Abstract
Usage of FRP composites for the retrofitting purpose of the structures against the harmful effect of dynamic loads are gaining popularity, it is used in a wide variety of disciplines including civil engineering. Thus, there is a great need to study the behavior of FRP composites for strengthening purposes of structures using empirical methods. In this study, a bench-scale steel structure model was strengthened with CFRP composite and tested using operational modal analysis. To conduct operational modal analysis a bench-scale earthquake simulator and ambient vibration emulator were used. Same steel structure model was tested without strengthening procedure. Obtained dynamic responses (maximum-minimum displacements and accelerations before and after application of CFRP) of steel structure model have compared to each other. This study shows that floor displacements of the model have been decreased along the height of the structure up to 41.43 %. Therefore, the results of the experiment confirm the effectiveness CFRP composites for the strengthening of steel structures.
Highlights
Buildings located in seismically active regions are under high risk of severe damages caused by harmful earthquake loads
The FDD method relies on a frequency line of Fastest Fourier Transform (FFT) analysis, the precision of predicted natural frequency depends on the quality of FFT
This study indicates that the shake table test may be used to evaluate the displacement and acceleration of structures retrofitted by CFRP
Summary
Buildings located in seismically active regions are under high risk of severe damages caused by harmful earthquake loads. Considering the performance of such buildings under seismic occurrence, there is a great need to strengthen the columns even without changing their building masses. It can be achieved using FRP composites through certain strengthening procedure of members such as columns, beams, and slabs. These composites are much lighter than other construction materials such as concrete or steel alongside having high strength and durability. Usage of FRP composites for strengthening reinforced concrete structures showed that it could prevent the structure from severe bending and shearing It can improve the resistance and ductility of the structure against lateral loads
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