Abstract
Seismic codes estimate the maximum displacements of building structures under the design-basis earthquakes by amplifying the elastic displacements under the reduced seismic design forces with a deflection amplification factor (DAF). The value of DAF is often estimated as ρ × R, where R is the force reduction factor and ρ is the inelastic displacement ratio that accounts for the inelastic action of the structure according to the definition presented by FEMA P695. The purpose of this study is to estimate the ρ-ratio of moment resisting steel frames (MRSFs) designed according to the Egyptian code. This is achieved by conducting a series of elastic and inelastic time-history analyses by two sets of earthquakes on four MRSFs designed according to the Egyptian code and having 2, 4, 8 and 12 stories. The earthquakes are scaled to produce maximum story drift ratios (MSDRs) of 1.0%, 1.5%, 2.0% and 2.5%. The mean values of the ρ-ratio are calculated based on the displacement responses of the investigated frames. The results obtained in this study indicate that the consideration of ρ for both the roof drift ratios (RDRs) and the MSDRs equal to 1.0 is a reasonable estimation for MRSFs designed according to the Egyptian code.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
ASCE 7-10 (2010), Minimum Design Loads for Buildings and Other Structures (ASCE/SEI 7-10), American Society of Civil Engineers, Reston, VA, USA.
COSMOS (2017), The Consortium of Organizations for Strong-Motion Observation Systems, http: //www. cosmos-eq.org/.
Durucan C and Gümüş M (2018), “Direct Use of Peak Ground Motion Parameters for the Estimation of Inelastic Displacement Ratio of SDOF Systems Subjected to Repeated Far Fault Ground Motions,” Earthquake Engineering and Engineering Vibration, 17(4): 771–785. https://doi.org/10.1007/s11803-018-0475-4.
ECP-201 (2012), Egyptian Code for Calculating Loads and Forces in Structural Work and Masonry, Housing and Building National Research Center, Ministry of Housing, Utilities and Urban Planning, Cairo.
Euro code 8 (2004), Design of Structures for Earthquake Resistance, part 1: General Rules, Seismic Actions, and Rules for Buildings, EN 1998-1, European Committee for Standardization, Brussels, Belgium.
FEMA (2009), Quantification of Building Seismic Performance Factors, FEMA P695, Prepared by the Applied Technology Council for the Federal Emergency Management Agency, Washington, D.C.
Iervolino I, Galasso C, Cosenza E (2010), “REXEL: Computer Aided Record Selection for Code-Based Seismic Structural Analysis,” Bulletin of Earthquake Engineering, 8: 339–362. Available at: https://doi.org/www.reluis.it/index.php.
Kuşyılmaz A and Topkaya C (2015), “Displacement Amplification Factors for Steel Eccentrically Braced Frames,” Earthquake Engineering & Structural Dynamics, 44: 167–184.
Mahmoudi M and Zaree M (2013), “Evaluating the Displacement Amplification Factors of Concentrically Braced Steel Frames,” International Journal of Advanced Structural Engineering, 5(13): 12.
Miranda E and Bertero VV (1994), “Evaluation of Strength Reduction Factors for Earthquake Resistant Design,” Earthquake Spectra, 10(2): 357–379.
Miranda E (2001), “Estimation of Inelastic Deformation Demands of SDOF Systems,” Journal of Structural Engineering, ASCE, 127: 1005–1012.
NBCC (2010), National Building Code of Canada. National Research Council of Canada, Ottawa, Ontario, Canada.
Samimifar M, Oskouei AV and Rofooei FR (2015), “Deflection Amplification Factor for Estimating Seismic Lateral Deformations of RC Frames,” Earthq Eng & Eng Vib, 14: 373–384.
SeismoStruct v7.0 (2014), A Computer Program for Static and Dynamic Nonlinear Analysis of Framed structures, available from https://doi.org/www.seismosoft.com.
Uang CM and Maarouf A (1994), “Deflection Amplification Factor for Seismic Design Provisions,” Journal of Structural Engineering, 120(8): 2423–2436.
Veletsos AS and Newmark NM (1960), “Effect of Inelastic Behavior on the Response of Simple Systems to Earthquake Motions,” Proc. 2nd World Conf. Earthquake Eng., Tokyo, Japan, 2: 895–912.
Zhai C, Li S, Xie L and Sun Y (2007), “Study on Inelastic Displacement Ratio Spectra for Near-Fault Pulse-Type Ground Motions,” Earthquake Engineering and Engineering Vibration, 6(4): 351–355. https://doi.org/10.1007/s11803-007-0755-x.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Abou-Elfath, H. Evaluating the inelastic displacement ratios of moment-resisting steel frames designed according to the Egyptian code. Earthq. Eng. Eng. Vib. 18, 159–170 (2019). https://doi.org/10.1007/s11803-019-0496-7
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11803-019-0496-7