Comparison of chevron and suspended-zipper braced steel frames

Ozcelik, Yigit
Sarıtaş, Afşin
Clayton, Patricia M.
Suspended-zipper braced frame is a modified configuration of chevron braced frame in which 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 suspended zipper 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.


Numerical investigation of braces and replaceable links for steel frames
Kazemzadeh Azad, Sina; Topkaya, Cem; Department of Civil Engineering (2021-2-10)
Concentrically braced frames (CBFs) and eccentrically braced frames (EBFs) are among popular lateral load resisting systems for steel structures. The present study investigates different aspects of these systems. The part devoted to EBFs begins with a comprehensive review of research where 22 future research needs are identified and presented. This is followed by an experimental study on the low-cycle fatigue behavior of links, which are the most important members of an EBF. Results of the experimental stud...
Stability of beams in steel eccentrically braced frames
Yigitsoy, Gul; Topkaya, Cem; Okazaki, Taichiro (2014-05-01)
When an eccentrically braced frame (EBF) is subjected to a severe seismic event, large axial force and bending moments are produced in the beam outside of the link Designers face significant difficulties in meeting the capacity design requirement to keep these beams elastic. On the other hand, previous research suggests that controlled yielding in the beams is not detrimental to EBF performance as long as stability of the beam is maintained. A computational study was undertaken to investigate the stability ...
An Experimental Study on Welded Overlap CoreSteel Encased Buckling-restrained Braces
Bozkurt, Mehmet Bakır; Topkaya, Cem (null; 2017-09-13)
Buckling restrained braced frames (BRBFs) can be used as a lateral load resisting system in seismic regions. A typical buckling restrained brace (BRB) is composed of a core segment, debonding material and a buckling restraining mechanism (BRM). The cross‐section of the core segment can be changed along the length to constrain yielding in a limited domain. Most of the BRBs utilize a rectangular core segment which is reduced in width throughout yielding length. The gradual reduction in the width of the core s...
Seismic response of a single story innovative steel frame system
Dicleli, Murat (2005-01-01)
The presented research studies the seismic response of a new braced steel frame type and a new design philosophy that will focus on minimizing damage to the essential structural members and ensuring satisfactory post-earthquake performance of steel buildings under service loads with minimal rehabilitation costs. The proposed frame type is composed of beams and columns with rigid connections, chevron braces and a conventional energy-dissipating member called the shear element connected between the braces and...
Displacement amplification factors for steel eccentrically braced frames
Kusyilmaz, Ahmet; Topkaya, Cem (2015-02-01)
Inelastic deformation capacity of links is a factor that significantly influences design of steel eccentrically braced frames (EBFs). The link rotation angle is used to describe inelastic link deformation. The link rotation angle is generally calculated by making use of design story drifts that in turn are calculated by modifying the elastic displacements by a displacement amplification factor. This paper presents a numerical study undertaken to evaluate the displacement amplification factor given in ASCE7-...
Citation Formats
Y. Ozcelik, A. Sarıtaş, and P. M. Clayton, “Comparison of chevron and suspended-zipper braced steel frames,” JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, pp. 169–175, 2016, Accessed: 00, 2020. [Online]. Available: