Journal of Seismology and Earthquake Engineering

Journal of Seismology and Earthquake Engineering

Effect of High Axial Load on Overstrength Factor of Intermediate Links in EBFs

Document Type : Research Article

Authors
Zahra Ghafari 1
Masood Mojarad 2
Maryam Daei 3
1 M.Sc. Student, Department of Civil Engineering, Faculty of Civil Engineering and Transportation, University of Isfahan, Isfahan, Iran
2 Ph.D. Student, Department of Civil Engineering, Faculty of Civil Engineering and Transportation, University of Isfahan, Isfahan, Iran
3 Associate Professor, Department of Civil Engineering, Faculty of Civil Engineering and transportation, University of Isfahan, Isfahan, Iran
10.48303/jsee.2024.2030587.1094
Abstract
Eccentric bracing frames (EBFs) are one of the most suitable seismic resistance systems due to their high strength, ductility, and energy dissipation. In some EBF configurations, due to loading patterns or structural geometry, the link member can be subjected to a high axial load. The presence of high compressive axial loads increases the occurrence of buckling and thus reduces both its strength and ductility. Most of the studies conducted have focused on short links, and as mentioned in the commentary of the AISC seismic regulations, the effect of axial load on the behavior of intermediate and long links has not been sufficiently investigated, which highlights the need for further study. In this research, numerical modeling is first validated by experimental results. Subsequently, the overstrength factor of intermediate links made from European I-shaped sections subjected to axial loads is examined. The results indicate that the overstrength factor of intermediate links is lower than the prescribed value of 1.5 in the provisions.
Keywords
Eccentrically braced frame
Intermediate link
Overstrength factor
High axial load
Finite element modelling
Subjects
Almasabha, G. (2022). Gene expression model to estimate the overstrength ratio of short links. Structures, 45, 761-774.
 American Institute of Steel Construction. (2016). Seismic Provisions for Structural Steel Buildings (ANSI/AISC 341-16).
 Arce, G. (2002). Impact of Higher Strength Steels on Local Buckling and Overstrength of Links in Eccentrically Braced Frames [Ph.D. Dissertation, University of Texas at Austin].
 Aziz, I., & Amanat, K. M. (2022). Equivalence of plastic strength and hysteretic behavior of box and I-shaped shear links. Structures, 37, 514-529.
 Dassault Systèmes. (2014). ABAQUS Standard User's Manual (Version 6.14).
Dastmalchi, S. (2014). Numerical Study of Axial   Load Effect on the Seismic Behavior of Shear Links in Eccentrically Braced Frames. Ph.D. Dissertation, University of Maryland, College Park.
 Della Corte, G., D'Aniello, M., & Landolfo, R. (2013). Analytical and numerical study of plastic overstrength of shear links. Journal of Constructional Steel   Research, 82, 19-32.
 Engelhardt, M. D., & Popov, E. P. (1992). Experimental performance of long links in eccentrically braced frames. Journal of Structural Engineering, 118(11), 3067-3088.
 European Committee for Standardization. (2005). *EN 1993-1-1: Eurocode 3: Design of Steel Structures - Part 1-1: General Rules and Rules for Buildings*.
 European Committee for Standardization. (2005). Eurocode 8: Design of structures for earthquake resistance - Part 1: General rules, seismic actions and rules for buildings (EN 1998-1).
 Ghafari, Z., Mojarad, M., & Daei, M. (2024). Overstrength factor of intermediate link subjected to high axial load in EBFs [Paper presentation]. 9th International Conference on Seismology and Earthquake Engineering, Tehran, Iran.
 Hu, S., Xiong, J., Zhou, Q., & Lin, Z. (2018). Analytical and numerical investigation of over- strength factors for very short shear links in EBFs. KSCE Journal of Civil Engineering, 22(11), 4473-4482.
 Kasai, K., & Popov, E. P. (1986a). Cyclic web buckling control for shear link beams. Journal of Structural Engineering, 112(3), 505-523.
 Kasai, K., & Popov, E. P. (1986b). General behavior of WF steel shear link beams. Journal of Structural Engineering, 112(2), 362-382.
 Kaufmann, E. J., Metrovich, B., & Pense, A. W. (2001). Characterization of cyclic inelastic strain   Behavior on Properties of A572 Gr. 50 and A913 Gr. 50 Rolled Sections: Final Report to American Institute of Steel Construction. Lehigh University.
 Liu, X.-G., Fan, J.-S., Liu, Y.-F., Zheng, M.-Z., & Nie, J.-G. (2020). Theoretical research into cyclic web buckling and plastic overstrength of shear links. Thin-Walled Structures, 152, 106644.
 Manganiello, L., Montuori, R., Nastri, E., & Piluso, V. (2021). The influence of the axial restraint on the overstrength of short links. Journal of Con-structional Steel Research, 184, 106758.
 Manheim, D. N., & Popov, E. P. (1983). Plastic shear hinges in steel frames. Journal of Structural Engineering, 109(10), 2404-2419.
 Mohebkhah, A., & Azandariani, M. G. (2020). Shear resistance of retrofitted castellated link beams: Numerical and limit analysis approaches. Engineering Structures, 203, 109864.
 Mohebkhah, A., & Chegeni, B. (2014). Overstrength and rotation capacity for EBF links made of  European IPE sections. Thin-Walled Structures, 74, 255-260.
 Mojarad, M., Daei, M., & Hejazi, M. (2017). Optimal stiffeners spacing for intermediate link in eccentrically braced frame to increase energy dissipation. AUT Journal of Civil Engineering, 1(1), 39-44.
 Mojarad, M., Daei, M., & Hejazi, M. (2019). Study of stiffeners geometry effects on increasing energy absorption of different types of link beam in eccentrically braced frame. Journal of Structural and Construction Engineering, 6(3), 48-63.
 Mojarad, M., Daei, M., & Hejazi, M. (2020). Optimal design parameters of stiffeners for improving seismic performance of links in EBFs. International Journal of Steel Structures, 20(6), 1765-1782.
 Okazaki, T., Arce, G., Ryu, H.-C., & Engelhardt, M. D. (2005). Experimental study of local buckling, overstrength, and fracture of links in eccentrically braced frames. Journal of Structural Engineering, 131(10), 1526-1535.
 Okazaki, T., Engelhardt, M. D., Drolias, A., Schell, E., Hong, J.-K., & Uang, C.-M. (2009). Experimental investigation of link-to-column connections in eccentrically braced frames. Journal of Constructional Steel Research, 65(7), 1401-1412.
 Ozkilikç, Y. O. (2022). Interaction of flange and web slenderness, overstrength factor and proposed stiffener arrangements for long links. Journal of Constructional Steel Research, 190, 107150.
 Richards, P. W. (2004). Cyclic Stability and Capacity Design of Steel Eccentrically Braced Frames. Ph.D. Dissertation, University of California, San Diego.
 Tashakori, J., Razzaghi, J., & Ansari, S. (2019). Reassessment of current design criteria of plastic hinges in shear links. Journal of Constructional Steel Research, 158, 350-365.
Journal of Seismology and Earthquake Engineering
Volume 27, Issue 1
Winter 2025
Pages 49-56

  • Receive Date 29 May 2024
  • Revise Date 01 July 2024
  • Accept Date 21 August 2024
  • Publish Date 01 January 2025