Prediction of Column Axial Forces in Inverted V-braced Seismic Steel Frames Considering Brace Buckling

Cho, ChunHee; Lee, Cheol-Ho; Kim, Jeong-Jae

doi:doi:10.1061/(ASCE)ST.1943-541X.0000377

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Prediction of Column Axial Forces in Inverted V-braced Seismic Steel Frames Considering Brace Buckling

J. Struct. Eng. 137, 1440 (2011); http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000377 (11 pages)

ChunHee Cho¹, Cheol-Ho Lee, M.ASCE², and Jeong-Jae Kim³

¹Graduate student, Dept. of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332. E-mail: ccho37@gatech.edu
²Professor, Dept. of Architecture & Architectural Engineering, Seoul National Univ., Seoul 151-742, Korea (corresponding author). E-mail: ceholee@snu.ac.kr
³Graduate Student, Dept. of Architecture & Architectural Engineering, Seoul National Univ., Seoul 151-742, Korea. E-mail: kitchen0@snu.ac.kr

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(Submitted 18 May 2010; accepted 3 January 2011; posted ahead of print 17 May 2011)

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Abstract

References (13)

Article Objects (21)

Brace buckling in inverted-V-braced frames induces the vertical unbalanced force. The columns in the braced bay should be designed, per the capacity design concept, to remain elastic for gravity load actions and additional column axial forces that result from the brace buckling. However, owing to the difficulty in accumulating the buckling-induced column forces from different stories, empirical and often conservative approaches have been used in design practice. In this paper, three combination rules for a rational estimation of the column axial forces are proposed. The idea central to the three methods is to detect the stories with high buckling potential as precisely as possible by using pushover analysis and/or simple demand-to-capacity analysis. The vertical unbalanced forces in the stories detected as high buckling potential are then summed in a linear manner, whereas those otherwise are combined by following the SRSS (square root of sum of squares) rule. The accuracy and design advantage of the three methods is evaluated on the basis of extensive inelastic dynamic analyses. The mode shape-based method (MSBM), which is both simple and accurate, is recommended as the method of choice for practicing engineers among the three proposed.

Article Outline

Introduction
Review of Existing Methods
1. Upper Bound Estimation
2. Estimation by using Amplified Seismic Load Method
3. Method Proposed by Redwood-Channagiri
Proposed Methods
1. First-Mode Pushover Method
2. Multi-Mode Pushover Method
3. Mode Shape-Based Method
Evaluation of Proposed Methods
1. Comparison of Column Design
2. Calibration of Brace Model
3. Comparison with Inelastic Dynamic Analysis Results
Summary and Conclusions

KEYWORDS

ASCE SUBJECT HEADINGS

Bracing, Buckling, Steel frames, Columns, Seismic effects, Axial forces

AUTHOR KEYWORDS

Brace buckling, Concentrically braced frame, Vertical unbalanced force, Column design, Higher mode effects, Pushover analysis, Seismic

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ARTICLE DATA

Digital Object Identifier

http://dx.doi.org/10.1061/(ASCE)ST.1943-541X.0000377

PUBLICATION DATA

ISSN

0733-9445 (print)

1943-541X (online)

Publisher

American Society of Civil Engineers

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