THE EFFECT OF GAP BETWEEN REINFORCED CONCRETE WALL AND THE STEEL PLATE ON BEHAVIOR OF THE BUCKLING-RESTRAINED STEEL PLATE SHEAR WALL

Steel shear wall is one of the relatively new resistant systems that has been used in designing and reinforcing high-rise buildings in the last four decades. Due to the optimal performance of this type of lateral load system, including high hardness, good ductility, and high energy dissipation, this system can also be used to rebuild non-lethal structures. The composite steel shear wall consists of a steel plate surrounded by slats by beams and columns and concrete coverings on either side or both sides of the steel plate. In this system, the reinforced concrete coating, by inhibiting the steel plate and preventing its buckling, raises the shear capacity of the steel shear wall to the extent that it is submitted to the inside of the sheet plate instead of stretching along the tensile field (which occurs in thin steel shear walls). In this research, a new type of composite steel shear walls, in which the concrete covers, instead of the complete bond with the sheet, is studied numerically. Accordingly, the steel shear walls with concrete coatings of zero and 15 mm between steel sheets and concrete coatings have been studied parametrically after the verification. In addition, these studies have been carried out between concrete casing and perimeter frame in two cling-and-seamed modes. The results of numerical studies of more than 160 finite element models showed that increasing the distance between concrete and steel sheet reduced the strength and hardness of the system. Moreover, in the case where there is a gap between the concrete and the steel sheet, the coefficient of behavior is 11.21 on average and 8.11in the non-distant state. In addition, concrete casting on both sides of the steel plate in a non-distant area with boundary elements causes a 45% increase in hardness.