STUDY ON DESIGN METHOD OF VERTICAL BOUNDARY ELEMENT OF PARTIALLY ENCASED COMPOSITE FRAME-STEEL PLATE SHEAR WALLS

Based on the experimental study of the partially encased composite frame-thin steel plate shear walls, it is found that the failure stages of the infilled steel plate include initial diagonal yielding, uniformed yielding, and strain hardening. By introducing the partially encased composite column, the bending-torsion failure modes of traditional steel columns are effectively improved. The failure mode of the partially encased composite column is the strength failure of plastic hinges formed at the top and bottom of the column. Based on the design concept of "strong frame and weak wall panel", it determines the calculation principle of the internal force of the partially encased composite column in the uniformed yielding stage and the strain hardening stage according to the superposition principle, and proposes a design method suitable for frame column of the partially encased composite frame-thin steel plate shear walls. The finite element simulation shows that the design method can effectively predict the failure modes and the locations of the plastic hinges of the bottom compressed column, which can provide theoretical basis for reasonable design of boundary frame column in steel plate shear walls.