Damping of Steel Eccentrically Braced Frames in Direct Displacement-Based Design

Document Type : Research

Authors

1 Assistant Professor, Department of Civil Engineering, Ardabil Branch, Islamic Azad University, Ardabil, Iran,

2 Adjunct Professor, Civil Engineering Department, School of Engineering, Morgan State University, Baltimore, Maryland, USA

Abstract

Due to the limitations and deficiencies in the force-based design approach, several methods are introduced and examined in order to improve this methodology. However, over the years, researchers have proposed displacement-based design methods. Among them, the direct displacement-based design (DDBD) method is one of the most thorough and accepted. The main goal of this method is to determine equivalent damping. Considering the equivalent damping and target displacement corresponding to the desired ductility, the design base shear is obtained from the displacement spectrum. Several methods are proposed to determine  equivalent damping. In this study, the revised effective mass (REM) method is employed for the design of eccentrically braced frame (EBF) systems. Using this method, equivalent damping is determined for EBF’s. An expression is proposed for determining the equivalent damping for EBF’s in term of ductility.

Keywords

References

1. Priestley, M. J. N (1993). "Myths and Fallacies in Earthquake Engineering Conflicts between design and Reality", Bulletin of the New Zealand National Society for Earthquake Engineering, Vol. 26, No. 3, PP. 329-341. [DOI:10.5459/bnzsee.26.3.329-341]
2. Kowalsky, M.J., Priestley, M.J.N. and MacRae, G.A. (1994). "Displacement-based design: a methodology for seismic design applied to single degree of freedom reinforced concrete structures", Structural Systems Research Report 1994, University of California, San Diego.
3. Calvi, G. M. and Kingsley, G. R. (1995). "Displacement-Based Seismic Design of Multi-
4. Degree-of-Freedom Bridge Structures", Earthquake Engineering and Structural Dynamics, Vol. 24, PP. 1247-1266.
5. Kowalsky, M. J. (2002). "A Displacement-Based Approach for the Seismic Design of Continuous Bridges", Earthquake Engineering and Structural Dynamics, Vol. 31 No. 3, PP. 719-747. [DOI:10.1002/eqe.150]
6. Priestley, M. J. N. and Calvi, G. M. (2003). "Direct Displacement-Based Seismic Design of Concrete Bridges" ACI 2003 International Conference: Seismic Bridge Design
7. And Retrofit for Earthquake Resistance, December 8-9, 2003, La Jolla, CA.
8. Adhikari, G., Petrini, L. and Calvi, G. M. (2010). "Application of direct displacement based design to long span bridges", Bulletin of Earthquake Engineering, Vol. 8, No. 4, PP. 897-919. [DOI:10.1007/s10518-010-9173-y]
9. Calvi, G. M. and Pavese, A. (1995). "Displacement-Based Design of Building Structures" European Seismic Design Practice: Research and Application, Proceedings
10. of the Fifth SECED Conference, Elnashai, A.S. (Ed.), Chester, United Kingdom, October 26-27 1995, A.A. Balkema, Rotterdam, PP. 127-132.
11. Priestley, M. J. N. (1997). "Displacement-Based seismic assessment of reinforced concrete buildings", Journal of Earthquake Engineering, Vol. 1, No. 1, PP. 157-192. [DOI:10.1080/13632469708962365]
12. Harris, J L. (2004). "Comparison of steel moment frames designed in accordance with force-based and direct displacement-based design", Proceedings SEAOC Convention, August, Monterey, Canada.
13. Yavas, A. (2006). "Displacement profile for displacement based design of dual frame systems", 4th International Conference on Earthquake Engineering, Taipei, PP. 12-23, October 2006.
14. Garcia, R., Sullivan, T. J. and Corte, G. D. (2010). "Development of a displacement-based design method for steel frame-Rc wall buildings", Journal of Earthquake Engineering, Vol. 14, No. 2, PP. 252-277. [DOI:10.1080/13632460902995138]
15. Wijesundara, K. K., Nascimbene, R. and Sullivan, T. J. (2011). "Equivalent viscous damping for steel concentrically braced frame structures", Bulletin of earthquake engineering, Vol. 9, No. 5, PP. 1535-1558. [DOI:10.1007/s10518-011-9272-4]
16. Yahyai, M. and Rezayibana, B. (2017). "New expressions to estimate damping in direct displacement based design for special concentrically-braced frames", Numerical method in Civil Engineering, Vol. 1, No. 3, PP. 34-45.
17. Jacobsen, L. S. (1960). "Damping in composite structures.", In: Proceedings of 2nd world conference on earthquake engineering, vol. 2, Tokyo and Kyoto, Japan, PP. 1029-1044.
18. Dwairi, H. and Kowalsky, M. J. (2004). "Investigation of Jacobsen's equivalent viscous damping approach as applied to displacement-based seismic design", Proceeding of 13th World Conference on Earthquake Engineering, August 1-6 Vancouver, BC, Canada.
19. Grant, D. N., Blandon, C. A. and Priestley, M. J. N. (2005). Modeling inelastic response in direct displacement-based design, Report 2005/03, IUSS Press, Pavia.
20. Dwairi, H., Kowalsky, M. J. and Nau, J. M. (2007). "Equivalent damping in support of direct displacement-based design", Journal of Earthquake Engineering, Vol. 11, No. 4, PP. 512-530. [DOI:10.1080/13632460601033884]
21. Yahyai, M. and Rezayibana, B. (2015). "A Simplified Methodology to Determine Damping for Special Concentrically-Braced Frames", International journal of steel structures, Vol. 15, No. 3, PP. 541-555. [DOI:10.1007/s13296-015-9003-9]
22. AISC (2016). Seismic provisions for structural steel buildings, An American National Standard, ANSI/AISC 341-10, American Society of Civil Engineers, Chicago
23. ABAQUS. 2012. ABAQUS Theory Manual and Users' Manual, Version 12.6. Hibbitt, Karlsson & Sorenson, Inc.
24. Berman, J. W and Bruneau, M. (2007), "Experimental and analytical investigation of tubular links for eccentrically braced frames", Engineering Structures Vol. 29, No. 8, PP.1929-1938. [DOI:10.1016/j.engstruct.2006.10.012]
25. ASCE (2010). Minimum design loads for buildings and other structures, An ASCE Standard, ASCE/SEI 7-10. American Society of Civil Engineers, Reston
26. Berkeley.
27. Priestley, M. J. N., Calvi, G. M. and Kowalsky, M.J. Displacement-Based Design of Structures, 2007, IUSS
Numerical Methods in Civil Engineering
Volume 2, Issue 4
June 2018
Pages 48-56

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History

  • Receive Date: 29 January 2018
  • Revise Date: 15 May 2018
  • Accept Date: 09 June 2018

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