应用灰色关联度分析检测结构损伤的位置和程度

开发结构健康监测系统是结构损伤识别的一个重要课题。由于建筑结构具有很多不确定因素,通过模 态分析识别结构损伤的精度很难保证。提出一种灰色关联度分析应用于结构损伤检测的数值方法。通过测量结构的频 率,建立可能损伤频率和实际损伤频率的关联度的关联序,并找出最优序列,逐次迭代逼近来确定结构的损伤位置和损 伤程度。对多种工况进行了框架结构模型的数值模拟。结果表明:对于层间剪切结构,通过测量结构频率变化运用本方 法可以准确地确定结构的损伤位置和损伤程度。

Application of Grey Incidence Analysis to Determine Degree and Location of Structural Damage

Development of health monitoring system has become an important task for structure damage identification. Since many indeterminate factors exist in the process of building structure damage detection, the method merely using modal analysis to identify damage is off predision A method applying the grey incidence analysis to structural damage identification is presented,which uses only frequency measurement to establish the order of grey incidence between the measured frequency and the frequency of possible damage, and to find out the optimun sequence, then by successive iteration to determine the degree and location of structure damage. Numetrical simulations for frame structures are carried, out in which many different cases are considered, including single-damage and multi-damage with different degrees and locations. The results show that for shear buildings, damage degree and location cam be clearly detemined.