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In earthquake resistant design, the soft story and the weak story irregularities are reciprocal to a significant difference between the stiffness and the resistance of one of the floors of a building and the rest of them.

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Friday, 23 November 2012SOFT STORY AND WEAK STORY IN EARTHQUAKE RESISTANT DESIGN: A MULTIDISCIPLINARY APPROACH L. Teresa Guevara-PerezFacultad de Arquitectura y Urbanismo, Universidad Central de Venezuela, Caracas.Presented in 15WCEE, Lisbon 2012SUMMARY:Soft story and weak story are irregular building configurations that are a significant source of serious earthquake damage. These configurations that are essentially originated due to architectural decisions have long been recognized by earthquake engineering as seismically vulnerable. In terms of seismic regulations their irregular condition requires the application of special considerations in their structural design and analysis. The majority of urban zoning regulations in contemporary cities, although, at present encourages and in some cases enforces the use of them not requiring special considerations. This paper analyses the architectural reasons why these configurations are present in contemporary cities and explains in conceptual terms their detrimental effects on building seismic response. These effects are presented from a multidisciplinary perspective -engineering, architecture and urban planning- because their treatment can only be achieved by an integrated approach that recognizes the interaction between these disciplines. Examples of damage due to these effects are analyzed.Keywords: soft story and weak story, irregular building configurations, multidisciplinary perspect

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