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Probabilistic Response Evaluation of Plan-Irregular Buildings Subjected to Bi-directional Seismic Loading Original Article, D34 Manie S, Moghadam AS, Ghafory-Ashtiany M. J. Civil Eng. Urban. 4(3): 223-232. 2014 ABSTRACT: The present paper aim at evaluating the response of three-dimensional buildings with in-plan unidirectional mass irregularities subjected to bi-directional seismic loading. The study is carried out in a probabilistic frame-work considering the response of the structural models at their near-collapse nonlinear state of response. To this end, three-dimensional 3 and 6-story reinforced concrete building structures with unidirectional mass eccentricities equal to 0% (symmetrical), 10%, 20% and 30%, were subjected to extensive nonlinear incremental dynamic analyses (IDA) utilizing degrading hysteretic models under a set of far-field two-component ground motions records. The collapse-level intensities of each model under all records were, then, assessed using standard uni-variate as well as bi-variate statistical and probabilistic analysis procedures. Results demonstrated that remarkable differences exist between behavior of regular and irregular buildings in terms of median collapse-level spectral intensities, the corresponding coefficients of variation, and the properties of the associated probability density and cumulative density functions (PDFs and CDFs). The paper, also, introduces the “fragility surface” concept as an alternative to conventional fragility curves for collapse behavior assessment of three-dimensional structures. Keywords: Torsional Buildings, Probabilistic, Collapse, Plan Irregularity, Low-Rise Buildings. منبع: [Hidden Content] دانلود: [Hidden Content].,%204%20(3)%20223-232,%202014.pdf J. Civil Eng. Urban., 4 (3) 223-232, 2014.pdf