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Fragility Assessment for Torsionally Asymmetric Buildings in Plan

Authors: A. Ghasemi, S. Feli, S. Tavousi Tafreshi


The present paper aims at evaluating the response of three-dimensional buildings with in-plan stiffness irregularities that have been subjected to two-way excitation ground motion records simultaneously. This study is broadly-based fragility assessment with greater emphasis on structural response at in-plan flexible and stiff sides. To this end, three type of three-dimensional 5-story steel building structures with stiffness eccentricities, were subjected to extensive nonlinear incremental dynamic analyses (IDA) utilizing Ibarra-Krawinkler deterioration models. Fragility assessment was implemented for different configurations of braces to investigate the losses in buildings with center of resisting (CR) eccentricities.

Keywords: fragility assessment, flexible and stiff side, center of resisting, Ibarra Krawinkler

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[1] National Institute of Building Sciences. Development of a standardized earthquake loss estimation methodology. Washington (DC): FEMA; (1995).
[2] Jalayer F. “Direct probabilistic seismic analysis: implementing nonlinear dynamic assessments” Ph.D. Dissertation, Department of Civil and Environmental Engineering, Stanford University, Stanford, California, (2003).
[3] Ibarra LF, Medina RA, Krawinkler H. “Hysteretic models that incorporate strength and stiffness deterioration.” International Journal for Earthquake Engineering and Structural Dynamics, Vol. 34, No.12, pp. 1489-1511 (2005).
[4] Zareian F, Medina RA. “A practical method for proper modeling of structural damping in inelastic plane structural systems.” Journal of Computers and Structures, 88, 45-53 (2010).
[5] Vamvatsikos D, Cornell CA. Tracing and post-processing of IDA curves: Theory and software implementation, Report No. RMS–44, RMS Program, Stanford University, Stanford (2001).
[6] Mario de Stefano, Barbara Pintucchi, “A review of research on seismic behavior of irregular building structures” (2008).
[7] Paulay T. “Some Design Principles relevant to Torsional Phenomena in Ductile Buildings”. Journal of Earthquake Engineering, 5:3, 273-308 (2001).
[8] Wong CM, Tso WK. “Inelastic seismic response of torsionally unbalanced systems designed using elastic dynamic analysis”. Earthquake Engineering and Structural Dynamics, 23, 7, pp. 777-79 (1994).
[9] Dimitrios Vamvatsikos, Allin Cornell, Incremental Dynamic Analysis, John Wiley & Sons (2002).
[10] Haj seiyed Taghia, Abdoreza S. Moghadam, Ashtiany, Seismic performance of torsionally stiff and flexible multi-story concentrically steel braced buildings, (2012).
[11] Salar manie, Abdoreza S. Moghadam, Ashtiany, Probabilistic Response Evaluation of Plan-Irregular Buildings Subjected to Bi-directional Seismic Loading, (2014).
[12] Yasser picazo, Orlando Diaz Lopez, Luis Esteva, Seismic reliability analysis of buildings with torsional eccentricities, (2014).
[13] Silvia Mazzoni, Frank McKenna, Michael H. Scott, Gregory L. Fenves et al. 2007, Open System for Earthquake Simulation(OPENSEES) Language Manual
[14] Barron-Corvera, 2000, Spectral Evaluation of Seismic Fragility in Structures
[15] Keith Porter, Ron Hamburger, Practical Development and Application of Fragility Functions, (2007).
[16] Seong hoon, amr Elnashai, Fragility relationships for torsionally-imbalanced buildings using three-dimensional damage characterization, (2006).
[17] Multi-Hazard Loss Estimation Methodology Earthquake Model, HAZUS MR4, Technical Manual