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Submission received: 8 February 2024 / Revised: 28 February 2024 / Accepted: 16 March 2024 / Published: 21 March 2024 (This article belongs to the Special Issue Advanced Research in Myopia and Other Visual Disorders), Background: In recent decades, myopia has turned into a public health issue across the world. Between 1993 and 2016, the percentage of myopes increased from 10.4% to 34.2%. This study aims to analyze the myopia prevalence in Spanish children from five to seven years old over the last five years and to predict the rate of myopia in Spain by 2030. Methods: The sample consisted of children aged between 5 and 7, who underwent an optometric examination consisting of the measurement of visual acuity (VA) and determination of objective and subjective refraction. The cut-off points to define refractive error are established by the spherical equivalent (SE) value: hyperopia for an SE over or equal to +0.50 D; myopia for an SE under or equal to −0.50 D; and emmetropia when the SE is between −0.50 D and +0.50 D. Results: The myopia rate in Spanish children aged between five and seven was 19%. Myopia prevalence progressively increased as children grew up (p ≤ 0.001). It is estimated that, in the year 2030, the rate of myopia will be 30.2% [CI: 25.3–35.0], of which 81.9% [CI: 78.3–85.3] will have low myopia, 10.0% [CI: 7.2–12.8] moderate myopia, and 7.3% [CI: 4.9–9.7] high myopia. Conclusions: Nineteen percent of Spanish children between five and seven are myopes. In 2030, is expected that 30.2% of Spanish children between 5 and 7 years of age will be myopes. These estimations will support eye care professionals in recommending that children spend more time outdoors to prevent the onset of myopia and the use of methods to control myopia to avoid reaching these figures of high myopia., Depto. de Optometría y Visión, Fac. de Óptica y Optometría, TRUE, pub

El presente Trabajo Fin de Grado consiste en un estudio de la influencia de las condiciones ambientales para la orientación de una nave industrial, con especial atención al viento y a la luz solar, que permitirá la generación de energía eléctrica a través de placas solares instaladas sobre su cubierta. Para ello, se diseñará un caso de referencia en el programa de diseño estructural Robot y se calculará el correcto dimensionamiento de las barras de la estructura, así como la producción fotovoltaica de los módulos solares gracias a la herramienta digital PVGIS. Por último, se estudiarán varias posibilidades en la orientación e inclinación de la cubierta, con el fin de analizar los resultados., This Final Degree Project consists of a study of the influence of environmental conditions on the orientation of an industrial unit, paying special attention to wind and sunlight, which would allow the electricity generation through solar panels installed on its roof. For this purpose, a reference case will be designed with the Robot structural software and the accurate sizing of the structural bars will be calculated, as well as the photovoltaic production of the solar modules thanks to the PVGIS digital tool. Finally, various possibilities in the orientation and the roof’s angle will be considered, in order to analyze the results., Departamento de Construcciones Arquitectónicas, Ingeniería del Terreno y Mecánica de los Medios Continuos y Teoría de Estructuras, Grado en Ingeniería Mecánica

Background: There are environmental factors that may contribute to the onset of myopia. This study aims to evaluate the children’s lifestyle changes before and after the COVID-19 lockdown and how they can influence their vision. Methods: The same questionnaire was administered to children aged between 5 and 7 in Spain every year in September before (2017–2019) and after the COVID-19 lockdown (2020–2021). All the children also passed a vision exam consisting of the measurement of visual acuity (VA) and determination of objective and subjective refraction. Children were classified as myopes, pre-myopes, or hyperopes. The cut-off points to define the refractive error were established according to the value of the spherical equivalent (SE): hyperopia (SE > +0,75D), myopia (SE ≤ −0,5D), or pre-myopia (−0.5D < SE ≥ +0.75D). Data analysis is performed with the SPSS 27.0 software (SPSS Inc., Chicago, Illinois). Results: In the pre-COVID period, the pre-myopes were the ones who spent the longest time outdoors, and after the COVID lockdown, there were no differences between groups. There neither were any differences in the time spent doing near-work activities between the groups in both periods (p > 0.05). Regarding the spherical equivalent, in the pre-COVID period, the mean value was 0.75 ± 2.09D and after the COVID lockdown, it was 0.47 ± 1.88D (p < 0.001). Conclusion: Pre-myopes spent more time outdoors than myopes in the pre-COVID period, while myopes spent more time using digital devices. All these differences do not exist after the COVID lockdown, with a general increase in the time spent outdoors and a decrease in the use of digital devices. Further studies are needed to know if these lifestyle changes remain and how they influence the onset of myopia. Copyright © 2023 Alvarez-Peregrina, Ruiz-Pomeda, Martinez-Perez, Prieto-Garrido, Villa-Collar, González-Pérez, González-Abad and Sánchez-Tena., Depto. de Óptica, Fac. de Óptica y Optometría, TRUE, pub

