OMA of GFRP Retrofitted Model Concrete Structure Using Ambient Vibration

Nowadays, there are a great number of various structures that have been retrofitted by using different FRP Composites AFRP, BFRP, CFRP, GFRP, etc. Due to this, more researches need to be conducted to know more the dynamic characteristics of these structures, not only that but also a comparison among them before and after the retrofitting is needed. In this study, a model concrete structure is tested using ambient vibration data, in order to get the dynamic behaviors. Slab of the model concrete structure are then retrofitted by using GFRP composite, and then tested by using the ambient vibration data. At this stage, it is needed to evaluate the dynamic behaviors frequencies, mode shapes and damping ratios of the retrofitted model concrete structure. Various types of methods of OMA, such as FDD, EFDD, SSI, etc. are used to take action in the ambient responses. 

Having a purpose to learn more about the effects of FRP composite, experimental model analysis of both types retrofitted and no-retrofitted models is conducted to evaluate their dynamic behaviors. There is a provision of ambient excitation to the structure by using ambient vibration data on ground level. Furthermore, the Enhanced Frequency Domain Decomposition is used through output-only modal identification. At the end of this study, moderate correlation is obtained between mode shapes, periods and damping ratios. The aim of this research is to show and determine the effects of GFRP Composite implementation on structural responses of the model concrete structure, in terms of changing its dynamical behaviors. The frequencies for model concrete structure and the retrofitted model concrete structure are shown to be 11.41 in average difference. Finally, it is shown that, in order to evaluate the period and rigidity of retrofitted structures, OMA might be used. 

by Sertaç Tuhta "OMA of GFRP Retrofitted Model Concrete Structure Using Ambient Vibration" 

Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-1 , December 2018, 

URL: http://www.ijtsrd.com/papers/ijtsrd18979.pdf

Direct Link: http://www.ijtsrd.com/engineering/civil-engineering/18979/oma-of-gfrp-retrofitted-model-concrete-structure-using-ambient-vibration/serta%C3%83%C2%A7-tuhta

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