Comparing seismic performance of using pipe damper in toggle and diagonal braces

Passive control of the structure is a system that dissipates the input energy caused by lateral loads without the need for an external energy source. Improvement of seismic performance of the structures equipped with a damper, lies in increasing the energy dissipation and decreasing the vibration of the structure. For this purpose, Toggle Brace Damper system can be used to follow design guidelines. This paper aims to compare the results obtained from SAP2000 software for two structures equipped with Toggle Brace Damper (TBD) and Diagonal Brace Damper (DBD). In this research, time-history analysis is used by applying the El Centro, Kobe and Tabas earthquake records. The dampers used in all models are the same pipe dampers selected from the hysteretic type. The results suggest that the roof displacement of the TBD system in the 2 and 5-story frames decrease in average 77 and 42 percent respectively compared to that of DBD system. The drifts of the floors in the TBD system for 2-story frame are 82 and 78 percent in the 1st and 2nd floors respectively and for the 5-story frame are 53, 46, 41, 35 and 30 percent in the 1st to 5th floors respectively, lower compared to those of DBD system. Magnification factor (ratio of axial damper displacement to floor displacement as ductility capacity) of the 1st story in the TBD and DBD systems for 2-story frame are 1.83 and 0.74 percent respectively and in the 2nd story of TBD and DBD systems for 5-story frame are 1.46 and 0.73 percent respectively.