Stability of beams in steel eccentrically braced frames

Date

2014-05-01

Author

Yigitsoy, Gul
Topkaya, Cem
Okazaki, Taichiro

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

232
views

0
downloads

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 of cyclically loaded EBFs. A total of 51 EBF sub-assemblage models, none of which satisfies the capacity design requirement, were selected and investigated through three-dimensional, nonlinear finite element analysis. The results indicate that the link overstrength factor should be a function of the link length for performing capacity design of the beam outside of the link This is because flexure yielding links, which are more problematic to beam stability, tend to develop smaller overstrength compared to shear yielding links. Furthermore, designs with demand-to-capacity ratios greater than unity were found to be viable provided that the stability of the beam is maintained by making use of a slenderness limit developed herein.

Subject Keywords

Eccentrically braced frame, Overstrength, Finite element, Nonlinear analysis, Steel

URI

https://hdl.handle.net/11511/40871

Journal

JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH

DOI

https://doi.org/10.1016/j.jcsr.2014.01.002

Collections

Department of Civil Engineering, Article

Suggestions

OpenMETU
Core

Comparison of chevron and suspended-zipper braced steel frames Ozcelik, Yigit; Sarıtaş, Afşin; Clayton, Patricia M. (2016-03-01) 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 no...
Stability of laterally unsupported shear links in eccentrically braced frames Özkılıç, Yasin Onuralp ; Zeybek, Ozer; Topkaya, Cem (2021-12-01) I-shaped links in eccentrically braced frames (EBFs) are susceptible to lateral or lateral torsional buckling when subjected to cyclic link rotations. Lateral bracing should be provided at the ends of the I-shaped links in order to prevent these failures. Requirements for such braces are available in widely used design specifications such as the AISC Seismic Provisions for Structural Steel Buildings (AISC341-16) and EC8. These requirements limit the use of I-shaped links in bridge piers and elevator shafts....
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-...
Vibration characteristics of various wide flange steel beams and columns Özel, Halil Fırat; Sarıtaş, Afşin; Tasbahjı, Tayseer (null; 2015-12-11) Vibration characteristics of steel framed structures are affected by accurate modelling of the mass and stiffness matrices of beam and column members. In this regards, wide flange sections are the most popularly used steel sections, and calculation of axial, flexural and shear responses of these sections become critical. In this study, a mixed formulation frame finite element is developed from three-fields Hu-Washizu-Barr functional. Consistent mass matrix of the element is obtained such that determination ...
Modeling of the nonlinear behavior of semi-rigid connections in steel framed structures and its influence on three dimensional analysis of structural systems Özel, Halil Fırat; Sarıtaş, Afşin; Department of Civil Engineering (2019) In steel frame structures, introducing the nonlinear force-deformation behavior of frame members with flexible joints will show closer results to the actual behavior. In this thesis, a mixed formulation frame finite element is developed from a nonlinear force-based method that can include localized semi-rigid connection response. The formulation of the element uses the three-fields Hu-Washizu-Barr principle, where displacement shape function approximation is omitted with the use of a force-based approach. T...

Citation Formats

G. Yigitsoy, C. Topkaya, and T. Okazaki, “Stability of beams in steel eccentrically braced frames,” JOURNAL OF CONSTRUCTIONAL STEEL RESEARCH, pp. 14–25, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/40871.