利用小波包分析古建筑结构损伤研究

Study on Damage of Ancient Building Structures Using Wavelet Packet Analysis

对古建筑结构的损伤进行有限元分析,提出随机激励作用下古建筑结构的小波包能量变化率指标。把古建筑结构梁上各节点的加速度响应信号进行小波包变换来进行损伤定位,该指标对于古建筑结构的损伤比较敏感,能准确判定古建筑结构的损伤位置,损伤程度越大,此指标越大。随后又提出损伤程度的判别方法并验算了其有效性,为研究环境激励下古建筑的损伤预警提供了理论依据。

Based on the finite element analysis of the damage of ancient building structures, this paper puts forward the wavelet packet energy change rate index of the ancient buildings under random excitation. The wavelet packet transform is taken for the each node＇s acceleration response signal of the ancient building structure beam to make a damage localization, whose index is sensitive for the ancient structural damage, can accurately determine the ancient building structure location, showing that the greater the extent of damage is, the greater the index is. Then, the method of judging the degree of damage is put forward and the validity of the method is checked, which provides a theoretical basis for the research on the early warning of the damage of the ancient buildings under the environment excitation.