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Review of the Soft First Story Irregularity Condition of Buildings for Seismic Design

Author: Arturo Tena-Colunga | Size: 1.6 MB | Format: PDF | Quality: Unspecified | Publisher: The Open Civil Engineering Journal, 2010, 4, 1-15 | Year: 2010 | pages: 15

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The present study evaluates how the soft first story irregularity condition should be defined: (a) as a significant
reduction of the lateral shear stiffness of all resisting frames within a given story, as established in the seismic provisions
of Mexican building codes or, (b) as a substantial reduction of the lateral shear stiffness of one or more resisting frames
within a given story, as proposed by the author. Both definitions are evaluated through nonlinear dynamic analyses of
buildings systems with a suspected soft first story condition in order to discern which option is closer to define the soft fist
story condition.

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