Abstract
On the basis of the thought that the minimum system realization plays the role as a coagulator of structural information and contains abundant information on the structure, this paper proposes a new method, which combines minimum system realization and sensitivity analysis, for structural damage detection. The structural damage detection procedure consists of three steps: (1) identifying the minimum system realization matrixes A, B, and R using the structural response data; (2) defining the mode vector, which is based on minimum system realization matrix, by introducing the concept of the measurement; (3) identifying the location and severity of the damage step by step by continuously rotating the mode vector. The proposed method was verified through a five-floor frame model. As demonstrated by numerical simulation, the proposed method based on the combination of the minimum realization system and sensitivity analysis is effective for the damage detection of frame structure. This method not only can detect the damage and quantify the damage severity, but also is not sensitive to the noise.
Highlights
As our economy enjoys a rapid growth and engineering construction technologies become mature increasingly, the number of high-rise buildings and long-span structures has been increasing
Structural health monitoring can be considered as synonymous to damage detection, it refers to a much broader research and application area that can be employed for different purposes, such as validation of the properties of new structure, life cycle performance of structure, and structural control
The concept of measurement is introduced and the mode vector which characterizes structural information based on the minimum system realization matrix was defined, and the sensitivity theory was applied to detect structural damage step by step by continuously rotating the mode vector
Summary
As our economy enjoys a rapid growth and engineering construction technologies become mature increasingly, the number of high-rise buildings and long-span structures has been increasing Because all of these structures are landmark of the city where they are located, the damage or collapse will cause great losses of properties and lives. Speaking, all of these methods select a mathematical model that can precisely and concisely describe the structure and achieve the structural dynamic characteristics parameters through specific transformations, so as to detect structural damage. This process which gradually condenses extracts and purifies information shows certain disadvantages. The proposed method was verified by a five-floor frame model
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