STRUCTURAL DAMAGE IDENTIFICATION USING STATIC DEAD LOAD STRAIN MEASUREMENTS

Abstract eng:
A method has recently been developed for identifying damage in a structure that is based on the redistribution of dead load in the system. The static-based procedure uses only strain measurements at a few degrees of freedom (DOFs) and no additional external force is required. These features make the method ideally suited for long-term monitoring of large civil structures. Damage in the structure is represented by a section of reduced flexural rigidity. The identification problem is formulated as an optimization problem, which is solved using a float-representation genetic algorithm (FGA). The static flexibility-based error function is defined as the difference between the measured strains and the analytically predicted strains obtained from a finite element model. By minimizing the error function, the damage location and damage severity can be successfully identified. The method is demonstrated using two structures, a fixed-fixed beam and a simple frame. Results show that the procedure can correctly identify the damage with good accuracy, even in the presence of measurement noise.

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