通过跳车法识别桥梁自振频率的修正计算法

Correction Calculation Method of Identifying Natural Frequency of Bridges by Vehicle Jolting

利用加载车辆的竖向冲击作用,激起桥梁的竖向振动,简称"跳车试验",这种方法在动力荷载试验中广泛使用。该试验方法起振能量大,并能得到较高质量的自振信号,因此分析精度也较高。但激振车辆附加质量对测试结果的真实存在难以避免的影响。根据动力学计算理论,提出一种新的方法来修正跳车法实测频率,以获取较准确的自振频率。通过对大量样本测值结果与采用文中方法所得到的修正值的对比分析,可以确定该方法的有效性。

Using loads vehicles＇ vertical shock effect,arouses the bridge the vertical vibration,the abbreviation ＂jump experiment＂,this method in dynamic load experiment widespread use.This testing method starting of oscillation energy is big,and can obtain the high quality self oscillation signal,therefore the analysis precision is also high.But the excitation vehicles associated mass to tests the influence which the result the real existence avoids with difficulty.According to dynamics computation theory,this article proposed one new method revises jumps off the law actual frequency,gains the accurate base frequency.Through to the massive samples measured that the value result with uses the corrected value contrastive analysis which this article method obtains,may determine this method the validity.