Investigating the Behavior of Buildings under the Effect of the New Design Ground Motion of Iraq

Mustafa Shakir Farman, AbdulMuttalib Isa Said


Recently, Iraq has experienced an increase in seismic activity, especially, near the east boundary with Iran which enhanced the need to study its effect on the behavior of buildings. In this study, a comprehensive methodology was applied to investigate the behavior of a moment frame system with respect to its height after subjected to the design ground motion at Baghdad according to the recently developed seismic hazard maps and, after developing and designing the required configurations of archetype models, specifying life safety as an aimed performance level, modeling nonlinearity and applying the nonlinear static analysis (NSP) according to ASCE/SEI41-13, FEMA356 and FEMA P-695. This methodology is started by sizing members cross-sectional dimensions and applying reinforcement detailing requirements according to ACI318-14. Results show that, for a given building height and number of bays, inelastic drifts increase with decreasing the bay width because the overall building stiffness is decreased and it will be more slender, and consequently, the P- delta effects increased. Also, as the building height increased, both, target and minimum shear capacities decrease and the target displacement increases under the effect of the same earthquake ground motion. Consequently, a necessary limitation on the height of these buildings were deduced to ensure their ability to withstand the future ground shaking and, in the same time, maintaining the life safety performance level of damage. Where, it is found that the maximum allowed heights of framed buildings in Baghdad are 17, 25 and 32 stories for 6, 7.5 and 9 m bay widths, respectively.


NSP; Baghdad; Moment Frame System; Inelastic Drifts; Shear Capacity; Height.


AbdulMuttalib Isa Said and Mustafa Shakir Farman, "Re-evaluations of seismic hazard of Iraq", Arabian Journal of Geosciences, 11(11) (June 2018) :1-19. doi: 10.1007/s12517-018-3558-7.

Farman, Mustafa Shakir, and AbdulMuttalib Isa Said. “Updated Probabilistic Seismic Hazard Assessment for Iraq/2018.” Civil Engineering Journal 4, no. 7 (July 30, 2018): 1610. doi:10.28991/cej-0309199.

NIST (2016), " Seismic Design of Reinforced Concrete Special Moment Frames: A guide for practicing engineers, NEHRP Seismic Design Technical Brief No. 1, Second Edition, NIST GCR 16-917-40, produced by the Applied Technology Council and the Consortium of Universities for Research in Earthquake Engineering for the National Institute of Standards and Technology, Gaithersburg, MD.

ASCE 7-5, "Minimum Design Loads for Buildings and Other Structures", American Society of Civil Engineers, Reston, Virginia, (2005).

Iraqi Seismic Code Requirements for Buildings, Code 2016, 1st edition, C.O.S.Q.C., Baghdad, Iraq.

Iranian Code of Practice for Seismic Resistant Design of Buildings (2007), Standard No. 2800, 3rd Edition, Building and Housing Research Center, Tehran, Iran.

TEC, "Specification for Buildings to be Built in Seismic Zones", Turkish Earthquake Design Code, Turkish Republic, Ministry of Public Works and Settlement, Ankara, (2007).

FEMA P-695, "Quantification of building seismic performance factors", prepared by the Applied Technology Council (ATC) for the Federal Emergency Management Agency, Washington, DC, (2009b).

Haselton, C.B., Deierlein, G.G., "Assessing Seismic Collapse Safety of Modern Reinforced Concrete Moment-Frame Buildings", PEER Report 2007/08, Pacific Earthquake Engineering Research Center, College of Engineering, University of California, Berkeley, February 2008.

ICS 91.080.040 (2016), "Criteria for Structural Safety of Tall Buildings", Bureau of Indian Standards, Draft Indian Standard.

IS 1893 (Part 1), "Criteria for earthquake resistant design of structures", Bureau of Indian Standards, Indian Standard No. 1893, Part 1: General provisions and buildings. Bldg.%20Earthquake.pdf.

ACI Committee 318,"Building Code Requirements for Structural Concrete (ACI 318-14) and Commentary, (ACI 318R-14)", American Concrete Institute, Farmington Hills, Michigan, (2014).

ASCE/SEI 41-13 (2014), "Seismic evaluation and retrofit of existing buildings", American Society of Civil Engineers, Reston, Virginia.

Elwood, K. J., Matamoros, A. B., Wallace, J. W., Lehman, D. E., Heintz, J. A., Mitchell, A. D., Moore, M. A., Valley, M. T., Lowes, L. N., Comartin, C. D., and Moehle, J. P. (2007), "Update to ASCE/SEI 41 concrete provisions", Earthquake Spectra, 23 (3): 493 – 523.

ETABS, "Technical Note: Material Stress-Strain Curves", Computers and Structures, Inc., june 2008.

ETABS, "Structural and Earthquake Engineering Software", Release 2016, Computers and Structures, Inc.

ETABS, "CSi Analysis Reference Manual", Computers and Structures, Inc., Berkeley, California, USA, copyright 2016.

FEMA 356 (2000), "Prestandard and Commentary for Seismic Rehabilitation of Buildings", Prepared by the American Society of Civil Engineers for the Federal Emergency Management Agency, Washington, D.C.

PEER/ATC 72-1, "Modeling and acceptance criteria for seismic design and analysis of tall buildings", Pacific Earthquake Engineering Research Center (PEER)/Applied Technology Council (ATC) (2010).

FEMA P-750 (2009c), "NEHRP Recommended Seismic Provisions for New Buildings and Other Structures", Part 2, Commentary to ASCE/SEI 7-05.

FEMA 450 (2004b), "NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures", FEMA 450-2/2003 Edition, Part 2: Commentary, Federal Emergency Management Agency, Washington, D.C.

FEMA 450 (2004a), "NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures", FEMA 450-1/2003 Edition, Part 1: Provisions, Federal Emergency Management Agency, Washington, D.C.

FEMA 440 (2005), "Improvement of Nonlinear Static Seismic Analysis Procedures", prepared by the Applied Technology Council (ATC-55 Project) for the Federal Emergency Management Agency, Washington, D.C.

ATC-40, "Seismic evaluation and retrofit of concrete buildings", Prepared by the Applied Technology Council, Rep. No. ATC-40, Redwood City, CA, for the California Seismic Safety Commission (Rep. No. SSC 96-01), (1996).

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DOI: 10.28991/cej-2019-03091261


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