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http://dx.doi.org/10.5000/EESK.2014.18.2.105

Seismic Performance Evaluation According to Rotation Capacity of Connections for Intermediate Steel Moment Frames - II. Cause Evaluation and Alternative  

Moon, Ki Hoon (Department of Architectural Engineering, Hanyang University)
Han, Sang Whan (Department of Architectural Engineering, Hanyang University)
Ha, Seung Jin (Department of Architectural Engineering, Hanyang University)
Publication Information
Journal of the Earthquake Engineering Society of Korea / v.18, no.2, 2014 , pp. 105-115 More about this Journal
Abstract
This paper is the sequel of a companion paper (I. Performance Evaluation) evaluating the relation between the seismic performance of steel intermediate moment frames (IMFs) and the rotation capacity of connections. The evaluation revealed that the seismic performance of IMFs having the required minimum rotation capacity suggested in the current standards did not meet the seismic performance criteria presented in FEMA 695. Therefore, thepresent study evaluates the causes of the vulnerable seismic performance for steel IMFs and proposes alternatives to satisfy the seismic performance suggested in FEMA 695. To that goal, the results of nonlinear analysis, which are the pushover analysis and the incremental dynamic analysis, are examined and evaluated. As a result, high-rise IMF systems are seen to have the lower collapse margin ratio after connection fracture than row-rise IMF systems and, the actual response isfound to compared tothedesign drift ratio acting on design load design. Finally, the minimum design load values are proposed to meet the seismic performance suggested in FEMA 695 for IMF systems having vulnerable seismic performance.
Keywords
Intermediate moment frame; Rotation capacity; Seismic performance; FEMA 695; Seismic design parameters;
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