Semnan University Press Journal of Rehabilitation in Civil Engineering 2345-4415 7 4 2019 11 01 Effect of Degradation on Collapse Margin Ratio of Steel Moment Frames 168 179 3488 10.22075/jrce.2018.12535.1240 EN Saeid Bazvand Department of Civil Engineering, Islamic Azad University Shahre Kord branch, Shahre Kord, Iran Ehsan Darvishan Department of Civil Engineering, College of Engineering, Roudehen Branch, Islamic Azad University, Roudehen, Iran Gholamreza Ghodrati Amiri School of Civil Engineering Iran University of Science & Technology Journal Article 2017 11 20 Although several studies have investigated the effect of degradation on the behavior of structures, inspections on collapse margin ratios are rare in the literature. In this study, the effect of strength and stiffness degradation on collapse capacity of steel moment frames is inquired. The aim is to determine margin of safety against collapse applying a probabilistic approach. To this end, 14 moment frames are designed including 4 long period and 3 short period models with 5 and 8m bay length. These buildings are representative of common office and residential buildings built in cities. Also, they are designed in consonance with ASCE7-05 specifications. In the first stage, effective seismic parameters are calculated using a pushover analysis. In the second stage, collapse performance levels are determined using incremental dynamic analysis by considering seismic excitation uncertainties. Results reveal that the overstrength factor that is recommended by ASCE code is not always conservative. Overall, structures designed with common building codes show acceptable margin of safety against collapse. https://civiljournal.semnan.ac.ir/article_3488_9d55ab3f6329ce1c92ddd80340bddc0e.pdf