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http://dx.doi.org/10.12989/eas.2017.12.4.437

Identifying stiffness irregularity in buildings using fundamental lateral mode shape  

Vijayanarayanan, A.R. (Department of Civil Engineering, Indian Institute of Technology Madras)
Goswami, Rupen (Department of Civil Engineering, Indian Institute of Technology Madras)
Murty, C.V.R. (Department of Civil Engineering, Indian Institute of Technology Madras)
Publication Information
Earthquakes and Structures / v.12, no.4, 2017 , pp. 437-448 More about this Journal
Abstract
Soft or extreme soft storeys in multi-storied buildings cause localized damage (and even collapse) during strong earthquake shaking. The presence of such soft or extremely soft storey is identified through provisions of vertical stiffness irregularity in seismic design codes. Identification of the irregularity in a building requires estimation of lateral translational stiffness of each storey. Estimation of lateral translational stiffness can be an arduous task. A simple procedure is presented to estimate storey stiffness using only properties of fundamental lateral translational mode of oscillation (namely natural period and associated mode shape), which are readily available to designers at the end of analysis stage. In addition, simplified analytical expressions are provided towards identifying stiffness irregularity. Results of linear elastic time-history analyses indicate that the proposed procedure captures the irregularity in storey stiffness in both low- and mid-rise buildings.
Keywords
modal analysis; mass participation; open storey; soft storey; storey stiffness;
Citations & Related Records
Times Cited By KSCI : 4  (Citation Analysis)
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1 Akkar, S., Yazgan, U. and Gulkan, P. (2005), "Drift estimate in framed building subjected to near-fault ground motions", J. Struct. Eng., 131(7), 1014-1024.   DOI
2 Ambrose, J. and Vergun, D. (1995), Simplified Building Design for Wind and Earthquake Forces, John Wiley & Sons, New Jersey.
3 Arnold, C. (2001), Architectural Consideration (Chapter 6), The Seismic Design Handbook, Second Edition, (Naeim F. Editor) Kluver Adademic Publisher, Norwell, MA, 282-289.
4 ASCE 7-10 (2010), Minimum Design Loads for Buildings and Other Structures, 2nd Edition, American Society of Civil Engineers, Reston, Virginia, United States.
5 Caterino, N., Cosenza, E. and Azmoodeh, B.M. (2013), "Approximate methods to evaluate storey stiffness and interstory drift of RC buildings in seismic area", Struct. Eng. Mech., 46(2), 245-267.   DOI
6 CSI Structural Analysis Program (SAP) 2000 Version 15 (2014), Computers and Structures Inc., USA.
7 Das, S. and Nau, J.M. (2001), "Seismic design aspects of vertically irregular reinforced concrete buildings", Earthq. Spectra, 19(3), 455-477.   DOI
8 Earthquake-Resistant Structures - Design, Assessment and Rehabilitation, Available from: http://cdn.intechopen.com/pdfswm/30134.pdf.
9 FEMA 454 (2006), Designing for Earthquakes: A Manual for Architects, EERI, USA.
10 Harmankaya, Z.Y. and Soyluk, A. (2012), "Architectural design of irregular buildings in turkey", Int. J. Civ.Envir. Eng. IJCEEIJENS, 12(1), 42-48.
11 Hosseini, M. and Imagh-e-Naiini, M.R. (1999), "A quick method for estimating the lateral stiffness of building systems", Struct. Des. Tall Build., 8(3), 247-260.   DOI
12 IBC 2010 (2010), International Code Council (ICC) International Building Code, Birmingham, AL, USA.
13 IITK-GSDMA Guidelines for Proposed Draft Code and Commentary on Indian Seismic Code IS:1893 (Part 1), IITKGSDMA-EQ05-V4.0 (2005), Indian Institute of Technology Kanpur and Gujarat State Disaster Mitigation Authority, Gandhinagar, India.
14 IS:1893 (Part 1) Indian Standard Criteria for Earthquake Resistant Design of Structures (2002), Bureau of Indian Standards, New Delhi.
15 Paulay, T. and Priestley, M.J.N. (1992), Seismic Design of Reinforced Concrete and Masonry Buildings, John Wiley & Sons, New York.
16 Murty, C.V.R., Goswami, R., Vijayanarayanan, A.R. and Mehta V.V. (2012), Some Concepts in Earthquake Behavior of Buildings, Gujarat State Disaster Management Authority, Gandhinagar, 190-195.
17 Muto, K. (1974), Aseismic design analysis of buildings. Maruzen Company, Ltd, Tokyo.
18 NZS 1170.5:2004 (2004), Structural Design Actions, Part 5: Earthquake Actions- New Zealand, Published by Standards New Zealand, New Zealand.
19 Saiful, I., Hussain, R.R., Jumaat, M.Z. and Mahfuz ud Darain, K. (2014), "Implication of rubber-steel bearing nonlinear models on soft storey structures", Comput. Concrete, 13(5), 603-619.   DOI
20 Schultz, A.E. (1992), "Approximating lateral stiffness of storeys in elastic frames", J. Struct. Eng., ASCE, 118(1), 243-263.   DOI
21 SEAOC Seismology Committee (1975 and 1988), Recommended Lateral Force Requirements and Commentary, Structural Engineers Association of California, Sacramento, CA, USA.
22 Tabeshpour, M.R. and Noorifard, A. 2016, "Comparing calculation methods of storey stiffness to control provision of soft storey in seismic codes", Earthq. Struct., 11(1), 1-23.   DOI
23 Tabeshpour, M.R., Azad, A. and Golafshani, A.A. (2012), Seismic Behavior and Retrofit of Infilled Frames, INTECH Open Access Publisher.
24 Tagawa, H., Macrae, G. and Lowes, L. (2004), "Evaluations of 1-D simple structural models for 2D steel frame structure", 13th World Conference on Earthquake Engineering, Vancouver, Canada, Paper No:1863.
25 Vijayanarayanan, A.R., Goswami, R. and Murty, C.V.R. (2015), "Identifying stiffness irregularity in multi-storey buildings", ICI J., 16(3), 19-22.
26 Varughese, J.A., Menon, D. and Prasad, A.M. (2015), "Displacement-based seismic design of open ground storey buildings", Struct. Eng. Mech., 54(1), 19-33.   DOI