Plastic hinge location in columns of steel frames subjected to seismic actions

Type of content
Journal Article
Publisher's DOI/URI
Thesis discipline
Degree name
Publisher
University of Canterbury. Civil and Natural Resources Engineering
Journal Title
Journal ISSN
Volume Title
Language
Date
2008
Authors
Peng, B.H.H.
MacRae, G.A.
Walpole, W.R.
Moss, P.
Dhakal, Rajesh
Clifton, C.
Abstract

Several steel structure standards around the world contain an equation to encourage any column flexural yielding during earthquake shaking to occur at the column ends, rather than along the column length. The accuracy of these equations and their applicability to columns of both moment frames and braced frames are examined in this paper. It is shown, using an analytical procedure developed from first principles considering the reduction in member stiffness from axial force due to geometric and material nonlinearity, that the existing code equations are conservative. Less conservative empirical equations are developed based on the analysis results. It is found that these equations are applicable to frames with a braced connection, rather than a moment connection into the column. Time-history analysis of eccentrically-braced frames with inverted V-bracing, where the active link occurs at the centre of the beam, is carried out. The likely column end moment ratio needed for the new equations is determined. The analysis also shows that yielding often did not occur in the bottom story columns during earthquake excitations. A simple check is proposed to relate the axial force limit and the design drift to flexural yielding of columns which can be used in conjunction with the proposed equations

Description
Citation
Peng, B.H.H., MacRae, G.A., Walpole, W.R., Moss, P., Dhakal, R., Clifton, C. (2008) Plastic hinge location in columns of steel frames subjected to seismic actions. Bulletin of the New Zealand Society for Earthquake Engineering, 41(1), pp. 1-9.
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Ngā upoko tukutuku/Māori subject headings
ANZSRC fields of research
Fields of Research::40 - Engineering::4005 - Civil engineering::400502 - Civil geotechnical engineering
Fields of Research::40 - Engineering::4005 - Civil engineering::400504 - Construction engineering
Fields of Research::40 - Engineering::4005 - Civil engineering::400510 - Structural engineering
Fields of Research::40 - Engineering::4005 - Civil engineering::400506 - Earthquake engineering
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