Received: 04 July 2023; Accepted: 18 January 2024; Published: 08 February 2024, Background: Presbyopia is an age-related condition that causes a decreased ability to focus on nearby objects. Multifocal contact lenses are commonly used to address this issue. However, there seems to be a notable dissatisfaction among multifocal contact lens wearers. The absence of a reliable instrument to measure the patient's perspective, despite the widespread use of this method, highlights the need for further research in this area. Objective: The objective of this study is to develop an item-bank integrating all domains necessary to assess the patient's perspective on multifocal contact lens performance, offering a comprehensive measure. The item-bank will ensure a high level of content validity, be self-administered, and will initially be available in Spanish. The aim of this tool is to serve as a valuable resource for research and optometric clinics, facilitating the follow-up of patients with presbyopia who wear multifocal contact lenses or those who are newly starting to use them. Methodology: The MCL-PRO item bank, followed a systematic and step-wise inductive approach to gather information, following the recommendations outlined in the COSMIN guidelines and similar studies. The process involved the following steps: (1) Literature review and relevant existing items identification (2) Social media review, (3) Semi-structured focus groups, (4) performing qualitative analysis, (5) refining and revising the items, and (6) generating the content of the item bank. Results: A total of 575 items were included in the item-bank hosted under 8 different domains that were found to be important for presbyopic population: visual symptoms (213), activity limitation (111), ocular symptoms (135), convenience (36), emotional well-being (33), general symptoms (16), cognitive issues (21) and economic issues (10). Conclusion: The item-bank created has followed standardised methodology for its development and encloses all the aspects for MCL performance evaluation from patien, Depto. de Optometría y Visión, Fac. de Óptica y Optometría, TRUE, pub

[SPA] Este estudio tuvo como objetivos evaluar si diferentes patrones de cultivo asociado entre brócoli (Brassica oleracea var italica) y haba (Vicia faba), bajo manejo orgánico, y una reducción en un 30% de fertilización, pueden mejorar la producción y la fertilidad del suelo comparado con sus respectivos monocultivos. Tras tres ciclos de cultivo desarrollados en el campo de Cartagena, los sistemas asociados incrementaron significativamente el N total, P disponible y K intercambiable (0,13%, 39 mg·kg-1 y 364 mg·kg-1) comparado con el monocultivo de brócoli (0,11%, 11 mg·kg-1 y 277 mg·kg-1). La producción total fue significativamente mayor en los cultivos asociados, con un Land Equivalent Ratio (LER) > 1. Por tanto, la introducción de haba asociada al brócoli es una estrategia viable de agricultura más sostenible, con beneficios ambientales y ahorro económico en fertilizantes y agua. [ENG] The aim of this study was to evaluate whether different broccoli (Brassica oleracea var italica) and fava bean (Vicia faba) intercropping patterns can improve crop yield and soil physicochemical properties under organic management in Murcia (Spain). After three crop cycles, intercropped systems significantly increased total N, available P, and exchangeable K (0.13%, 39 mg·kg-1 y 364 mg·kg-1) compared to the broccoli monoculture (0.11%, 11 mg·kg-1 y 277 mg·kg-1). Total production was significantly higher under the diversified systems, with land equivalent ratio (LER) > 1. Thus, introducing fava bean intercropped with broccoli is a viable strategy for more sustainable agriculture, offering environmental benefits and economic savings on fertilizers and water.

