Seismic Performance Of Steel Column-Reinforced Concrete Shear Wall Hybrid Coupled Structure System

Coupled shear walls are widely used in high-rise buildings in cities with medium and high earthquake intensity in China because of their high lateral load resistance capacity,good coupling effect in earthquake action,and the realization of multiple seismic defense line mechanism.The traditional single shear wall can not play the multiple anti-seismic defense mechanism of coupled shear wall.The coupling mechanism of coupling beam and wall pier is introduced into the single shear wall structure to form steel column-RC wall hybrid coupled structure system,which can greatly improve the traditional single shear wall’s severe damage and difficult to repair and strengthen under the earthquake disaster,and help to improve the seismic performance of high-rise building shear wall in middle and high intensity area,and promote the development of shear wall towards the direction of earthquake resistant structure with recoverable function.Compared with the hybrid coupled shear wall with both ends of the steel coupling beam connected to the concrete wall,one end of the steel coupling beam of SCRCW structure system is connected to the steel side column,so the construction is simpler and the replaceability of the coupling beam components is better.SC-RCW structure system is suitable for multi-storey and high-rise buildings in medium and high intensity areas.It is a new form of steel-concrete composite structure system and a further extension of the traditional concept of coupled wall.It has strong research significance and academic value.As a new type of coupled shear wall structure,the current research content is less,because of the limitations of its site conditions,the number of components and so on,it is unable to understand its seismic performance in detail.In this paper,based on the existing test structure of SC-RCW structure system,the finite element model is established to further analyze the influence of various parameters on the seismic performance of SC-RCW structure system,investigate the optimal energy dissipation mechanism of coupling beam,and reveal the working mechanism of double seismic defense of steel coupling beam and shear wall pier under the condition of overall stress.On the basis of the existing plastic design method based on energy balance,combined with the internal force adjustment measures of relevant codes,the design method based on coupling ratio of this structure is sorted out and derived.The static elastic-plastic analysis and nonlinear dynamic time history analysis of this structure are carried out by using ABAQUS software.The whole reaction process of the structure from elasticity,cracking,yield,limit to collapse under strong earthquake and the failure of components are obtained,so as to explore the seismic performance of this excellent new structure more comprehensively.The main research results and conclusions are as follows:(1)The design axial compression ratio,the span to deepth ratio of steel coupling beam and the height width ratio of wall pier all have certain influence on the horizontal bearing capacity of wall pier,which will increase with the increase of axial compression ratio,and gradually decrease with the increase of the span to deepth ratio of steel coupling beam and the height width ratio of wall pier.When the height width ratio of the wall is too large,the ability of the wall to bear the horizontal load in the system is weakened,the stiffness of the whole structural system is reduced,and the structural system is easier to yield.(2)Larger axial compression ratio will lead to the increase of stiffness,the deterioration of ductility,the increase of yield load,the decrease of yield displacement and the decrease of ductility coefficient.When the span to height ratio of steel coupling beam is about 4.0,the hybrid coupled shear wall with double side columns can maintain high yield load and yield displacement,and has good deformation capacity.(3)The steel coupling beams yield before the wall pier,and when the coupling ratio is larger,it is more and more difficult for the steel coupling beams to reach its yield condition,and the earlier the wall pier section reaches the yield state,so excessive CR should not be selected to ensure that the steel coupling beams can enter the yield stage,fully consume the seismic input energy,and reduce the damage to the wall pier.(4)When designing the shear bearing capacity of steel coupling beams,a certain distribution coefficient should be adopted for the shear force of steel coupling beams.The distribution coefficient should be changed with the change of layer height and CR.