Application of Grey Control System Model In Structural Damage Identification

Development of construction health monitoring system becomes an important task for structure damage identification. Since the building structure has many indeterminable factors, the method using modal analysis to identify the structure damage is of less precision. A method applying the grey system to the structural damage identification was presented. The grey system of the frequency variance rate and the stiffness change was established with first-order single argument grey system(GM (1,1)). GM(1,1) prediction was used to reflect the global function of the structural dynamic fingerprints and the relation of the frequency variance rate and stiffness change was fond out. Vibration tests for frame structures were carried out, with considered many cases, including single-damage and multi-damage with different degrees and locations. The results show that for shear buildings, damage degree and location can be determined by using the grey system created through measuring frequency change.