火炉子沟大桥动力特性分析

用有限元计算桥梁结构的前几阶固有频率和振型等模态参数,在此基础上进行现场动态测试,将动测信号进行频谱分析,可识别出桥梁结构的固有频率等参数.综合分析表明,该桥梁结构动力特性的计算值与动测识别值两者是一致的,因此,该大桥动力特性达到了设计要求.这种计算和现场测试相结合的方法,能可靠得到桥梁结构的动力特性,借此,可检验大桥的施工质量和确定大桥的实际承载能力.

Dynamic analysis for huoluzigou bridge

By meams of calculation of finite element method the natural frequencies and vibration modes of the bridge structure are gained.According to the result,a schema of on site dynamic measurement and test is determined,and the one is made on the spot.After vibration signal acquired,the modal parameters of the natrul frequencies etc.of actual bridge structure are analysed by the frequency analysis method.We compare with calculation result,the former is as good as the latter.Therefore,the dynamic character of the bridge is quatified.With the help of the data,bridge construction quality and its actual bearing capacity can be evaluated.