Modern Seismic Design Approach for Buildings with Hysteretic Dampers

Authors: Vanessa A. Segovia, Sonia E. Ruiz

Abstract:

The use of energy dissipation systems for seismic applications has increased worldwide, thus it is necessary to develop practical and modern criteria for their optimal design. Here, a direct displacement-based seismic design approach for frame buildings with hysteretic energy dissipation systems (HEDS) is applied. The building is constituted by two individual structural systems consisting of: 1) a main elastic structural frame designed for service loads; and 2) a secondary system, corresponding to the HEDS, that controls the effects of lateral loads. The procedure implies to control two design parameters: a) the stiffness ratio (α=Kframe/Ktotal system), and b) the strength ratio (γ=Vdamper/Vtotal system). The proposed damage-controlled approach contributes to the design of a more sustainable and resilient building because the structural damage is concentrated on the HEDS. The reduction of the design displacement spectrum is done by means of a damping factor (recently published) for elastic structural systems with HEDS, located in Mexico City. Two limit states are verified: serviceability and near collapse. Instead of the traditional trial-error approach, a procedure that allows the designer to establish the preliminary sizes of the structural elements of both systems is proposed. The design methodology is applied to an 8-story steel building with buckling restrained braces, located in soft soil of Mexico City. With the aim of choosing the optimal design parameters, a parametric study is developed considering different values of હ and ઻. The simplified methodology is for preliminary sizing, design, and evaluation of the effectiveness of HEDS, and it constitutes a modern and practical tool that enables the structural designer to select the best design parameters. 

Keywords: Damage-controlled buildings, direct displacementbased seismic design, optimal hysteretic energy dissipation systems

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1100829

References:

[1] S. Mahin, “Lessons from steel buildings damaged by the Northridge earthquake,” Engineering Structures, vol. 20, nº 4, pp. 261-270, 1998.
[2] J. Kim, and Y. Seo, “Seismic design of low-rise steel frames with buckling-restrained braces,” Engineering Structures , vol. 26, pp. 543- 551, 2004.
[3] A. Teran-Gilmore, and N. Virto, “Preliminary design of low-rise buildings stiffened with buckling-restrained braces by a displacementbased approach,” Earthquake Spectra, vol. 25, pp. 185-211, 2009.
[4] C. Fleming, “A design methodology for hysteretic dampers in buildings under extreme earthquakes”. Master Thesis, Massachusetts Institute of Technology, 2004.
[5] J. Connor, Introduction to Structural Motion Control. MIT-Prentice Hall Pearson Education Series, 2003.
[6] R. Vargas, and M. Bruneau, “Analytical response and design of buildings with metallic structural fuses I,” Journal of Structural Engineering, vol. 135, nº 4, pp. 386-393, 2009.
[7] M.J.N. Priestley, G.M. Calvi, and M.J. Kowalsky, Displacement-Based Seismic Design of Structures. Pavia, IUSS PRESS, 2007.
[8] J. Connor, A. Wada, M. Iwata, and Y.H Huang, “Damage-controlled structures. I: Preliminary design methodology for seismically active regions,” Journal of Structure Engineering, vol. 123(4), pp. 423–431, 1997.
[9] Y. Bozorgnia, and V. Bertero, Earthquake Engineering: From Engineering Seismology to Performance-Based Engineering. CRC Press, 2004.
[10] Normas tecnicas complementarias para diseño por sismo. Gaceta oficial del Distrito Federal (Technical Regulation for Earthquake Resistant Design, Mexico City Building Code), 2004. (in Spanish)
[11] Chopra, Dynamics of Structures, Theory and Applications to Earthquake Engineering. Prentice Hall, Second Edition, 2001.
[12] T. Castillo, and S.E. Ruiz, “Factor de reducción por amortiguamiento para el diseño sísmico de estructuras con disipadores de energía,” (Damping reduction factor for seismic design of structures with energy dissipation devices), Serie de Investigacion y Desarrollo del Instituto de Ingenieria, Universidad Nacional Autonoma de Mexico, No.682, Mexico, D.F, 2013 (in Spanish).
[13] K. Inoue, and S. Kuwahara, “Optimum strength ratio of hysteretic damper,” Earthquake Engineering Structural Dynamics, vol. 27, pp. 577–588, 1998.