曲率模态识别桁架梁损伤位置方法研究

基于曲率模态识别结构损伤位置的方法具有测试简便，曲率对损伤的比较敏感等优点．详细说明了曲率模态识别损伤位置的具体方法：首先建立了桁架粱的有限元模型，用以计算正常情况下的动力特性：其次通过现场布拾振设备，采集实测数据，利用模态分析技术，获得实际结构的自振特性；再次将无损模型分段，假设某段破损，计算出自振特性，与实测结果相比较，从而判断出损失位置．最后作者介绍了一个识别例子．

Methods and Research of Damage Location of Truss Beam by Curvature Model

Truss beam damage demage detection based on curvature model exhibts a feature that curvature model of strucrure is sebsitive to damage of stucture.Detection process is that: first,a finite model is set up so as to calculate the dynamic property of the beam under normal condition.Then,the vibration-picking devices are built up on site to collect experimental data,and the model analysis is employed to gain natural oscillation performances of beam.Third,the undamaged beam model is separated.Suppose every part is damaged respectively,ots dynamic property should be calculated,and its dynamic property and the damage beam should be compared to detect the location of the damage.Finally the author illustrates the point by gibing a damage detection example.