Experimental Research On Seismic Behavior Of Full-scale Steel Reinforced Concrete Shear Wall

Shear wall structure was widely used as lateral force resistant structure because of its large lateral stiffness,high horizontal force and ductility.With the increase of the height of the structure,the bottom gravity load and the shear force of the shear wall structure become much larger.As a result,the thickness of shear walls increases,ductility decreases and bearing capacity is insufficient.Therefore,steel plates were added to the shear wall to form a steel reinforced concrete shear wall structure.Steel reinforced concrete shear wall has many advantages,such as high ductility,and smaller lateral movement under earthquake.More and more scholars pay attention to steel reinforced concrete shear walls and completed a lot of research.However,most of the existing experimental studies focus on the scale shear wall specimens with reduced size,and there were few studies on the full-size specimens.At the same time,these studies lack a comparative analysis of the failure forms and properties of steel reinforced concrete shear walls under bending and shear loads.Therefore,it is necessary to carry out further research in these aspects.Four new types of steel plate-stud concrete shear walls with different cross sections were designed.Two shear walls were steel reinforced concrete shear walls and the other two were ordinary reinforced concrete shear walls.The cyclic loading test was carried out to analyze the failure process.The results show that the shear-wall specimens with large shear span occurred bending failure forms.Cracks of the walls developed slowly.The shear-wall specimens with small shear span occurred shear failure forms.Cracks extended diagonally across the wall surface.The overall deformation of the structure became smaller.The shearwall specimens with steel plates showed slower crack elongation and smaller width.The collapse of concrete was relatively mild when the specimens damaged.For shear-wall specimens without steel plates,the cracks developed rapidly and the cracks width were large.The spalling of concrete was serious.The seismic behavior of shear-wall specimens was analyzed and the results show that shear wall specimens with smaller shear span had larger bearing capacity.Its initial stiffness and energy dissipation capacity were obviously better than the specimens with large shear span.The specimens with larger shear span had higher ductility and better deformation ability.The shear-wall with steel plates had higher bearing capacity,higher stiffness,better ductility and higher energy dissipation capacity.In the shear wall specimens of steel-reinforced concrete,the steel plates,studs and concrete could work together well,and no stud shedding or slippage occurred.Steel plates can replace part of steel bars and concrete to enhance the overall bearing capacity of the shear-wall specimens.The shear walls were analyzed by ABAQUS,and the simulation results were consistent with the experimental results.It can be seen that the addition of steel bones replaced the role of some reinforcement bars and improved the bearing capacity of shear wall specimens.On this basis,the effects of concrete strength,steel plate thickness and other factors on the seismic performance of shear-wall specimens were studied.The results show that when the axial compression ratio,steel plate thickness and concrete strength increased,and the shear span ratio decreased,the bearing capacity of steel shear wall specimens increased.When the axial compression ratio decreased,the thickness of steel plate,the shear span ratio and the strength of concrete increased,the ductility of steel bone shear wall increased.When the axial compression ratio increased or the shear span ratio decreased,the bending deformation of shear wall specimens decreased and the shear deformation increased.When the axial compression ratio decreased,the thickness of steel plate and the strength of concrete increased,the concrete damage of steel skeleton shear wall specimen decreased,the cumulative plastic deformation is significantly reduced,and the damage degree was relatively light.