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Computers and Concrete
  Volume 16, Number 1, July 2015, pages 99-123

Fragility assessment of RC-MRFs under concurrent vertical-horizontal seismic action effects
Ehsan Noroozinejad Farsangi, Abbas Ali Tasnimi and Babak Mansouri

    In this study, structural vulnerability of reinforced concrete moment resisting frames(RC-MRFs) by considering the Iran–specific characteristics is investigated to manage the earthquake risk in terms of multicomponent seismic excitations. Low and medium rise RC-MRFs, which constitute approximately 80-90% of the total buildings stock in Iran, are focused in this fragility–based assessment. The seismic design of 3-12 story RC-MRFs are carried out according to the Iranian Code of Practice for Seismic Resistant Design of Buildings (Standard No. 2800), and the analytical models are formed accordingly in open source nonlinear platforms. Frame structures are categorized in three subclasses according to the specific characteristics of construction practice and the observed seismic performance after major earthquakes in Iran. Both far and near fields\' ground motions have been considered in the fragility estimation. An optimal intensity measure (IM) called Sa, avg and beta probability distribution were used to obtain reliable fragility–based database for earthquake damage and loss estimation of RC buildings stock in urban areas of Iran. Nonlinear incremental dynamic analyses by means of lumped-parameter based structural models have been simulated and performed to extract the fragility curves. Approximate confidence bounds are developed to represent the epistemic uncertainties inherent in the fragility estimations. Consequently, it\'s shown that including vertical ground motion in the analysis is highly recommended for reliable seismic assessment of RC buildings.
Key Words
    RC-MRFs; fragility curve; vertical seismic excitations; NL platforms; beta distribution
Ehsan Noroozinejad Farsangi : SERC, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran
Abbas Ali Tasnimi : Department of Civil and Environmental Engineering, Tarbiat Modares University (TMU), Tehran, Iran
Babak Mansouri : ERMRC, International Institute of Earthquake Engineering and Seismology (IIEES), Tehran, Iran

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