过实测值与理论值对比分析，发现高墩结构基频实测值高于理论值，表明高墩结构的实际刚度大于理论结果。通过对高墩结构的振动特性进行分析，表明高墩结构动力性能良好，能满足规范及运营要求。%With reference to a straddle-type monorail transportation bridge, experimental investigation and finite element analysis on vibration characteristics of high piers are performed. Results from FFT and HHT are applied to analyze the vibration characteristics of high piers based on test data respectively. The results show that HHT is better than FFT in signal processing and analyzing. The comparison of the calculated results with the measured data shows that the practical rigidity is greater than theoretical one. The analysis of the vibration characteristics of the high piers indicates that their dynamic performances are good and satisfy the specifications and operating requirements.