[SPA] Este estudio se centra en los impactos y beneficios de la implementación de sistemas de cultivo asociado, específicamente entre melón-caupí y brócoli-haba, junto con la reducción del laboreo y la adición de residuos de cultivo, todo bajo una gestión orgánica, en comparación con sus respectivos monocultivos. Este estudio tenía el objetivo de potenciar la producción y la calidad de los cultivos, optimizar las propiedades fisicoquímicas del suelo, aumentar la materia orgánica del suelo, la fertilidad, la biodiversidad, minimizar el uso de fertilizantes y atenuar las emisiones de gases de efecto invernadero (GEI). En los dos sistemas implementados de asociación de cultivos, tanto melón-caupí como brócoli-haba, la fertilización se redujo un 30%. Se han propuesto diversos patrones de cultivo asociado, como el cultivo mixto, el cultivo en filas 1:1 y el cultivo en filas 2:1. A lo largo de tres ciclos de cultivo, los sistemas de cultivo asociado mantuvieron los niveles de carbono orgánico en el suelo e incrementaron significativamente el nitrógeno total del suelo, el fósforo disponible y el potasio intercambiable, comparado con sus respectivos monocultivos. Además, mostraron una producción total significativamente superior y un Land Equivalent Ratio (LER) superior a 1, lo que resalta las ventajas de la asociación de cultivos. Las tasas de emisión de CO2 fueron más altas en los sistemas 2:1 y 1:1 de brócoli-haba y en el sistema mixto de melón-caupí, en comparación con los monocultivos de haba y caupí, respectivamente. Las tasas de emisión de N2O del suelo no se vieron afectadas por la asociación de cultivos, registrándose valores muy bajos. Las emisiones de CO2 y N2O del suelo no estuvieron correlacionadas con factores ambientales, propiedades del suelo, o la producción y calidad del cultivo, sugiriendo que la gestión del cultivo, la densidad y crecimiento de las plantas fueron los principales factores que controlaron las emisiones de GEI. A pesar de esto, cuando las e

El actual trabajo aborda la modelización de una nave industrial a través del programa de elementos finitos SAP2000. Posteriormente, se compararán los resultados obtenidos en relación a su dimensionado basándose en un modelo sencillo de simplificación de cargas frente a la normativa vigente, el Código Técnico de Edificación (CTE-DB-SE-AE), que se incluye en otro programa de cálculo estructural, el CYPE; y así, sacar una serie de conclusiones sobre si los resultados calculados gracias a las simplificaciones difieren mucho de los realizados con la normativa actual. Además, basándose en los datos proporcionados por SAP2000, se realizará un análisis teórico/práctico del fenómeno de inestabilidad a pandeo sobre algunos de los elementos estructurales más solicitados para comprobar de forma manual los cálculos que internamente realiza SAP2000., The present work deals with the modeling of an industrial unit through the SAP2000 finite element program, in order to compare the results obtained in relation to its dimensioning, based on a simple load simplification model, with the current regulations, the Technical Building Code (CTE-DB-SE-AE), which is included in another structural calculation program, CYPE, and thus draw a series of conclusions on whether the results calculated thanks to the simplifications differ much from those made with the current regulations. In addition, based on the data provided by SAP2000, a theoretical/practical analysis of the buckling instability phenomenon will be performed on some of the most requested structural elements, in order to manually check the calculations performed internally by SAP2000., Departamento de Construcciones Arquitectónicas, Ingeniería del Terreno y Mecánica de los Medios Continuos y Teoría de Estructuras, Máster en Ingeniería Industrial

