RESEARCH ARTICLE
Review of the Soft First Story Irregularity Condition of Buildings for Seismic Design
Arturo Tena-Colunga*
Article Information
Identifiers and Pagination:
Year: 2010Volume: 4
First Page: 1
Last Page: 15
Publisher ID: TOCIEJ-4-1
DOI: 10.2174/18741495010040100001
Article History:
Received Date: 16/5/2009Revision Received Date: 14/10/2009
Acceptance Date: 26/10/2009
Electronic publication date: 13/1/2010
Collection year: 2010
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.
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.