Seismic Behavior Of Double-skin Corrugated Composite Shear Wall

The double steel skin composite shear walls efficiently combine the steel and concrete materials,with advantages including high strength,high ductility and energy dissipating capacity,convenient construction etc.,which have been utilized more and more in high-rise and super high-rise buildings.The traditional double steel skin composite shear walls used flat steel plates,which might buckle outward if the thickness of the concrete wall is relatively large or the steel plate is relatively thin,while using corrugated steel plates could solve this problem effectively,improve the lateral characteristics of the steel plates,and even reduce the number of connectors between the steel plates.This paper focuses on the seismic behavior of double steel skin corrugated composite shear wall,which is a new type of lateral load-resisting system,and the major research work and findings are summarized below:(1)Three 1:3 scale specimens with a shear-span ratio of 1.5 were designed,including one double-skin flat composite shear wall specimen and two double-skin corrugated composite shear wall specimens,and low-cycle cyclic tests were conducted in order to explore and compare the seismic performance and failure modes of the three composite shear wall specimens.It was found that failure modes of the double-skin corrugated composite shear wall specimens were serious bucking and tearing of the edge steel tubes near the bottom,and crushing of the concrete at that location.The specimens all had relatively full hysteretic curves,with a ductility ratio above 4;the bearing capacity and energy dissipation capacity of the two double-skin corrugated composite shear wall specimens were higher than the double-skin flat composite shear wall specimen.(2)Finite element software ABAQUS was used to establish the numerical model of three test specimens,and the hysteretic analyses were carried out.Analytical results were compared with the experimental results to verify the FEA model.It was found that the finite element analyses could accurately reflect the stress state,stress development,deformation and bearing capacity etc.of the test specimens under cyclic loading.Parametric study models were established to analyze the influence of steel plate thickness,steel plate strength,concrete strength,axial compression ratio and bolt spacing on the seismic performance of double-skin composite shear walls,both flat and corrugated.The results indicated that when the steel thickness increased,the initial stiffness and bearing capacity of the double-skin corrugated composite shear walls would increase apparently.When the steel strength increased,the initial stiffness of the corrugated composite walls would remain unchanged and the bearing capacity would increase significantly.When the bolt spacing decreased,the initial stiffness and bearing capacity of the corrugated composite walls would both increase.The influence of concrete strength on the initial stiffness and bearing capacity was quite limited.When the axial compression ratio increased,the bearing capacity of the flat composite walls would decrease quite obviously,while the bearing capacity of the corrugated composite walls would remain stable to a certain extent.(3)Combining the experimental results,the finite element analysis and the theoretical results,formula for the compression-bending capacity of double-skin composite shear walls was derived.The calculation results of the formula had small difference with the test results,with a certain safety reserve.