Abstract
Structural damage detection by nondestructive methods is highly desirable. Changes in modal parameters such as frequency, damping, and mode shape are particularly inviting. Evidence is presented here that reveals that static deflection can, in many cases, be a more sensitive predictor of structural damage than frequency. The reasons for this are illuminated within, and hinge on very fundamental issues about the very nature of structural response. Furthermore, static deflection measurements are often easier to make, with higher levels of accuracy than dynamic measurements. Comparisons are made between theoretical models and experimental results for simple structures, with extensions given to more complex structures.
Highlights
There is currently great interest in nondestructive methods for use in structural damage detection
Change in dynamic response, which may appear as changes in modal parameters like frequency, damping, and mode shape, is an inviting option
+ 1)/2; this is shown in the Appendix.) For purposes of calculating static deflection sensitivity, the equivalent spring constant is given by keq = k12
Summary
There is currently great interest in nondestructive methods for use in structural damage detection. We show that in many cases, static deflection shows significantly greater sensitivity to local damage than does frequency. The beam was an 457 mm (18 in.) long by 13 mm (0.5 in.) square steel beam, damaged by a saw cut approximately 14% in from one end.] For this simple structure, static deflection was considerably more sensitive to damage than fundamental frequency.
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