Seismic Performance of Corrugated Double-Skin Composite Shear Walls with Different Aspect Ratios

Corrugated double-skin composite shear (Co-DSC) walls consist of concrete filled steel tubes and a pair of corrugated steel faceplates connected by tie bolts with concrete infill. Three specimens with different shear-span ratios and one specimen with reinforcing sheaths at the bottom of steel tubes were tested under axial and cyclic lateral load. Failure pattern and cyclic behavior were presented and analyzed. Squat Co-DSC wall yielded by diagonal section of corrugated faceplate yielding, and failed by steel tube fracture, corrugated faceplate buckling, infilled concrete crushing and cracking. Slender corrugated DSCS walls yielded by steel tube yielding, and failed by steel tube fracture, steel faceplate buckled throughout wall base, and infilled concrete crushing. The strength, stiffness, and deformation capacities of squat Co-DSC wall were higher than that of slender Co-DSC walls, while the ductility and energy dissipation capacity were the opposite. Test results revealed that the proposed bottom reinforcing sheaths could improve deformation capacity of the slender wall, meanwhile the base shear was not increased. Stronger boundary columns are recommended to be used in the corrugated DSCS walls to improve the seismic performance. Finite element (FE) push-over analyses were conducted, and were in good agreement with the test results. Primary parameters, including aspect ratio, axial load ratio, and ratio of tie bolt spacing to faceplate thickness, that influencing the overall behavior of Co-DSC walls were analyzed.

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