从制动试验的位移反应分析桥墩的制动力

Calculation of braking force on piers by using displacement response record obtained from braking test

为了探索车辆制动对桥墩的影响 ,一般可以通过桥梁的制动试验测量桥墩的位移反应进行分析。问题是通常采用的位移测振仪所记录的制动反应 ,其初始波形有畸变现象 ,这一现象严重地影响了分析的准确性。为此 ,本文根据位移测振仪的工作原理 ,分析这一畸变现象发生的原因和修正方法 ,恰当地解决了这一令人困惑的问题。同时 ,结合结构的振动特征 ,准确地分析了作用于桥墩的制动力大小。文中还列举了几个计算实例 ,可供工程应用参考。

To ascertain the influence of traffic braking on the piers, we measured the displacement responses of piers through the braking test and completed the analysis of record. In the analysis we found there exists the distortion of the wave form in initial part of the record obtained from the vibrometer. This distortion will bring serious effect on exactitute of the analysis. In this paper, the reason why the distortion appears is analyzed and the method to adjust it is suggested, based on the working principle of the vibrometer. Furthermore, the braking force applied on the piers is exactly calculated. Numerical examples are also presented in this paper for reference.