ROLE OF INNOVATIVE STEEL DAMPER IN IMPROVEMENT OF CONCRETE BRACED FRAMES EMPLOYING FLEXURAL AND SHEAR FLEXURAL MECHANISM

This research presents a novel damper that is simple to make, install, and replace following a strong earthquake. With the help of this suggested damper, the diagonal brace component in the CBF system exhibits ductile behavior instead of inappropriate behavior (buckling) (yielding in the damper). The goal of the present investigation is to determine how new steel dampers, which use flexural and shear flexural mechanisms, might improve concrete braced frames. Employing parametric research and specimen testing, this paper investigates the movement of reasonable, stocky, and thin plates as well as the efficacy of several elastic and plastic buckling solutions for rectangular flat plates. In the event of seismic loads, the suggested damper acts as a ductile fuse, guaranteeing frame elasticity and simple repair after earthquakes. It can be fitted to braces premade, improving the quality of the welding. It monitors hysteresis automatically and was tested at the International Institute of Earthquake Engineering and Seismology. The findings, in conjunction with the analysis of finite elements, demonstrated that the plate's mechanism shifted from flexural to shear upon joining the cross-flexural plate to the main plate. However the cross-flexural plate functions as a flexural mechanism in every situation. Conversely, converting the shear system to a flexural mechanism decreased the ultimate displacement while increasing stiffness and strength. Models lacking cross-flexural plates were shown to have less durability and energy-dissipating capabilities when comparing specimens' hysteresis curves. The damper's behavior was enhanced by adding the flexural plate without attaching it to the main plate, mostly through an increase in the damper's ultimate displacement. The ultimate strength and stiffness were increased by 86% and 4.2, respectively, by joining the cross plate and web plate, however the ductility was decreased by 2.46. Moreover, correlations were suggested to accurately forecast the dampers' performance.