Evaluation of the effect of different Endurance Time Excitation Functions in steel buildings equipped with new Rotational Friction Dampers

The Endurance Time method is the method that was considered. In this research,, two 15 and 20 story shear building were evaluated by performance weakness in return periods equal to 475 years by a new ET generation, and the results were compared with the second generation and natural earthquake records In Seismo-Struct software. The Endurance Time curve showed the performance and durability of the structure equipped with a friction damper compared to the structure without the damper. It was also observed that the fourth-generation records of Endurance Time in nonlinear displacements than the second-generation records show results closer to the natural scaled records of the earthquake, and for frame equipped with Rotational Friction Dampers whose period was less than 2 seconds, the results have good accuracy. While for structures with period of more than 4 seconds, there is still a slight difference. It was also observed that the response of 15 and 20 story frames with F series records is 50% different from natural records, while Kd series records are less than 20% different. These results show the quality and accuracy of new generation records of Endurance Time for structures with a period of less than 3 seconds and weakness performance.