Testing the vibration acceleration signal of rail top ( lateral and vertical ) , rail middle ( lateral ) , rail bed side ( vertical ) and rail bed middle ( vertical ) with dasp vibration testing system , calculation of signals obtains the power spectral density and frequency response curves of different position 测试横向和垂向激振力下钢轨不同部位的振动信号,进行频谱分析,得出不同部位的频率响应曲线。通过对频响曲线的分析,得出不同方向激振力下钢轨振动能量集中的频率,确定不同方向激振力下钢轨的主要振动部位和振动形式。
And , the structure weak - regions lie respectively in the transfer - floor , the vicinity of the 20th floor and the roof , which need to make the measure to avoid the structure plastic deformation under the action of stronger earthquake . ( 5 ) the vibration form appears the coupling of move and torsion , electing the first 15 modes to analyze can reflect accurately the actual load - function situation of the structure 转换层、 20层附近以及顶层为结构的薄弱层,需采取加强措施以防在强震下产生塑性变形。 ( 5 )本结构的振动形式表西安理工大学硕士学位论文现为平动与扭转的祸连,取结构的前巧阶振型作分析能够较精确的反应结构的实际受力状态。