A Proposed Method to Satisfy Code Drift Criteria to Achieve Building with Higher Seismic Performance

Document Type : Research Article


International Institute of Earthquake Engineering and Seismology, Tehran, Iran


The first step in designing structures is choosing sufficient elements for the applied loads, including dead, live, wind and earthquake ones. Then, drifts of all stories are compared with allowable values and if required some structural elements are so resized to satisfy the drift criteria. The process of resizing is normally carried out by trial and error and relied mostly on engineering judgment. In other words, there are many approaches for satisfying the drift criteria, which some of them may lead to structures with poor seismic behavior. Moreover, based on Iranian Standard 2800, the designer is allowed to use analytical period of vibration in drift controlling process, instead on one calculated by the code proposed formula.
In this study, a method is proposed to find the best elements for resizing and subsequently satisfying the drift controlling criteria. Furthermore, it is shown that applying the analytical period of vibration leads to structures with better seismic behavior. For the purposes, Endurance Time method is applied in which nonlinear behavior of slender special moment resisting frame steel structures and their damage indices are considered.


Main Subjects

[1] Naeim, F.; Seismic Design Handbook, Kluwer Academic Publishers, 2001.
[2] Iranian Code of Practice for Seismic Resistant Design of Buildings, Standard No.2800-84, 3rd Edition, Building and Housing Research Center, 2005 (in persian).
[3] Mir-Kazemi, S. S; Mohammadi, M.; Investigating the influence and strengthening procedure due to drift controlling criteria on nonlinear seismic behavior of slender steel frames, Journal, journal of Sharif university of technology, 2-30(4.2)-pp. 53-63-2014 (in Persian).
[4] Afzal-Soltani, R.; Investigation of Applying Privacy Control Effects of Shifting on Seismic Behavior of Buildings, M.Sc. Thesis, International Institute of Earthquake Engineering and Seismology, Tehran, Iran,2012 (in Persian).
[5] Zou, X.K., Chan, C.M., An optimal resizing technique for seismic drift design of concrete buildings subjected to response spectrum and time history loadings,Computers and Structures, 83(19), pp. 1689-1704, 2005.
[6] Gholami, S.; A proposed method to satisfy code drift criteria to achieve SMRF slender buildings with higher seismic performance, M.Sc. Thesis, International Institute of Earthquake Engineering and Seismology,Tehran, Iran, 2013 (in Persian).
[7] Code No. 360; Instruction for Seismic Rehabilitation of Existing Buildings, 2007 (in persian).
[8] Estekanchi, H. E.; Vafai, A. and Sadeghazar, M.;Endurance Time Method for Seismic Analysis and Design of Structures, Scientia Iranica, 11(4), pp.361-370,2004.
[9] Estekanchi, H. E.; Vafai, A. and Riahi, H. T.; Endurance Time Method: from Ideation to Application,Proceedings of a U.S.–Iran Seismic Workshop, Irvine, California, pp.205–218, 2009.
[10] estekanchi, H. E et al; Recent advances in seismic assessment of structures by endurance time method, PEER, pp. 289-302, 2010.
[11] ASCE standard, Seismic rehabilitation of existing buildings, ASCE/SEI 41-06.
[12] Valamanesh, V.; Three-dimensional Non-linear Seismic Analysis of Buildings by Endurance Time Method, Ph.D.Thesis, Sharif University of Technology, Tehran, Iran,2010 (in Persian).
[13] Federal Emergency Management Agency, Improvement of Nonlinear Static Seismic Analysis Procedure, FEMA 440.
[14] Firouzbakht, M.; Vosoughifar, H. R. and Erfani, S.;Introduction of a High Performance Seismic Damage Index from Existing Analytical Indicators, Journal of Seismology and Earthquake Engineering, Vol. 13, Nos.1–2, pp. 23–34, 2010 (in Persian).
[15] Park, Y. J.; Reinhorn, A. M. and Kunnath, S. K.; Seismic Damage Analysis of Reinforced Concrete Buildings, Proceeding of 9th World Conference on Earthquake Engineering, Tokyo, Japon, Vol. 8, 1988.
[16] Iranian National Building Code, Part 10: Design and Construction of steel buildings, 2009 (in Persian).
[17] ETABS Nonlinear V9.7.4. Extended 3D analysis of building system, Computers and Structures Inc, CA,2011.
[18] Iranian National Building Code, Part 6: Loads in buildings, 2009 (in Persian).
[19] PERFORM-3D V4.0.3. Nonlinear analysis and performance assessment of 3D structures, Computers and Structures Inc, CA, 2007.
[20] Chopra, A.K. Dynamics of Structures, university of California, Second Edition, New Delhi, 2002.