Analytical, Numerical and Experimental Examination of Reinforced Composites Beams Covered with Carbon Fiber Reinforced PlasticIn the article, analytical, numerical (Finite Element Method) and experimental investigation results of beam that was strengthened with fiber reinforced plastic-FRP composite has been given as comparative, the effect of FRP wrapping number to the maximum load and moment capacity has been evaluated depending on this results. Carbon FRP qualitative dependences have been occurred between wrapping number and beam load and moment capacity for repair-strengthen the reinforced concrete beams with carbon fiber. Shown possibilities of application traditional known analysis programs, for the analysis of Carbon Fiber Reinforced Plastic (CFRP) strengthened structures.

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In this study, by using ambient vibration, a new approach based on improvement and correction of system characteristic matrix in modal vibration is provided. The result is that actual system characteristic matrices are accurately made such that the error is

In this research presented modelling, computing and application particularities of the structural aseismic control device which response redaction effect an average 61-79% relatively to conventional structure under earthquake excitation. For modelling mention device reinforce solid, structural solid, spring and contact finite elements was used. For contact element accepted conventional Coulomb frictional model. Governing non linier equation of motion is modelled as multidegree of freedom system with discontinuous and continuous models and solved adopting direct integration algorithm with coupling of the control system and system identification toolboxes. One of the very important earthquake action phenomenon-restoring force mechanism was found out, proved and it was used for modelling a novel no restoring mechanism aseismic passive control device. Investigated control device may be economically in the simple or small scale structures because have no any restoring mechanism.

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.