Seismic Performance Analysis Of FRP Reinforced Concrete Frame With Finite Element

In recent years, many scholars study the mechanical properties, degeneration characteristicsand failure modes of the FRP bars reinforced concrete members, such as beams and columns,and the study on the overall performance of the frame is less. Basing on the previousresearches, this paper analyses the performance of AFRP reinforcement concrete frame, andthe finite element model is established to study the seismic performance of AFRP bar, CFRPbar and GFRP bar reinforced concrete frame, such as load-displacement hysteretic curve,skeleton curve, ductility performance, stiffness degradation, strength degradation andenergy-dissipating capacity. The main conclusion is as follows.Firstly, FRP bar has high strength and low young’s modulus compared with the steel bar, sounder the load, FRP bar reinforced concrete structures have high bearing capacity and largedeformation. When designing the FRP bar reinforced concrete frame, it is important toconsider the lateral and storey drift. Also in the design of FRP bar reinforced concretemembers, the crack and deflection are very important.Secondly, FRP bar is easy to damage, so it is better to install before construction, and thenlift to constructing platform. Generally, FRP bar diameter is small, so needs large number andbind densely when constructing, and it is easy to damage the bar when vibrating concrete, sohigh mobility concrete is a better choice.Thirdly, in the three types of FRP bars, the CFRP bar has highest elastic modulus and highstrength, AFRP bar is second, and GFRP bar is the minimum. So in the three types of FRP barreinforced concrete frame, the bearing capacity of CFRP reinforced concrete frame is thehighest, AFRP reinforced concrete frame is second, and GFRP reinforced concrete frame is theminimum.Fourthly, in the three types of frame, the AFRP bar reinforced concrete frame has the bestductility performance.Fifthly, CFRP bar reinforced concrete frame model has bigger stiffness than the othertwo models. Under the load, the stiffness degradation curves of three models are similar.When the load is small, the stiffness is big, and with the load increasing, the stiffness degrades.In the late loading, the concrete damage tends to be stable, and the stiffness of models degrades slowly.Sixth, AFRP bar and GFRP bar reinforced concrete frame models have similar strengthdegradation and energy-dissipating capacity，and it is better than that of CFRP bar model.