Papyrus Press Advance Researches in Civil Engineering 2645-7229 4 1 2022 03 01 Investigating the Seismic Performance of Steel Moment-Resisting Frames by Using Damage Index 15 33 150293 10.30469/arce.2022.150293 EN Kourosh Mehdizadeh Department of Civil Engineering, Garmsar Branch, Islamic Azad University, Garmsar, Iran Fatemeh Jadali B.Sc, Department of Civil Engineering, Birjand Branch, Islamic Azad University, Birjand, Iran Saeid Heidari Department of Civil Engineering, Roudehen Branch, Islamic Azad University, Roudehen, Iran Abbasali Sadeghi PhD Candidate, Department of Civil Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran 0000-0002-3016-9080 Seyede Vahide Hashemi Department of Civil Engineering, University of Sistan and Baluchestan, Zahedan, Iran Journal Article 2021 09 18 In the seismic analysis of structures, estimation of amount of damages to the elements is of great importance. In the quantitative method of estimating damages, it is possible to assess damages to the storey and the total structure by introducing damage indices. The results of studies show that damage indices could be used as a suitable basis in assessing the function of structure against back and forth forces of earthquake excitations. These indices are calculated based on functions of deformation, and dissipated energy of elements in frames. In this study, the steel moment-resisting frames with 4, 7, 10, 15, 20, and 25-story and 3 and 5 bays are designed and then, they are modeled in OpenSees software in order to investigate the performance of steel moment-resisting frames under seismic excitations by using damage index. In the following, nonlinear dynamic time history analysis is conducted and the damages of aforementioned frames are calculated quantitatively and the results showed that the behavior of high-rise, mid-rise, and low-rise frames were affected based on their vibration periods and dependent to the nature of the studied earthquakes. https://www.arce.ir/article_150293_93bafa227464733e7147e7701fd9b038.pdf