| Reinforced concrete structure is one of the most widely used structural forms in civil engineering.However,with the increasing influence of steel corrosion on the social economy,people began to seek a new type of corrosion-resistant material to replace steel in concrete structures.Because of its excellent properties,FRP bars are considered to be an ideal substitute for steel bars,and FRP bar concrete structures have gradually become a research hotspot in the field of civil engineering.In recent years,people have more and more in-depth research on the overall seismic performance and bearing capacity of FRP reinforced concrete structures,and performance-based design methods have gradually been applied to the design of FRP reinforced concrete structures.Carrying out shaking table test of FRP reinforced concrete frame structure,using the method of combining experimental research and theoretical analysis to conduct seismic performance research,and proposing feasible performance-based design methods,it is very necessary to promote the application of FRP reinforced concrete structure in engineering.In this paper,a 1/4-scale CFRP bar concrete frame model specimen was designed and produced,and the shaking table test was completed and nonlinear time-history analysis was performed to explore the seismic performance of the CFRP bar concrete frame structure;referring to the definition of the plastic hinge of the reinforced concrete structure,it is proposed The simplified calculation formula of the yield angle of FRP bar concrete members and the "plastic hinge" constitutive relationship of the FRP bar concrete structure are established,the finite element analysis model of the CFRP bar concrete structure is established,and the static elastoplastic research is carried out,and the performance-based FRP bar concrete is proposed Frame structure design method.The main research contents and results are as follows:(1)Based on the shaking table test of the 1/4-scale CFRP bar concrete frame model,the dynamic response and displacement response of the CFRP bar concrete structure model under the simulated earthquake action are explored.The test shows that the acceleration trend of each floor of the model structure is consistent,and the top acceleration peak value larger;the displacement between the bottom layers of the model structure is large,and the model stiffness degrades sharply when the acceleration is0.788 g.(2)Use SAP2000 to perform nonlinear time history analysis on the model structure,obtain the dynamic and displacement response of the model structure,and compare the results with the shaking table test results to verify the correctness of the finite element model.The analysis shows that the CFRP bar concrete structure basically meets the seismic fortification requirements,and it is completely feasible to use CFRP bar in the concrete structure.(3)With reference to the constitutive relationship of FRP bars,steel bars,and concrete,the moment curvature relationship of the FRP bar concrete section is deduced.The MATLAB program is used to solve the moment curvature curve,and the simplified calculation of the moment curvature of the FRP bar concrete section is carried out.Analysis;Based on the reasonable assumption of the yield point in the "plastic hinge" area,a simplified calculation formula for the yield angle of FRP reinforced concrete members is derived based on the principle of virtual work.(4)Based on the "plastic hinge" constitutive relationship model of FRP reinforced concrete members,the Push-over method is used to analyze the force and deformation capacity of the structure model at each stage,and the capacity spectrum method is used to evaluate the structure’s seismic resistance.The results show that the capacity curve of the CFRP reinforced concrete frame structure is higher than the seismic demand curve after reaching the performance point under the conditions of rare earthquakes of7 degrees and octaves,and the load-bearing capacity of the structure can meet the needs of 7 degrees and octaves earthquakes. |
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