• 【Title】Cyclic in-plane shear behavior of double-skin composite walls for high-rise buildings
• 【Abstract】Double-skin composite (DSC) walls consist of a thick concrete infill sandwiched in between two steel faceplates on the exterior surfaces. DSC walls used in high-rise buildings have higher reinforcement ratios and are subjected to larger axial-force ratios as compared to DSC walls used in safety-related nuclear facilities. This paper presents the results of experimental and numerical investigations conducted to evaluate the cyclic in-plane shear behavior of DSC walls for high-rise buildings, and the influence of higher reinforcement ratios and axial-force ratios. The DSC wall specimens were designed with a reinforcement ratio of 6.4%, and with flange walls designed as boundary elements to ensure that the walls would be shear critical. The wall specimens failed by cyclic yielding and local buckling of the steel faceplates in the web walls, and eventual crushing of the concrete infill. The steel faceplates prevented spalling of the crushed concrete and as a result, the wall specimens had stable hysteretic loops and large shear-deformation capacity. Using vertical stiffeners and tie battens as connectors further increased the shear-deformation capacity of the wall specimens, with the ultimate shear strain reaching 3%. A mechanics-based model (MBM) was used to analyze the in-plane shear response of the wall specimens. The experimental and analytical investigations indicate that axial compression has limited influence on the shear strength, but decreases the shear-deformation capacity of the DSC walls. Analytical parametric studies indicate that for DSC walls made using normal-strength concrete and steel, high reinforcement ratios (of over 7.5%) and high axial-force ratios (exceeding 0.40) can potentially lead to crushing of the concrete infill prior to yielding of steel faceplates, and thus nonductile failure modes. Finally, the design equations specified in various codes are verified using experimental results of 42 specimens from past tests and from this experimental program. Those code equations provide reasonable and conservative estimations of the shear strength of DSC walls, with the ratio of experimental-to-calculated values equal to approximately 1.30 on average.
• 【Keywords】Double skin composite walls; Steel-plate Composite Walls; Composite Construction; Cyclic shear behavior; Shear strength; Mechanics based model; Deformation capacity; Design equations
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