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Seismic Performance Evaluation of Post-Northridge WUF-B Connections Frame  

Han, Sang Whan (한양대학교 건축공학과)
Moon, Ki Hoon (한양대학교 건축공학과)
Jung, Ji Eun (한양대학교 건축공학과)
Lee, Ki Hak (세종대학교 건축공학과)
Publication Information
Journal of Korean Society of Steel Construction / v.19, no.6, 2007 , pp. 751-760 More about this Journal
Abstract
The purpose of this study is to evaluate the seismic performance of the frame which is assumed to be used with Welded Unreinforced Flange-Bolted web (WUF-B) connections and detailed in compliance with FEMA 350 recommended seismic design criteria. In FEMA 350, these types of connections are only valid for Ordinary Moment-Resisting Steel Frames (OMRSFs). For this purpose, based on test results, we proposed an analytical model for the Post-Northridge WUF-B connections with different panel zone strength ratios. Using the connection model, SAC Phase II three and nine-story frames were modeled and analyzed. From a nonlinear static pushover analysis, ductility, maximum strength, and the maximum interstory drift ratio were investigated for buildings with Post-Northridge details. Moreover, the maximum interstory drift ratio of each performance level (IO and CP) was also investigated through Incremental Dynamic Analysis (IDA). Analytical results were compared with those of buildings with either Pre-Northridge connection or ductile connections with no fracture. The analytical results showed that buildings with Post-Northridge WUF-B connections provide superior strength and interstory drift ratio capacity than buildings with Pre-Northridge WUF-B connections.
Keywords
WUF-B connections; Connections Fracture; IDA; Performance Evaluation; Drift capacity;
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