Evaluation of seismic performance of steel frames with Y-shape braces under far-field and near-field earthquakes

Najafi, Saeed; Borzoo, Shahin; Saboohian, Kaveh; Aboutalebi, Hadi

doi:10.61186/NMCE.2505.1088

Evaluation of seismic performance of steel frames with Y-shape braces under far-field and near-field earthquakes

Document Type : Research

Authors

Saeed Najafi ¹

Shahin Borzoo ²

Kaveh Saboohian ³

Hadi Aboutalebi ⁴

¹ PhD Student, Department of Earthquake Engineering, Tarbiat Modares University, Tehran, Iran

² Assistant professor, Civil Engineering Department, Technical University of Buein Zahra, Buein Zahra, Qazvin, Iran

³ PhD Student, Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

⁴ PhD Student, Department of Civil Engineering, Shahrkurd Branch, Islamic Azad University, Shahrkurd, Iran.

10.61186/NMCE.2505.1088

Abstract

In this study, the finite element modeling of the Y-shape bracing system is initially developed and verified. Next, the seismic performance of steel frames with Y-shape braces under far-field and near-field earthquakes was evaluated. For this purpose, seismic analysis was performed using 12 seismic records including near-field and far-field on 4, 8, and 12-floor structures equipped with and without Y-shape bracing. A series of time history analyses were performed on the samples, which led to the precise review of the Y-shape bracing system. The results show that structures equipped with Y-shape braces have less lateral displacement and also less number and level of plastic hinges; and, the level of non-linear dissipated energy is higher in those structures. Also, the plastic hinges based on the failure indices of the structures indicate that - near-field earthquakes have a more destructive effect of about 20% higher than far earthquakes on structures equipped with Y-shape bracing. Y-shaped bracing has reduced the permanent displacement in the system by up to 30%.

Keywords

Nonlinear dynamic analysis

Y-shape bracing

near-field and far-field Earthquake

Nonlinear dissipated energy

Plastic hinge

Subjects

Structural Engineering

[1] F. Farheen and S. P. Akshara, “Comparison of Seismic Performance of Knee Braces in Steel Frames with Y Shaped Eccentric Braces,” in National Conference on Structural Engineering and Construction Management, 2019, pp. 551–562.

[2] E. P. Popov, K. Kasai, and M. D. Engelhardt, “Advances in design of eccentrically braced frames,” Earthquake Spectra, vol. 3, no. 1, pp. 43–55, 1987.

[3] S. Najafi, K. Saboohian, and S. Borzoo, “The Effect of Y-Shaped Brace Configuration on Its Seismic Behavior,” International Journal of Steel Structures, pp. 1–19, 2022.

[4] P. Heinemann and D.-N. Isopescu, “Experimental and Numerical Case Studies about Two-Dimensional CHS Joints with a Symmetrical Y-Shape,” Materials, vol. 15, no. 9, p. 3179, 2022.

[5] S. M. Zamani, A. Vafaei, A. A. Aghakouchak, and C. Desai, “Experimental investigation of steel frames braced with symmetrical pairs of y-shaped concentric bracings,” International Journal of Steel Structures, vol. 11, no. 2, pp. 117–131, 2011.

[6] M. R. S. Nezhad and M. M. Sahebi, “A numerical and experimental seismic study on the ductile tubular elements and their performance in Y-Shaped braces,” in Structures, Elsevier, 2022, pp. 737–749.

[7] M. Ghiasvandand, M. Alirezaei, S. M. Mirhosseini, and E. Zeighami, “Experimental and parametric study of a novel braced system to improve seismic performance,” in Structures, Elsevier, 2022, pp. 229–242.

[8] A. Shahiditabar, H. Moharrami, and H. H. Snijder, “Quantification of seismic performance factors of self-centered y-shaped braced frames,” J Constr Steel Res, vol. 194, p. 107304, 2022.

[9] F. M. Mazzolani, G. Della Corte, and G. Cantisani, “Seismic Upgrading of an Existing Steel Structure Using Inverted Y-braces,” in International Conference on the Behaviour of Steel Structures in Seismic Areas, Springer, 2022, pp. 890–897.

[10] T. Li, M. Su, Y. Sui, and L. Ma, “Real-time hybrid simulation on high strength steel frame with Y-shaped eccentric braces,” Eng Struct, vol. 226, p. 111369, 2021.

[11] Y. Minaei, M. Mashayekhi, and M. Sarcheshmehpour, “Incremental Dynamic Analysis of Mid-Rise Buildings with Buckling Restrained Brace Frame System under Pulse-Like Near-Fault Ground Motions,” Journal of Rehabilitation in Civil Engineering, pp. 47–67, 2025.

[12] A. Majdi, M. Mashayekhi, and A. Sadeghi-Movahhed, “Effect of near-fault earthquake characteristics on seismic response of mid-rise structures with triple friction pendulum isolator,” Journal of Rehabilitation in Civil Engineering, vol. 12, no. 1, pp. 47–62, 2024.

[13] H. A. Moghaddam and H. Estekanchi, “On the characteristics of an off-centre bracing system,” J Constr Steel Res, vol. 35, no. 3, pp. 361–376, 1995.

[14] S. M. Zamani, A. Vafaei, C. Desai, and M. Rasouli, “Experimental investigation of behavior of steel frames with y-shaped concentric bracing,” J Constr Steel Res, vol. 70, pp. 12–27, 2012.

[15] British Standard EN10025-2, “Hot rolled products of structural steels—,” 2004.

[16] M. Bahirai, M. Gerami, and V. Bahaari Zargar, “Postannealing mechanical properties of structural steel St37,” Journal of Materials in Civil Engineering, vol. 32, no. 7, p. 04020152, 2020.

[17] S. Gorai and D. Maity, “Seismic response of concrete gravity dams under near field and far field ground motions,” Eng Struct, vol. 196, p. 109292, 2019.

[18] AISC, Seismic provisions for structural steel buildings, no. 2. American Institute of Steel Construction, 2016.