基于小波包能量统计方法的桥墩振动台试验分析

针对结构的加速度时程响应中包含的结构特性,同一结构的不同状态,以及小波包的能量不同分布信息,从小波包能量特征角度对结构的特性进行研究.以某钢筋混凝土桥墩振动台试验的一组加速度响应时程为研究对象,采用小波包分析方法对不同状态的小波包能量特征进行了统计分析,包括小波包能量均值、方差、标准差、相对平均偏差、相对标准偏差5个指标.经不同状态的各个指标分析结果表明:小波包能量均值指标表现出最佳的随加速度增加而结构响应逐步增大的变化规律;相同输入条件下,指标计算值受到结构动力特性和结构刚度分布特征的影响.

Shake Table Test Study of a Bridge Column Based on Statistical Wavelet Packet Energy Method

Considering that the acceleration time history response contains the structure characteristic information, and the wavelet packet energy distribution varies in different condition of the same structure, the characteristic information of the structure was excavated in the eyes of wavelet packet energy. Taking the serial acceleration time history response from shake table tests of a reinforced concrete bridge column as the object of study, the wavelet packet method was used to carry on the statistical analysis of the wavelet packet energy character of the different condition, including the mean, the variance, the standard deviation, the relative average deviation, and the relative standard deviation of wavelet packet energy. The results of different index indicate that the mean of wavelet packet energy can represent the rule that the structure response increases gradually with the increase of acceleration; the values of different index under the same conditions vary with the dynamic performance and stiffness distribution of structure.