THEORETICAL ANALYSIS AND EXPERIMENTAL VERIFICATION OF SELF-CENTERING FABRICATED PRESTRESSED STEEL FRAME SYSTEM

Focused is on the theoretical analysis of a new type of self-resetting prestressed steel frame system, upon analyzing and expounding the various states of the change process of the wire force of the steel strand and the force of the self-centering joint, to deduce the theoretical calculation formula of the initial rotation center position, of the changing length of the steel strand, of the wire force of the steel strand and, of the external load under different states. By analyzing the theoretical hysteresis curve of the self-centering joint and the load-displacement curve of the self-centering frame, it is further deduced for the theoretical calculation formula of the ratio of the energy dissipation coefficient of the self-centering joint to the stiffness of the frame before and after the opening of the joint, and each process in the load-displacement curve is analyzed and explained. The opening load, energy dissipation coefficient, and stiffness ratio of frame before and after opening of self-centering joints in the self-centering frame test were compared with the theoretical calculation value. The results show that: the experimental value is basically equal to the theoretical value, thusly the theoretical analysis is reasonable, which can predict and explain the experimental phenomena and results well, and the theoretical formula has high accuracy, providing a theoretical basis for subsequent engineering applications.