Structural Performance of Concrete-Filled Funnel-Shaped Profiled Steel Sheet Composite Shear Walls Subjected to Lateral Cyclic Loading

A concrete-filled funnel-shaped profiled steel sheet (CFFPSS) composite shear wall is proposed, taking advantage of the funnel-shaped ribs as natural shear connectors. A total of eight CFFPSS wall specimens were tested under combined axial and lateral loading, with varying test variables such as the shear span ratio, axial load ratio, concrete strength, steel sheet thickness, and additional connection configurations. Three-dimensional digital image correlation (3D-DIC) technology was used to capture the development of the local buckling and the full-field strain of the steel sheets. The test results showed that the funnel-shaped ribs considerably improved the cooperative performance between the steel sheets and the concrete infill, eliminating the need for further connection strengthening. All the test walls, including the squat walls failing in shear, exhibited stable hysteresis behavior and satisfactory deformation capacity. The ultimate drift ratios of the test walls ranged from 1.9% to 3.3%. The 3D-DIC results demonstrated that a uniform tension field was formed after the shear buckling of the steel sheets, which provided considerable postbuckling strength reserve. Formulas for calculating the shear and flexural strengths of the CFFPSS walls were also developed, which gave reasonably accurate predictions.