Evaluating the effects of using BRB Brace in steel buildings in order to achieve IO level

The main direction of this research is the effect of using buckling buckle in steel buildings in order to achieve the IO level. The validation has been done by using Abaqus software. After validating the 3D simulation of the BRB braces, its parametric study is performed and the sensitivity of the buckling buckle brace is performed. The modeling phase in 2D bracing space and seismic analysis (history-time) of braced frames was performed under different acceleration mapping records. The parameters of this research are the opening member-radius dimensions, geometric shape of the member, type of brace, The effects of the number of floors and the length of the opening in the frame with BRB brace. The results are presented based on pushover diagrams and time-history and relative drift of stories. The results showed that the parameter that has the most impact on the hardness and ductility index is the cross-sectional area and the parameter that has the most impact on the strength index is the cross-sectional geometry. By changing the cross-sectional geometry from the circle to the square of the BRBF brace, relative percentage reduction in stiffness, strength and ductility were obtained 2%, 16% and 10%, respectively. By changing the type of brace from CBF to BRBF, the relative percentage of increase in stiffness was between 30 to 62%, the relative percentage of increase in strength was between 63 to 69% and the relative percentage of increase in ductility was between 12 to 30%. The amount of drift roof in the analysis of time history under different earthquakes, in BRB 4, 8 and 12 floors in the range of 1.19 to 1.51 times has been achieved. Hardness and ultimate strength and ductility indices decreased with increasing opening, decreased with increasing cross section and decreased with increasing height.