Sistema Regional de Información
en línea para Revistas Científicas de América Latina,
el Caribe, España y Portugal

This research presents the behavior of a real scale experimental column-beam joint formed by three reinforced concrete elements, 1 column and 2 beams, attached to a structural steel column in the upper level is studied. The specimen in question was subjected to the action of cyclic loads in a single direction, in a pseudostatic test for 5000 s, in order to observe which element of the specimen failed and which the failure mode was. The investigation was based on the use of digital images taken throughout the test, during the loading and unloading cycles, each photo being analyzed with the CORRELI-Q4 subroutine, in order to visualize the places where cracking occurs in the concrete. The use of the application allowed to reveal how cracking in the reinforced concrete occurred during the test, and that the column of reinforced concrete was the one that was most affected by cracking, with cracks just below the concrete beams.

The seismic design is based on the results of the structures elastic analysis, even though now days the nonlinear analysis is increasingly accessible. To perform the seismic analysis of structures that are modeled with elastic behavior, but known to venture into the plastic behavior, the standards establish the reduction of the elastic design spectra by the use of reduction factors, formulated essentially on the basis of the engineering judgment. This paper proposes a strategy to obtain response reduction factors, based on the results of non-linear analysis of soil response and structural systems with a degree of freedom, along with the non-linear response of multiple grade of freedom framed structural systems by armed concrete, for the specific spectra of Venezuela. The results of response reductions factors were greater than the current values of response reduction prescribed by the Venezuelan seismic code, which can favorably lead to a displacement-based design instead strength-based design.  

This paper discusses the flexural strength of reinforced concrete beams of square cross section, exposed to fire during different times. After being exposed to fire the beams were left to cool at room temperature for 24 hours, the changes produced by this phenomenon were evaluated by observation. The temperatures reached oscillated between 750 °C and 1050 °C. Through the ASTM C78 test it was determined that the flexural strength decreases drastically as the temperature and exposure time of the beams increases, showing different signs of degradation ranging from a slight calcination and change of coloration to the loss of section of the element. This research showed that the flexural strength decreased by more than 90% with respect to the beams not exposed to fire, this result was obtained when a temperature of 1050 °C was reached at 180 minutes of exposure to fire

This study aimed to address quality management in the university classroom, specifically in the Department of Basic Sciences of the Dean of Civil Engineering of the Universidad Centroccidental Lisandro Alvarado. It was conceived under the modality of qualitative research of ethnographic type with an interpretive character. The research process involved three phases: obtaining information, in which key informants were selected from a group of four (4) teachers and three (3) students in an intentional sampling, interview techniques were applied and participant observation to record and categorize the informants' opinions. In the second phase, the analysis and interpretation of the information was done using the GLATER model, which allowed orientating it from four stages: the first stage assignment of codes and dimensions, second stage of description, third of categorization and fourth stage of interpretation. In the third and final phase the construction of a theoretical approach of the quality management based on the managerial method PDCA, proposed by the researcher, was carried out starting from the analysis of the categories and their properties. As a result of this process, the thematic categories emerged: Integral Training, Availability and Use of School Media, Dynamics of Organizational Learning and Institutional Leadership.

In the world of scientific publications, it is essential to keep in mind the so-called “copyright”. It is a somewhat common practice to find in various works sent by the Editorial Committee of a scientific journal to the evaluators for their respective review, copies of fragments or complete texts reflected in other works already published; this belies the academic reliability of the author, whether he did it consciously, or simply out of simple ignorance. Therefore, it is required to make public knowledge what is the appropriate practice when wanting to reflect in the context of a manuscript the original ideas of another author.

Neste artigo presentamos os principais resultado dos traballos arqueolóxicos realizados nunha serie de asentamentos fortificados situados no sueste da Galiza. Estes, coñecidos na historiografía, levaban tempo, porén, requirindo unha revisión arqueolóxica en profundidade debido á fragmentación dos dados sobre eles. Esta incluíu unha caracterización morfolóxica do sitio e unha análise da materialidade depositada nos museos de referencia. Mentres que a realidade da aparición dunha paisaxe fortificada na época pos-romana en lugares tan próximos como o Val do Douro, por exemplo, é algo asumido, para a historiografía galega esta realidade é algo descoñecido ou excluído. Ao longo deste texto pretendemos profundar no coñecemento existente arredor desta paisaxe fortificada para a Gallaecia, reformulando algunhas das principais hipóteses historiográficas para este período.

El noroeste de la Península Ibérica es una región particularmente interesante para el estudio del arte rupestre europeo porque aquí se encuentra el área de transición entre dos importantes tradiciones: el Arte Atlántico, que está típicamente grabado sobre afloramientos al aire libre y el Arte Esquemático pintado, principalmente en abrigos rocosos y cavidades poco profundas. El primero se extiende a lo largo de la fachada atlántica de Galicia occidental y noroeste de Portugal, mientras que este último se extiende desde el sur y centro de Iberia hasta el noreste de Portugal y las provincias españolas de León y Asturias, a lo largo de la cuenca de los ríos Duero, Sil, Navia y Nalón. Hasta el año 2017, resultaba sorprendente la ausencia de pinturas rupestres en el área oriental de Galicia, a pesar de constituir una extensión de esas regiones naturales.El objetivo de este trabajo es proporcionar el primer enfoque integrado de los sitios con pinturas de Arte Esquemático en el noroeste, estableciendo los antecedentes, en cuanto al análisis espacial, sobre el concepto de regiones biogeográficas con el fin de superar los sesgos de estudios anteriores, tradicionalmente confinados a límites administrativos. Ello ofrece una visión general de las diferentes tradiciones del arte prehistórico y sus contextos, evalúa los hallazgos recientes en su contexto más amplio, y investiga los paisajes de las pinturas rupestres, con el fin de establecer estrategias potenciales para futuros estudios de campo en la Galicia oriental.

O fenómeno tumular, é un dos temas máis tratados nos estudos da Prehistoria do Noroeste Ibérico, e concretamente da Península do Barbanza. A devandita cuestión está condicionada aínda a día de hoxe por toda unha serie de interrogantes que se van mantendo no tempo, a pesar desa produción historiográfica. Para contribuír modestamente a resolver algunha delas, levamos a cabo unha análise da distribución espacial dos túmulos da área de estudo, comparando as súas características, mediante o uso conxunto de Sistemas de Información Xeográfica (fundamentalmente GRASS GIS) e de ferramentas estatísticas (R). Os resultados amosan que a distribución dos túmulos na Península do Barbanza está moi condicionada polas fortes encostas da Serra, e que estes están ubicados en espazos abertos, pero en puntos en puntos non especialmente prominentes.

Neste traballo preténdese estudar algunhas das evidencias estruturais e gran parte da cultura material documentadas durante a escavación do asentamento prehistórico de Monte dos Remedios (Moaña, Pontevedra) por medio do uso de Sistemas de Información Xeográfica (GRASS-GIS, Quantum GIS, etc.) e de programas de análise estatístico de código aberto (R). De esta forma, abórdanse as problemáticas do asentamento e prantéxanse as relacións entre os propios materiais arqueolóxicos recuperados (cerámica, artefactos líticos…) e as principais estruturas identificadas (buratos de poste, pavimentos…) co fin de intentar achegar datos sobre a natureza e finalidade de ditos restos estruturais.