VERIFICATION OF LOCAL DAMAGE DETECTION METHOD BASED ON FORCED VIBRATION TEST OF 5 STORY RC BUILDING WITH ARTIFICIAL SEISMIC DAMAGES

Wind tunnel tests have become one of the most effective ways to evaluate aerodynamics and aeroelasticity in bluff bodies. This paper has firstly overviewed the development of conventional wind tunnel test techniques, including high frequency base balance technique, static synchronous multi-pressure sensing system test technique and aeroelastic test, and summarized their advantages and shortcomings. Subsequently, two advanced test approaches, a forced vibration test technique and hybrid aeroelastic- force balance wind tunnel test technique have been comprehensively reviewed. Then the characteristics and calculation procedure of the conventional and advanced wind tunnel test techniques were discussed and summarized. The results indicated that the conventional wind tunnel test techniques ignored the effect of structural oscillation on the measured aerodynamics as the test model is rigid. A forced vibration test can include that effect. Unfortunately, a test model in a forced vibration test cannot respond like a structure in the real world; it only includes the effect of structural oscillation on the surrounding flow and cannot consider the feedback from the surrounding flow to the oscillation test model. A hybrid aeroelastic-pressure/force balance test technique that can observe unsteady aerodynamics of a test model during its aeroelastic oscillation completely takes the effect of structural oscillation into consideration and is, therefore, effective in evaluation of aerodynamics and aeroelasticity in bluff bodies. This paper has not only advanced our understanding for aerodynamics and aeroelasticity in bluff bodies, but also provided a new perspective for advanced wind tunnel test techniques that can be used for fundamental studies and engineering applications.

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Forced Vibration Test of a High-rise Building With Semi-active Switching Oil Damper

The Proceedings of the Symposium on the Motion and Vibration Control ◽

10.1299/jsmemovic.2003.8.370 ◽

2003 ◽

Vol 2003.8 (0) ◽

pp. 370-373

Author(s):

Kan SHIMIZU ◽

Haruhiko Kurino ◽

Jun Tagami

Keyword(s):

Forced Vibration ◽

Vibration Test ◽

High Rise ◽

High Rise Building ◽

Forced Vibration Test

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EXPERIMENTAL TESTS ON LOCAL DAMAGE DETECTION USING OPTICAL FBG SENSORS

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2015.53 ◽

2015 ◽

Vol 2 (1) ◽

Cited By ~ 1

Author(s):

Jin-Hak Yi

Keyword(s):

Damage Detection ◽

Environmental Effects ◽

Detection Method ◽

Principal Component ◽

Experimental Tests ◽

Scale Model ◽

External Loading ◽

Local Damage ◽

Offshore Structure ◽

Load Variations

In this study, the fiber Bragg grating (FBG)-sensor based local damage detection method is proposed under circumstances with temperature and external loading variations. To compensate the environmental effects, principal component analysis (PCA) is utilized and also the performance of PCA is compared with that of the conventional linear adaptive filter (LF) model. Laboratory tests with a 1/20 scale model of a jacket-type offshore structure with six jacket-legs and a heavy super structure have been carried out for investigating the performance of the proposed damage detection method. From the experimental tests, it is observed that the local damage feature is mostly hidden and difficult to identify due to the environmental effects. By utilizing the conventional LF and PCA models, the effects of the undesirable environmental effects can be efficiently eliminated, and it is also found that the performances of the LF and PCA models are very similar and competitive to each other. However PCA model does not require the information on the temperature and external load variations, hence it can be concluded that the PCA-based local damage detection can be more efficiently applied for FBG-based local damage detection under temperature and external loading variations.

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