Comparison of chevron and suspended-zipper braced steel frames

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Comparison of chevron and suspended-zipper braced steel frames
Yigit Ozcelik a, Afsin Saritas b,⁎, Patricia M. Clayton a
a Department of Civil, Architectural and Environmental Engineering, University of Texas at Austin, Austin, TX 78712, USA
b Department of Civil Engineering, Middle East Technical University, Ankara 06800, Turkey

a r t i c l e i n f o a b s t r a c t
Article history:
Received 22 June 2015
Received in revised form 14 November 2015
Accepted 8 December 2015
Available online xxxx

 

a b s t r a c t
Suspended-zipper braced frame is a modified configuration of chevron braced frame inwhich zipper columns are
added between story beams and a hat truss is attached between top two stories in order to redistribute the unbalanced
vertical forces emerging following the brace buckling to avoid the use of deep beams. In this study,
three- and nine-story chevron and suspended-zipper braced frames are analyzed to compare their seismic performances.
The beams, columns, braces and zipper columns are modeled using nonlinear force-formulation
frame elements and nonlinear geometric effects are included by utilizing corotational transformation. Nonlinear
static analyses are performed until reaching a roof drift ratio of 3% and a set of twenty ground motion records
scaled to match a 10% probability of exceedance in 50 years is used for nonlinear time-history analysis. The results
appear to indicate that the lateral load capacity and drift demands for both low-rise chevron and suspendedzipper
braced frames are very similar; however, the mid-rise chevron braced frame has a better performance
compared to the mid-rise suspended-zipper braced frame.

© 2015 Elsevier Ltd. All rights reserved.

 

Keywords:
Steel structures
Concentrically braced frames
Chevron braced frames
Suspended-zipper braced frames
Nonlinear static analysis
Nonlinear time-history analysis

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