Experimental Research on Dynamic Properties of CFRP Reinforced Concrete Frame Structures

Through similarity analysis, the 1:4 scale model of CFRP (carbon fiber reinforced plastics) reinforced concrete frame structure was designed and manufactured, and the dynamic test of simulated seismic shaking table was carried out. Unidirectional, bidirectional and tridirectional seismic excitation was applied to test the dynamic characteristics of the structural model. The seismic performance of the CFRP reinforced concrete frame structure was investigated by analyzing the dynamic response and hysteretic performance of the structure under different levels of earthquake, such as acceleration, displacement and internal force. The results showed that with the enhancement of seismic excitation, the natural vibration period of the structure kept getting longer increasing 54% in the X direction and 60% in the Y direction from seven-degree to eight-degree earthquake action, indicating that the structural model had been damaged to varying degrees, resulting in continuous degradation of structural stiffness, increasing deformation and partial concrete crushing failure. However, the structure model still did not collapse after experiencing the rarely accurred earthquake with the peak acceleration of 0.788 g, and the maximum inter-storey displacement angle was less than 1/50, indicating that the structure model had good seismic performance and could meet the seismic fortifying level requirements of "not bad in small earthquakes, repairable in medium earthquakes, and not falling in large earthquakes".