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Evaluation of Rotation Capacity of Steel Moment Connections ConsideringInelastic Local Buckling - Parametric Studies  

Lee, Kyung Koo (서울대학교 공과대학 건축학과)
Publication Information
Journal of Korean Society of Steel Construction / v.20, no.5, 2008 , pp. 625-632 More about this Journal
Abstract
In the companion paper (Model Development), an analytical model estimating the available rotation capacity of fully restrained beam-column connections in special steel moment-resisting frames was proposed. In this paper, two limit states were considered as the connection rotation capacity criteria: (i) strength degradation failure when the strength falls below the nominal plastic strength due to the local buckling of the beam's cross-section and (ii) low-cycle fatigue fracture caused by plastic strain accumulation at the buckled flange after only a few cycles of high-amplitude deformation. A series of analyses are conducted using the proposed model with two limit states under monotonic and cyclic loadings. Beam section geometric parameters, such as flange and web slenderness ratios, varied over the practical ranges of H-shapedbeams to observe their effect on the rotation capacity and low-cycle fatigue life of pre-qualified WUF-W connections.
Keywords
rotation capacity; steel moment connection; limit states; strength degradation; low-cycle fatigue; slenderness ratio;
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