RESEARCH ARTICLE


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



Arturo Tena-Colunga*
Departamento de Materiales, Edificio 4P, Ultimo Piso, Universidad Autonoma Metropolitana Azcapotzalco, Av. San Pablo # 180, Col. Reynosa Tamaulipas, 02200 Mexico, DF, Mexico.


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Creative Commons License
© 2010 Arturo Tena-Colunga.

open-access license: This is an open access article distributed under the terms of the Creative Commons Attribution 4.0 International Public License (CC-BY 4.0), a copy of which is available at: https://creativecommons.org/licenses/by/4.0/legalcode. This license permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

* Address correspondence to this author at the Departamento de Materiales, Edificio 4P, Ultimo Piso, Universidad Autonoma Metropolitana Azcapotzalco, Av. San Pablo # 180, Col. Reynosa Tamaulipas, 02200 Mexico, DF, Mexico; Tel: + (52-55)5318-9460; Fax: + (52-55)5318-9085; E-mail: atc@correo.azc.uam.mx


Abstract

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.

Keywords: Soft first story, Structural irregularity, Design of irregular buildings, Lateral shear stiffness.