Experimental Study On Grille-type Steel Plate Concrete Composite Shear Wall Under Low Cyclic Loading

With the development of supertall buildings,the shear wall structure meets new challenges of high axial pressure ratio,high ductility and thin walls.Learn from the advantages of steel pipe concrete,and puts forward the new concept of grille type steel concrete composite shear wall,in this paper,by using the combined method of experimental analysis and finite element analysis,to carry out the grille type steel concrete composite shear wall performance analysis and research,combined with the engineering example,the static elastoplastic Pushover analysis and dynamic elastic-plastic time history analysis,validate the superiority of concrete-filled steel tube-grille type steel concrete composite shear wall core tube structure seismic performance.The main work and research results are as follows:This article made three grille type steel concrete composite shear wall test components,and to carry out the composite shear walls subjected to low-cyclic reversed horizontal load test,draw out the hysteretic curve and skeleton curve of the specimens,the test shows that grille type steel concrete composite shear wall has advantages of high bearing capacity,ductility and energy dissipation capacity.The concrete in the tube is under three pressure condition,which increases the compressive strength and ductility of the concrete.As a result of the existence of in-pipe concrete slab and the function of the internal diaphragm plate steel effectively limit the out-of-plane deformation of steel plate,the grille type steel concrete composite shear wall has good ability to resist buckling.On 1/25 displacement angle,cyclic loading 60 times,the plastic hinge region of the new composite steel plate shear wall has still no obvious damage,trial without any sound,shows that new composite shear wall under severe earthquake also has good working performance.Use ABAQUS software to establish the finite element analysis of steel concrete composite shear wall model,the bearing capacity,deformation capacity,energy dissipation capacity and ductility in all aspects such as the seismic performance of composite shear wall were analyzed,and coincide better with the test results,are in good agreement.Established the finite element analysis of reinforced concrete shear wall model,compare the two seismic performance research,and verify the superiority of composite shear wall seismic performance.This article carried out this new grille type steel concrete composite shear wall seismic performance influence analysis including axial compression ratio,screen wall height to width ratio,aspect ratio,concrete strength,thickness of steel plate and steel strength parameters,and established the new composite shear wall restoring force model.Combined with engineering example,this article established concrete filled steel tubular frame-grille type steel concrete shear wall core tube structure system analysis model,carried out static elastoplastic Pushover analysis and dynamic elastic-plastic time history analysis research under severe earthquake loads.This article verifed the superiority of the new composite shear wall structure seismic performance from the bottom of the interlayer displacement angle,structure seismic performance of shear force and shear force distribution ratio analysis contrast.Under strong earthquakes,the structure of the overall seismic performance can meet the specification requirements of the third level seismic fortification goal "no collapsing under strong earthquake",and the structure also has a great bearing capacity and stiffness,ductility,etc.,can continue to withstand the severe earthquake loads,ensure no collapsing under strong earthquake...