利用位移测量推估梁及桥梁动态应变的方法研究

Approach of Speculating the Dynamic Strain by Measuring Displacement

桥梁损伤检测是桥梁工程的一个重要课题。梁的应力应变参数与其刚度存在直接关系 ,因而应变模态测量可望用于桥梁损伤检测。动态应变测量可通过位移测量实现 ,但对位移传感器提出了特定的要求。对位移测量方法的误差分析表明传感器的相频一致性对测试精度有较大影响。在此分析基础上 ,利用特制的 DP传感器进行了工字钢梁的模拟实验 ,实验结果验证了测量方法的可行性。

Damage detection of bridges is an important task of bridge engineering.The stress and strain parameters of girder have direct relationship with its stiffness.So the strain information of bridges can be applied to damage detection.The strain measurement can be realized from the displacement measurement.But the sensor of displacement has some special request.Through the error analysis of the approach,the plase-frequency consistency of sensors is more important.Based on this,the simulation experiment was carried out and the DP sensor was used to detect the displacement.The result demonstrates the feasibility of the measurement method.