Development of the Fragility Curves for Conventional Reinforced Concrete Moment Resistant Frame Structures in Qods Town, Qom City, Iran

Document Type : Research Papers


1 Associate Professor, Faculty of Civil Engineering, University of Qom, Qom, Iran.

2 M.Sc. Student, Faculty of Civil Engineering, University of Qom, Qom, Iran.


In the Second World Conference on Disaster Risk Reduction (WCDRR) the concept of resilience has been presented as an Effective Strategy to improve post-earthquake conditions. One of the principles of resilience is “quick response”, which requires having relevant information to determine the level of vulnerability of the city. For this purpose, many studies have been done in recent years to investigate the seismic behavior of a variety of infrastructures in a city. The fragility curve is one of the most popular tools among researchers to investigate the probabilistic seismic behavior of structures. It expresses the degree of structural vulnerability by indicating the exceedance probability of damage versus the given level of ground shaking. In this study, 24 fragility curves are developed for four typical intermediate Reinforced Concrete Moment Resistant Frame structures in Qods town (located in Qom, Iran) with two number of stories (4 and 8) and two number of bays (1 and 2). They are derived through nonlinear incremental dynamic analysis in one and two horizontal directions under two sets of near-field and far-field ground motion records. The results indicate that the seismic response of structures is the same for uni-directional and bi-directional analyses. Also, it seems that the response of the structures with periods greater than 1 sec is in correlation with the mass-to-stiffness ratio. Change in the width and number of bays of the structure does not affect the probability of failure, as far as the width to the number of bays ratio remains constant. Furthermore, the probability of failure is higher when the structure is subjected to near-field earthquake ground motion records.


Abdollahzadeh, G.R., Sazjini, M. and Asghari, A. (2015). “Seismic fragility Assessment of Special Truss Moment Frames (STMF) using the Capacity Spectrum Method”, Civil Engineering Infrastructures Journal, 48(1), 1-8.
ACI 318-14. (2014). Building code requirements for structural concrete, American Concrete Institute, Farmington Hills, MI.
A‌h‌m‌a‌d‌i P‌a‌z‌o‌k‌i, M., S‌h‌a‌k‌i‌b, H. and M‌o‌h‌a‌m‌m‌a‌d‌i, P. (2015). “Cost-benefit analysis of construction and reh‌abili‌ta‌tion of steel braced frames with infill panels using seismic damage fragility curves”, Journal of Sharif Civil Engineering, 31.2(1.2), 51-59.
ASCE 41-13. (2014), Seismic evaluation and retrofit of existing buildings, American Society of Civil Engineers, Reston, VA.
ATC-13. (1985). Earthquake damage evaluation data for California, Federal Emergency Management Agency (FEMA), 492 p.
Cornell, C. and Krawinkler, H. (2000). “Progress and challenges in seismic performance assessment”, PEER Center News, 3, 1-3.
FEMA-356 (2000) “Prestandard and commentary for seismic rehabilitation of buildings”, Federal Emergency Management Agency, 7(2), Washington DC.
FEMA P695. (2009). Recommended methodology for quantification of building system performance and response parameters, Project ATC-63, Prepared by the Applied Technology Council, Redwood City.
Building and Housing Research Center. (2016). Iranian code of practice for seismic resistance design of buildings, Standard No. 2800, 3rd Edition, Building and Housing Research Center, Tehran, Iran, (In Persian).
Kouhestanian, H., Pahlavan, H., Shafaei, J. and Shamekhi Amiri, M. (2019). “Probabilistic seismic assessment of RC buildings considering soft and extreme soft story irregularities subjected to main shock-aftershock sequences”, Amir Kabir Journal of Civil Engineering, 53(2), 457-478.
Mohsenian, V., Rostamkalaee, S., Moghadam, A.S. and Beheshti-Aval, S.B., (2017). “Evaluation ‌ of seismic sensitivity of tunnel form concrete buildings to mass eccentricity in the plan”, Journal of Sharif Civil Engineering, 33.2(3.2), 3-16.
Moehle, J. and Deierlein, G.G. (2004). “A framework methodology for performance-based earthquake engineering”, Proceedings of the 13th  World Conference on Earthquake Engineering, 679, 3812-3814.
Mobinipour, A. and Pourzeynali, S. (2020). “Assessment of near-fault ground motion effects on the fragility curves of tall steel moment resisting frames”, Civil Engineering Infrastructures Journal, 53(1), 71-88.
Newmark, N.M. (1959). “A method of computation for structural dynamics”, Journal of Engineering Mechanics Division, ASCE, July 67-94.
Pahlavan, H., Naseri, A. and Einolahi, A. (2019). “Probabilistic seismic vulnerability assessment of RC frame structures retrofitted with steel jacketing”, Amir Kabir Journal of Civil Engineering, 51(3), 585-598.
Rojahn, C. and Sharpe, R.L. (1985). “Earthquake damage evaluation data for California”, Applied Technology Council. 
Taghizade, F., Eskandari, M., Afsari, N. and Gheitanchi, M.R. (2009). “Studying seismotectonics and seismicity of Qom province”, Earth, 3(3), 59-70.
Whitman, R.V., Lagorio, H.J. and Schneider, P.J. (1996) “Fema- nibs earthquake loss estimation methodology”, in Natural Disaster Reduction. pp. 113-114, ASCE.
Volume 55, Issue 1
June 2022
Pages 31-41
  • Receive Date: 13 July 2020
  • Revise Date: 24 January 2021
  • Accept Date: 30 January 2021
  • First Publish Date: 01 June 2022