钢筋混凝土梁的损伤识别方法研究

介绍了一种利用动力实验检测桥梁破损的方法。该方法首先建立了钢筋混凝土梁的有限元计算模型，用以计算正常情况下梁的动力特性，其次通过在现场布拾振设备，采集实验数据，利用模态分析技术，获得病害桥墩的自振特性。再次，将无损模型分段，假设各段破损计算出自振特性，然后与实测结果比较，判断出损伤位置，根据系统动力方程，推导了破损因子，通过计算该因子，可以判断桥墩的破损位置和破损程度，最后，作者介绍了一个识别例子。

A New Approach to Damage Detection of Reinforced Concrete Beam

A new method to check bridge pier damage by dynamic experiment is introduced. First, a finite computing model is set up so as to calculate the dynamic property of the beam under normal conditions. Then, the vibration - picking devices are also built up on site to collect experimental data, and the model analysis is employed to gain natural oscillation performances of the beam. Third, the undamaged beam mode is separated. Suppose one part is damaged, its dynamic property should be calculated, and its dynamic property and the damage beam should be comparted to detect the location of the damage. Finally the authors illustrate the point by giving a damage detection example.