| Shear wall structure system because of its lateral stiffness,good bearing capacity commonly used in China’s building high-rise,but with the country’s urbanization rate continues to rise,people also have higher requirements for the quality of housing class building.The more applied single-limb reinforced concrete shear wall structural system has the defect of only relying on the bottom of the wall limbs to resist seismic action,and the seismic protection mechanism is relatively single;the joint-limb shear wall structural system can use the coupling mechanism to form two seismic protection mechanisms,which has better performance in seismic resistance,but also has the shortcomings of complex construction,two walls must be coupled to achieve the coupling mechanism,and the actual coupling ratio is smaller than the design coupling ratio.In order to solve the shortage of one seismic defense line of single-limb shear wall structure system and the problems of joint-limb shear wall structure system,it is necessary to study a new shear wall structure system.In this paper,by reading a large amount of relevant literature,based on the ductility design method proposed by Zona et al.and referring to the Code for Design of Combined Structures,the American Code for Seismic Resistance of Steel Buildings and related literature,a (?)scale down 5-story steel edge column-plate concrete hybrid shear wall specimen with 45% coupling ratio was designed and fabricated.This new body introduces the coupling mechanism of the joint-limb shear wall system into the single-limb shear wall,which further expands the scope of application of the "joint-beam-wall-limb" coupling mechanism and has the advantages of simple design,easy construction,and the ability of single-limb shear wall.It has the advantages of simple design,convenient construction and two seismic protection mechanisms for joint-limb shear walls.In this paper,low circumferential reciprocal loading tests and finite element simulations are conducted to verify the seismic performance of the structure in terms of hysteresis curve,skeleton curve,stiffness degradation,ductility,damage characteristics,and steel strain.The experimental results show that the new system gives play to the coupling mechanism of the coupled shear wall and expands the range of the coupling mechanism of the single limb wall.When the specimen is damaged,the concrete at the bottom of the wall collapses,the steel beam on both sides suffers obvious shear deformation,and the longitudinal steel bar and the inner steel plate buckles.In the early stage,the specimen was mainly controlled by bending and subjected to the combined action of bending and shear in the middle and late stage.From the analysis of the measured data,it can be seen that the ductility coefficient of the specimen reaches 3.117,and the seismic performance is superior.The steel side column is always in the elastic range;The steel beam yields first,and then plastic hinges are formed at the bottom of the wall limbs to achieve the predetermined yield sequence and yield mechanism.The numerical simulation software ABAQUS was used to model the specimen,and the hysteretic curve and skeleton curve were compared,which were in good agreement.The damage condition of the simulated specimen is roughly the same as that of the test,which verifies the reliability of the experimental analysis and numerical simulation method. |
