Lateral Force-Displacement Calculation Model And Seismic Performance Evaluation Of High Performance Fiber Reinforced Concrete Energy Dissipation Wall-Reinforced Concrete Frame

Reinforced concrete(RC)frame structure is composed of beams and columns,its lateral stiffness and horizontal bearing capacity are small,and it is easy to cause serious damage under strong earthquake.High performance fiber reinforced concrete(HPFRC)materials have good tensile strain hardening and multi crack development performance,high deformation performance and energy dissipation capacity.The existing experimental research shows that HPFRC beams,columns,shear walls,frame joints and other components show superior seismic performance.Therefore,this paper proposes that HPFRC energy dissipation wall was assembled in RC frame as energy dissipation device to form a new seismic structure of HPFRC energy dissipation wall-RC frame.The assembly position of the energy dissipation wall corresponds to the infilled wall in the frame,which can appropriately improve the lateral stiffness and horizontal bearing capacity of the frame,and also can improve the ductility of the frame;when the frame structure bears the earthquake action,the HPFRC energy dissipation wall can consume part of the earthquake energy,so as to improve the seismic performance of the structure.In this paper,the specimens of HPFRC energy dissipation wall-RC frame were designed and manufactured,and its seismic performance test and theoretical analysis were carried out.On this basis,the dynamic elastoplastic analysis of HPFRC energy dissipation wall-RC frame structure under rare earthquake was constructed,and the seismic performance evaluation of this new structure was carried out.The main research contents and achievements are as follows:(1)Two specimens of HPFRC energy dissipation wall installed in single story and single span RC frame were designed and manufactured,one was installed with one HPFRC energy dissipation wall and the other was installed with two HPFRC energy dissipation walls.The failure process,failure mechanism,hysteretic performance,strength degradation,stiffness degradation and energy dissipation capacity of the two specimens were compared by quasi-static test.The results show that HPFRC energy dissipation wall can improve the ductility and energy dissipation capacity of the structure;Under the expected rare earthquake,HPFRC energy dissipation wall-RC frame structure only produces moderate damage;the horizontal bearing capacity of two energy dissipation walls assembled in the frame is increased by 38.3%,the initial lateral stiffness is increased by 1.78 times,but the elastoplastic lateral stiffness is only increased by20%～30%,the energy dissipation capacity is increased by 10%～175% with different damage forms,and the lateral deformation capacity is basically the same.(2)The calculation formulas of load at characteristic load point of HPFRC energy dissipation wall and RC frame were established respectively.Combined with the failure characteristics of the specimens,the calculation formulas of load at characteristic load point of HPFRC energy dissipation wall-RC frame structure were put forward.Through calculation and comparison,it was found that the calculation values of load at characteristic load point agree well with the test values,which indicates that the calculation of load at characteristic load point of HPFRC energy dissipation wall-RC frame structure proposed in this paper is reasonable.Based on the stiffness degradation law of RC frame and HPFRC energy dissipating wall,the effective lateral stiffness calculation method of HPFRC energy dissipation wall-RC frame structure was established.The research results show that the method basically reflects the stress and deformation characteristics of this structure,and the calculated value of structural lateral displacement by this method is basically consistent with the test value.Based on the quasi-static test of HPFRC energy dissipation wall-RC frame structure,a four fold restoring force model of HPFRC energy dissipation wall-RC frame structure was established by theoretical analysis and regression of test data,and the specific loading and unloading path was given,which provides reference for the dynamic elastoplastic analysis of this structure.(3)The finite element model of HPFRC energy dissipation wall-RC frame structure was established using ABAQUS software.The test process of the specimens was numerically simulated and compared with the test results to modify the relevant calculation parameters.On this basis,the influence of parameters(width-to-thickness ratio,aspect ratio,location of energy dissipation wall,HPFRC strength,reinforcement ratio of energy dissipation wall,etc.)on the seismic performance of HPFRC energy dissipation wall-RC frame structure was studied.The results show that the width-to-thickness ratio,the aspect ratio and location of HPFRC energy dissipation wall have great influence on the lateral stiffness,horizontal bearing capacity,deformation capacity,energy dissipation capacity of HPFRC energy dissipation wall-RC frame structure.The numerical simulation of RC frame with the same size and reinforcement shows that the bearing capacity and deformation capacity of RC frame is far less than that of HPFRC energy dissipation wall-RC frame,which shows that HPFRC energy dissipation wall can increase the lateral stiffness,horizontal bearing capacity,deformation capacity and energy dissipation capacity of this structure.(4)A five story RC frame structure was designed and constructed according to the current code of china,and optimize the structure after installing HPFRC energy dissipation wall.The dynamic elastoplastic analysis of HPFRC energy dissipation wall-RC frame structure was constructed using PERFORM-3D software,and studied the influence of HPFRC energy dissipation wall on the seismic performance of RC frame structure.The seismic fragility analysis of HPFRC energy dissipation wall-RC frame structure was carried out based on the incremental dynamic analysis method,and the probability of exceedance of HPFRC energy dissipation wall-RC frame under different performance levels were obtained.The results show that HPFRC energy dissipation wall can improve the seismic performance of RC frame structure,and its damage degree is relatively light under the earthquake,which can meet the seismic fortification requirements of the structure under the major earthquake.