介绍了动力特性测试基本原理、常用激振方法及钢管混凝土拱桥动力特性测试时传感器布置等方面的一些考虑,分析了环境随机激振法与自由衰减振动信号谱分析法的特点及异同,测试结果表明,自由衰减振动信号谱分析法可以更好的识别结构固有频率.
The fundamentals of the dynamic characteristics tests,the common excitation methods and some considerations about sensor placement in the dynamic characteristics tests of concrete filled steel tubular arch bridges are introduced.The peculiarities,similarities and differences between the ambient excitation and damped free vibration singal spectrum analysis are discussed.The results show that the damped free vibration singal spectrum analysis is more effective than the ambient excitation in identifying structural natural frequencies.