基于小波包分析的肋拱桥结构损伤状态研究  

STUDY ON DAMAGE STATE OF RIBBED ARCH BRIDGE USING WAVELET PACKET ANALYSIS

作　　者：范颖芳[1] 胡志强[2] 周晶[2] 张学志[3] 

机构地区：[1]大连海事大学道路与桥梁工程研究所,辽宁大连116026 [2]大连理工大学海岸与近海工程国家重点试验室,辽宁大连116024 [3]吉林省公路管理局,吉林长春130021

出　　处：《工程力学》2008年第5期182-188,共7页Engineering Mechanics

基　　金：国家自然科学基金资助重点项目(50439010);国家自然科学青年基金项目(50708010);辽宁省博士启动基金项目(1050259)

摘　　要：针对某服役四十余年的钢筋混凝土旧拱桥制作了有机玻璃缩尺模型,通过对拱肋截面发生不同程度损伤以及损伤修补后拱桥模型的动力试验研究,得到了各种损伤情况下结构的自振频率;利用小波包分析方法对不同损伤情况下拱桥结构的观测信号进行分析,通过对小波包分量能量的灵敏度分析,确定了结构异常状态的敏感特征。研究结果表明:小波包分量能量对拱桥结构拱肋的异常状态较为敏感,可以作为拱肋的损伤敏感特征对拱桥进行健康诊断。Based on an old reinforced concrete arch bridge, which has been in-service for about 40 years, a scaled one-span bridge model was fabricated with organic-glasses. Notches were made on the arch ribs to simulate the damage. Dynamic experiments were conducted on the undamaged and damaged models. Dynamic properties of the arch bridge were obtained. Wavelet packet analysis was utilized to identify the damage state of the arch bridge. It is discovered that the wavelet packet component energy is sensitive to the abnormal state of the arch structure. It can also be drawn that the wavelet component energy can be used as a damage index for the damage diagnosis of arch bridge.

关 键 词：肋拱桥 模型试验 损伤 频率 小波分析 小波包 

分 类 号：O448.222[理学—电磁学] O346.5[理学—物理]