Seismic Risk Assessment of Asymmetric Frame Buildings using Fragility Curves

International Journal of Civil Engineering

© 2020 by SSRG - IJCE Journal

Volume 7 Issue 5

Year of Publication : 2020

Authors : Upasana R. Rana, Snehal V. Mevada, Vishal B. Patel

10.14445/23488352/IJCE-V7I5P101

How to Cite?

Upasana R. Rana, Snehal V. Mevada, Vishal B. Patel, "Seismic Risk Assessment of Asymmetric Frame Buildings using Fragility Curves," SSRG International Journal of Civil Engineering, vol. 7,  no. 5, pp. 1-9, 2020. Crossref, https://doi.org/10.14445/23488352/IJCE-V7I5P101

Abstract:

Risk assessment is a useful tool for determining ultimate behavior of structures subjected to highly unpredictable and uncertain dynamic forces produced from earthquakes. Fragility curves are the best representation of risk assessment. In the present study, risk assessment and fragility analysis of asymmetric structures subjected to seismic loading are evaluated. Further, the effects of various eccentricities on seismic risk assessment are also studied. The fragility curves are developed for different cases of eccentricities and various structural configurations of 5 storied RCC bare frame building. The considered buildings are subjected to ground motions of past recorded earthquakes. Incremental Dynamic Analyses carried out to evaluate the responses of the considered buildings subjected to earthquake excitations. Considering various performance levels as per ATC-40, Monte Carlo is the method used to develop fragility curves. It is observed that for immediate occupancy failure criteria, the probability of failure is increased constantly with increasing the percentage of structural eccentricity. Further, very less variation is observed in the probability of failure under life safety and collapse prevention failure stages.

Keywords:

Risk Assessment, Fragility Curves, Seismic load, Incremental Dynamic Analysis

References:

[1] Datta T K (2010), ‘Seismic Analysis of Structures’, John Wiley & Sons (Asia) Pte Ltd.
[2] Ditlevsen O. and Madsen H.O. (2005), ‘Structural Reliability Methods’ John Wiley & Sons Ltd, Chichester.
[3] Sheth & Desai (2018) ‘Performance Evaluation of RC Moment Resisting Frames by Development of Fragility Curves’, 16th Symposium on Earthquake Engineering December 20-22, 2018 IIT Roorkee, India Paper No. 11
[4] Celik, O. C., & Ellingwood, B. R. (2009) ‘Seismic risk assessment of gravity load designed reinforced concrete frames subjected to mid-America ground motions’, Journal of Structural Engineering, Vol. 135, No. 4, pp. 414-424.
[5] Mojiri, S., El-Dakhakhni, W. W., & Tait, M. J. (2015) ‘Seismic fragility evaluation of lightly reinforced concrete-block shear walls for probabilistic risk assessment’, Journal of Structural Engineering, Vol. 141, No. 4, pp 04014116-1 to 04014116-13.
[6] Arabzadeh, H., & Galal, K. (2017) ‘Seismic Collapse Risk Assessment and FRP Retrofitting of RC Coupled C-Shaped Core Walls Using the FEMA P695 Methodology’, Journal of Structural Engineering, Vol. 143, No. 9, pp 04017096-1 to 04017096-20.
[7] Faghihmaleki, H., (2017) ‘An evaluation of multi-hazard risk subjected to blast and earthquake loads in RC moment frame with shear wall’, Journal of Engineering Science and Technology, Vol. 12, pp 1-12.
[8] Huang, Y., Hu, H., & Xiong, M. (2018) ‘Performance-based seismic fragility analysis of retaining walls based on the probability density evolution method’, Structure and Infrastructure Engineering, Vol. 15, pp 1-10.