模拟环境激励下钢管混凝土拱桥模态分析

Modal analysis on steel tube concrete arch bridge under environment excitation

针对一钢管混凝土拱桥,通过白噪声信号模拟环境激励,结合随机子空间法获得拱桥模态参数,并和峰值法进行对比,说明环境激励下随机子空间法不仅能识别出结构的模态频率和阻尼比,也能准确提取结构的模态振型,适合大型复杂结构的模态分析。

According to a steel tube concrete arch bridge, through the white noise signal simulation environment excitation, combining with sto- chastic subspace method gained arch bridge modal parameters, and contrasted to peak value method, explained that the stochastic subspace method under environment excitation could only identify the structural modal frequencies and damping ratios, but also accurately extract the structure modal vibration mode, suitable for modal analysis on large complex structure.