摘要
以内蒙古赤峰市银河大桥为例进行研究,该桥于2000年竣工,2001年8月该桥正式投入运行,2001年12月13日早晨,一空载货车撞上ZN-54W吊杆(主拱桥由西向东第8号吊杆),造成吊杆下部保护套严重损伤,为大桥安全考虑,赤峰市松山区政府提出对该桥进行测试。本文采用有限元法、模态分析及损伤识别理论对该桥进行了全面系统的结构损伤识别数值仿真研究,并与试验结果进行比较。由于中承式拱桥的主要受力构件是拱肋及吊杆,所以本文分别分析了拱肋L/2截面、L/4截面及被撞的8号吊杆不同损伤程度下的动力特性,得出结构整体动力特性的变化规律,并通过动力特性变化规律及应变模态实现了对拱肋的损伤识别;通过动力特性变化规律及曲率模态实现了对吊杆的损伤识别。
The damage identification of Yinhe Bridges is mainly studied. This bridge was completed in 2000, in the morning of December 13, 2001, a truck bumps against No. 8 suspension rod of the bridge. Because the main working members are the rib arch and the suspension rod, the dynamic characteristics under different damage degree of L/2 across, L/4 across of the rib arch and bumped No. 8 suspension rod are analyzed,the changing regularization of the dynamic cl^aracteristics of whole structure is concluded and the damage identification to the rib arch is realized according to the dynamic characteristic changing and strain modal. The damage identification to the suspension rod is realized according to the dynamic characteristic changing and curvature modal.
出处
《公路》
北大核心
2006年第4期104-108,共5页
Highway
关键词
桥梁
动力特性
损伤识别
有限元法
模态分析
数值仿真
bridge
dynamic characteristics
damage identification
finite element method
modal analysis
numerical simulation
