Finite Element Analysis On The Hysteretic Behavior Of Innovative Steel And Concrete Hybrid Coupled Shear Wall

The innovative hybrid coupled wall is a kind of new structure system which is made of a single RC wall coupled to two steel side columns by means of steel links.The system has both the the ability of eccentric support shear dissipation and the advantages of large stiffness of the RC wall.Regarding this kind of structural system,on the one hand,the steel beam as a dissipation components along the wall,bear most of the overturning moment;on the other hand,due to the coupling beam,reducing the bending moment of the wall,delayed the formation of plastic hinge.Therefore,the in-depth study on tins system has important practical significance.In order to study the seismic performance of the innovative hybrid coupled walls,a three-story research case is designed.The finite element software ABAQUS 6.11 is used to build the model,and the low-cycle cyclic loading is carried out.The coupling ratio CR,the failure mode of coupling beam,steel beam yield strength and axis compression ratio are studied on the seismic behavior of the system.Get the following conclusions:(1)The coupling ratio CR is directly related to the seismic performance of the innovative hybrid coupled walls.When the coupling ratio of the structure is 45%,the plasticity of the web of steel beams is fully utilized,the hysteretic performance is good,the bearing capacity is high,the displacement ductility is the best,the requirements of the multi-channel defense design of the seismic design are satisfied,and the structural rigidity is moderate.When the design coupling ratio increases from 30% to 70%,the displacement ductility increases first and then decreases.It is recommended to control the coupling ratio between 45% and 60%.(2)Regarding HCSW system,shear failure and bending failure are both a better form of damage.The bending failure has a higher bearing capacity,but the displacement ductility is lower and the structural deformation ability is worse.From the economic point of view,shear damage is more economical to save steel.Overall,the shear type performance is better than the bending type,in the design,shear failure steel beam was selected firstly.(3)The improvement of yield strength of steel beam has no obvious advantages to improve the seismic performance of the structure.(4)The increase of the axis compression ratio of the wall makes the displacement andductility of the structure decrease greatly,and the plastic hinge of the wall limbs is seriously damaged.The axis compression ratio should not be too large,it is recommended to control between 0.2 to 0.4.