Study On Seismic Performance Of Concrete Filled Steel Plate Composite Shear Walls

In the high-rise building structure,the shear wall is usually used as the main lateral force resisted component.With the increase of building height,the better mechanical propertie of the shear wall is needed.Therefore,the usage rate of steel plate composite shear wall in super high-rise building structure is increasing.The steel plate composite shear wall is a kind of high performane lateral force resisting component,which rational combines the advantages of concrete and steel.A new type of concrete filled steel plate composite shear wall has been proposed in this paper.The shear wall is composed of steel plates,T-section steel,and channel steel.The original material is well standardized and easy to get.The shear wall can be pre-fabricated in the factory,after that,splicing and pouring the concrete in it to form an integral structure.Four specimens have been designed in this paper in order to explore the seismic performance of the proposed shear wall.Through experiment of low cyclic reversed loading and numerical simulating analysis on the steel plate composite shear wall,we have researched the mechanical properties of the steel plate composite shear wall such as hysteretic behavior,ductility,stiffness degradation and strength degradation.The main conclusions of this paper are as follows:(1)The failure process and mode of the steel plate composite shear wall are mainly shown as follows: The lower part of the steel plate buckles or bulges,and develops into a buckling belt.The side bottom part of the wall buckles or tears.The concrete inside only suffers slight damage at the bottom of the wall.The final damage is the lower part of the steel plate of the shear wall yielding or tearing.And the upper part of the wall is basically integrity.(2)The hysteretic curve of the wall from the experiment is in the shape of a shuttle,the strength and stiffness degenerate slowly.It shows that the shear wall has excellent performance,good bearing capacity,deformability and energy absorption performance.(3)According to the data analysis of the strain gauge dates from the experiment,the steel plate on the sides of the wall and back position which is farthest from the center began to yield first.With the load increasing,the yield range of the steel plate extends to the middle and the upper part,and at the same time,the T-section steel plate in the wall and the outer steel plate work well together,and contribute to the bearing capacity of the shear wall.(4)According to the finite element numerical analysis,increasing the thickness of the steel plate of the shear wall will significantly enhance the initial stiffness and ultimate bearing capacity of the shear wall.When the axial compression ratio increases in a small range(0.12-0.24),it can enhance the ultimate bearing capacity of the shear wall,when the axial compression ratio exceeds this range,the effect is not obvious.The increase of the axial compression ratio will reduce the ductility of the shear wall,the effect on yield displacement is not obvious.The increase of shear span ratio will significantly reduce the initial lateral stiffness and ultimate bearing capacity of the shear wall,but the ductility of the wall will be better when the shear span ratio is large than it is small.