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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。
Taking Chifeng Bridge in Chifeng, Inner Mongolia as an example, the bridge was completed in 2000 and was put into operation in August 2001. On the morning of December 13, 2001, an empty truck hit the ZN-54W boom From west to east No. 8 boom), resulting in severe damage to the lower section of the boom, the bridge for safety considerations, Songshan District, Chifeng City, the government proposed to test the bridge. In this paper, the finite element method, modal analysis and damage identification theory are used to conduct a comprehensive and systematic structural damage identification numerical simulation of the bridge, and compared with the experimental results. As the main load-bearing components of the arch bridge are the arch rib and the boom, this paper analyzes the dynamic characteristics of L / 2 section, L / 4 section and No. 8 boom under different damage degrees The dynamic characteristics of the whole structure are analyzed. The damage identification of the arch rib is realized by the variation of dynamic characteristics and strain mode. The damage identification of the boom is realized by the variation of dynamic characteristics and curvature mode.