| Reinforced concrete structure is widely used in the field of construction engineering.However,due to the corrosion of steel bars,the structure is damaged prematurely.FRP reinforced concrete structure can effectively solve this problem,but the ductility of FRP reinforced concrete structure is poor and its ability to resist earthquake action is weak.Steel glass fiber reinforced polymer(SGFCB)is a kind of composite reinforcement material,which is made of ordinary steel bars as inner core and wrapped with glass fiber(GFRP)externally.It has the characteristics of high strength,good ductility and strong corrosion resistance.SGFCB can not only effectively solve the corrosion problem,but also make the structure have good seismic performance.At present,the research on SGFCB is limited to beam and column members.In this paper,SGFCB is used in shear wall by reasonable design,which not only keeps good lateral force resistance,but also solves the problem of insufficient durability of reinforced concrete shear wall in corrosive environment.In this paper,four SGFCB shear walls and one SGFCB shear wall were designed.The failure mechanism and seismic performance of SGFCB shear walls under the influence of different steel fiber ratio,axial compression ratio and GFRP stirrup ratio were studied.The calculation formula of bending capacity was put forward.It provides a theoretical basis for the application of SGFCB shear wall in practical engineering.The main research contents are as follows:(1)Four specimens of SGFCB shear wall and one specimen of ordinary reinforced concrete shear wall were tested under low cyclic horizontal load.The deformation of shear wall at the critical moment such as cracking,yield,peak value,limit and so on is investigated.The development of crack,failure process and form of specimen during loading are described in detail.The failure mechanism and failure mode are studied to verify the feasibility and reliability of SGFCB shear wall proposed in this paper.(2)Based on the comparison of steel fiber ratio,axial compression ratio and stirrup ratio between the two parameter levels,the test load displacement hysteretic curve and skeleton curve are analyzed.The seismic performance of SGFCB shear wall is studied from the aspects of strength,rigidity,ductility deformation and energy dissipation capacity,and the stress development of longitudinal reinforcement and stirrup of each test piece under different lateral displacement levels is evaluated.The section strain of each test piece is obtained Cloth.The results are compared with the experimental results of reinforced concrete shear wall.(3)Based on the constitutive model of sea sand concrete and SGFCB,this paper analyzes the bending mechanism of SGFCB shear wall,deduces the calculation formula of the bending capacity of SGFCB shear wall,and makes a comparative analysis with the test results. |
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