The Research On The Ductility Of Steel Reinforced Concrete Special-Shaped Column

Though be characterized by saving room, the structures of the Reinforced Concrete Special-shaped Column (RCSC) have an insufficiency in loading capacity and ductility. In order to enhance loading capacity and ductility of RCSC, steel is added to form Steel Reinforced Concrete Special-shaped Column (SRCSC).The neutral axis change along with axial load ratio, load angle, section size etc. For the neutral axis of SRCSC is neither plumb with the plane that the moment work on, nor parallel with borderlines of SRCSC section, it is difficult to get loading capacity and ductility of SRCSC on biaxial eccentric loading. Based on the plane-section assumption, a method for the nonlinear analysis of complete response process for ductility of 15 L-shaped SRCSC, 15 T-shaped SRCSC, and 15 Cross-shaped SRCSC is presented. It include 36 sets for load angle, 6 sets for axial load ratio, 3 sets for concrete strength, 3 sets for the content of steel, 2 sets for steel style, 3 sets for stirrup ratio, 3 sets for steel location, 3 sets for section size, 3 sets for stirrup diameter about L-shaped and T-shaped SRCSC. Also it include 9 sets for load angle, 6 sets for axial load ratio, 3 sets for concrete strength, 3 sets for the content of steel, 2 sets for steel style, 3 sets for stirrup ratio, 3 sets for steel location, 3 sets for section size, 3 sets for stirrup diameter about Cross-shaped SRCSC. The ductile behavior of L-shaped, T-shaped and Cross-shaped SRCSC with calculating 2658 loading conditions, are investigated. It concluded that axial load ratio, load angle, and ratio of the spacing of stirrups and longitudinal reinforcement's diameter (s/d) are most important factors. Based on Least squares method, the formulas for ductility are presented.Adapted to the section of SRCSC and steel, the method, which the element mesh is not base on 2D grids, but the boundaries of sections, is presented with high precision and efficiency.A research on hysteretic behavior of T-shaped SRCSC, taken axial load ratio, load angle, and shear-span ratio into account, is processed.