Commenced in January 2007
Frequency: Monthly
Edition: International
Paper Count: 32009
Best Combination of Design Parameters for Buildings with Buckling-Restrained Braces

Authors: Ángel de J. López-Pérez, Sonia E. Ruiz, Vanessa A. Segovia


Buildings vulnerability due to seismic activity has been highly studied since the middle of last century. As a solution to the structural and non-structural damage caused by intense ground motions, several seismic energy dissipating devices, such as buckling-restrained braces (BRB), have been proposed. BRB have shown to be effective in concentrating a large portion of the energy transmitted to the structure by the seismic ground motion. A design approach for buildings with BRB elements, which is based on a seismic Displacement-Based formulation, has recently been proposed by the coauthors in this paper. It is a practical and easy design method which simplifies the work of structural engineers. The method is used here for the design of the structure-BRB damper system. The objective of the present study is to extend and apply a methodology to find the best combination of design parameters on multiple-degree-of-freedom (MDOF) structural frame – BRB systems, taking into account simultaneously: 1) initial costs and 2) an adequate engineering demand parameter. The design parameters considered here are: the stiffness ratio (α = Kframe/Ktotal), and the strength ratio (γ = Vdamper/Vtotal); where K represents structural stiffness and V structural strength; and the subscripts "frame", "damper" and "total" represent: the structure without dampers, the BRB dampers and the total frame-damper system, respectively. The selection of the best combination of design parameters α and γ is based on an initial costs analysis and on the structural dynamic response of the structural frame-damper system. The methodology is applied to a 12-story 5-bay steel building with BRB, which is located on the intermediate soil of Mexico City. It is found the best combination of design parameters α and γ for the building with BRB under study.

Keywords: Best combination of design parameters, BRB, buildings with energy dissipating devices, buckling-restrained braces, initial costs.

Digital Object Identifier (DOI):

Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 845


[1] 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.
[2] V. A. Segovia, and S. Ruiz, “Direct displacement-based design for buildings with hysteretic dampers, using best combinations of stiffness and strength ratios,” Journal of Earthquake Engineering, published on-line, 2016.
[3] AISC, Manual of Steel Construction, American Institute of Steel Construction, 14th Edition, Chicago Illinois, 2011.
[4] CoreBrace México, “Contravientos restringidos contra pandeo (CRP), Manual de información técnica y tablas de ayuda” (Buckling-restrained braces (BRB), Technical information manual and help tables), México D. F, 2016 (in Spanish).
[5] CSI, Analysis Reference Manual for ETABS 2015, Computers and Structures, Berkeley California, 2015.
[6] H. Nangullasmú, “Propuesta de criterios de diseño sísmico conforme a reglamento para marcos no dúctiles de concreto reforzado con disipadores histeréticos” (Proposal of seismic design criteria according to regulation for non-ductile reinforced concrete frames with hysteretic dissipation devices). Tesis de maestría, Universidad Autónoma Metropolitana, México D.F, 2011 (in Spanish).
[7] Normas técnicas complementarias para diseño por sismo. Gaceta official del Distrito Federal (Technical Regulation for Earthquake Resistant Design, Mexico City Building Code), 2004 (in Spanish).
[8] Chopra, Dynamics of Structures, Theory and Applications to Earthquake Engineering. Prentice Hall, Second Edition, 2001.