<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>0185-092X</journal-id>
<journal-title><![CDATA[Ingeniería sísmica]]></journal-title>
<abbrev-journal-title><![CDATA[Ing. sísm]]></abbrev-journal-title>
<issn>0185-092X</issn>
<publisher>
<publisher-name><![CDATA[Sociedad Mexicana de Ingeniería Sísmica A.C.]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-092X2016000200053</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Estudio paramétrico de modelos representativos de estructuras propensas a desarrollar pisos suaves o débiles ante excitaciones sísmicas de suelo blando]]></article-title>
<article-title xml:lang="en"><![CDATA[Parametric study of representative models of structures prone to develop soft or weak stories subjected to ground motions typical of soft soils]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Hernández García]]></surname>
<given-names><![CDATA[Daniel Alberto]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Tena Colunga]]></surname>
<given-names><![CDATA[Arturo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Autónoma Metropolitana  ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>Mexico</country>
</aff>
<aff id="Af2">
<institution><![CDATA[,Universidad Autónoma Metropolitana  ]]></institution>
<addr-line><![CDATA[México ]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2016</year>
</pub-date>
<numero>95</numero>
<fpage>53</fpage>
<lpage>80</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-092X2016000200053&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-092X2016000200053&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-092X2016000200053&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen: Se presenta un estudio paramétrico en modelos simplificados de dos grados de libertad (2gdl) que representan estructuras con disposición a desarrollar pisos suaves o débiles, donde se han variado las relaciones de rigideces y resistencia lateral entre ambos niveles de los modelos. Se condujeron análisis dinámicos no lineales paso a paso, utilizando 10 registros de aceleración sintéticos correspondientes a la zona III-a del lago de la ciudad de México y asociados al espectro de diseño del Apéndice A de las Normas Técnicas Complementarias para Diseño por Sismo del Reglamento para las Construcciones del Distrito Federal vigente. Con base en el estudio de los resultados obtenidos, en particular curvas de ductilidades y distorsiones máximas resultantes de estos análisis, se puede concluir que el mecanismo de piso suave o débil se previene o amplifica con una combinación adecuada de las propiedades mecánicas (rigidez y resistencia) de la estructura muy cercana a lo que actualmente proponen los reglamentos de diseño sísmico de México.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract: A parametric study where two-degree of freedom (2DOF) simplified models are used to represent structures likely to develop soft or weak stories is presented. Different stiffness and strength balances were considered to define a realistic range of structures with the potential to develop soft story mechanisms according to recommendations of current seismic building codes. Therefore, 338 models were studied for all the considered stiffness and strength combinations which represent typical buildings structures with soft or weak stories currently built in the lakebed zone of Mexico City. Step by step nonlinear dynamic analyses were conducted using 10 artificial acceleration records generated to be compatible with the design spectrum for zone III-a of 2004 Mexico´s Federal District Code, corresponding to soft soil conditions in Mexico City. Peak ductility demands and story drifts were obtained, which were compared with some reference value currently proposed in building codes. The results obtained from this parametric study mostly confirm that a soft story mechanism is triggered or prevented with a right combination of strength and stiffness balances for the structural system, which are close to what it is currently proposed in Mexican seismic building codes.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[piso suave]]></kwd>
<kwd lng="es"><![CDATA[piso débil]]></kwd>
<kwd lng="es"><![CDATA[balances de rigidez y resistencia]]></kwd>
<kwd lng="es"><![CDATA[demandas de ductilidad]]></kwd>
<kwd lng="es"><![CDATA[distorsiones de entrepiso]]></kwd>
<kwd lng="es"><![CDATA[análisis dinámicos no lineales]]></kwd>
<kwd lng="es"><![CDATA[registros de aceleración de terreno blando]]></kwd>
<kwd lng="en"><![CDATA[soft story]]></kwd>
<kwd lng="en"><![CDATA[weak story]]></kwd>
<kwd lng="en"><![CDATA[stiffness and strength balances]]></kwd>
<kwd lng="en"><![CDATA[ductility demands]]></kwd>
<kwd lng="en"><![CDATA[story drifts]]></kwd>
<kwd lng="en"><![CDATA[nonlinear dynamic analyses]]></kwd>
<kwd lng="en"><![CDATA[soft soil acceleration records]]></kwd>
</kwd-group>
</article-meta>
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