Producción Científica, This work focuses on the limit analysis or plastic calculation of slender beam planar frames using a new method. Sufficient static equilibrium equations are proposed by the Principle of Virtual Displacements (PVD) and kinematic compatibility equations are proposed by the Principle of Virtual Forces (PVF). The load level is increased and the structure is solved step by step until the plastic collapse. Equilibrium equations are posed by virtual problems in displacements and compatibility equations are posed by simple virtual problems in equilibrium. The method provides the following results: the collapse load factor, the final collapse mechanism, the bending moments and the accumulated rotations in the plastic hinges in each load step of the structure. This method has advantages over the classical methods; first, with respect to the step-by-step method based on matrix formulation, especially in the case of beams and/or columns with uniform distributed load, and secondly, with respect to the kinematic direct method, since the sequential method provides more information on the quantities involved in the plasticization process of the structure and also goes directly to the calculation of the collapse mechanism without the need to test or combine possible mechanisms.

El enfoque de este estudio consiste en analizar y evaluar el comportamiento de edificios industriales bajo cargas, viento y nieve, considerando los efectos de agujeros y huecos en la estructura. Comprender las respuestas estructurales a diferentes condiciones ambientales y configuraciones de edificios es fundamental para garantizar la seguridad y la eficiencia operativa en áreas como la logística, la fabricación y el almacenamiento. Este proyecto se encarga de evaluar el impacto de dichos huecos en las fachadas de naves industriales y, en función de su ubicación, forma y tamaño, estudiar su integridad estructural y su resistencia a las cargas aplicadas. La herramienta de Robot Structural Analysis aplica una metodología rigurosa que incluye el proceso de modelación de naves industriales, la aplicación de cargas estáticas y dinámicas y la simulación de cargas de viento y nieve. Los resultados obtenidos brindan una visión integral del comportamiento de los edificios industriales y resaltan la importancia de considerar las lagunas en su diseño y construcción. Estos conocimientos contribuirán al desarrollo de mejores prácticas y directrices para optimizar la seguridad, la eficiencia y la adaptabilidad de los edificios industriales a diferentes condiciones climáticas y requisitos funcionales. En resumen, este estudio tiene como objetivo comprender los efectos de los vacíos en los edificios industriales y proporcionar información valiosa para la toma de decisiones y la optimización del diseño en ingeniería industrial., The focus of this study is to analyze and evaluate the behavior of industrial buildings under loads, wind and snow, considering the effects of holes and voids in the structure. Understanding structural responses to different environmental conditions and building configurations is critical to ensure safety and operational efficiency in areas such as logistics, manufacturing and warehousing. This project is tasked with assessing the impact of such voids on the facades of industrial buildings and, based on their location, shape and size, studying their structural integrity and resistance to applied loads. The program Robot Structural Analysis from Autodesk tool applies a rigorous methodology that includes the modeling process of industrial buildings, the application of static and dynamic loads and the simulation of wind and snow loads. The results obtained provide a comprehensive view of the behavior of industrial buildings and highlight the importance of considering gaps in their design and construction. This knowledge will contribute to the development of best practices and guidelines to optimize the safety, efficiency and adaptability of industrial buildings to different climatic conditions and functional requirements. In summary, this study aims to understand the effects of gaps in industrial buildings and provide valuable information for decision making and design optimization in industrial engineering., Departamento de Construcciones Arquitectónicas, Ingeniería del Terreno y Mecánica de los Medios Continuos y Teoría de Estructuras, Grado en Ingeniería en Tecnologías Industriales

Artículo en libre acceso en la web del editor, Purpose.: To develop a questionnaire (in Spanish) to measure computer-related visual and ocular symptoms (CRVOS). Methods.: A pilot questionnaire was created by consulting the literature, clinicians, and video display terminal (VDT) workers. The replies of 636 subjects completing the questionnaire were assessed using the Rasch model and conventional statistics to generate a new scale, designated the Computer-Vision Symptom Scale (CVSS17). Validity and reliability were determined by Rasch fit statistics, principal components analysis (PCA), person separation, differential item functioning (DIF), and item–person targeting. To assess construct validity, the CVSS17 was correlated with a Rasch-based visual discomfort scale (VDS) in 163 VDT workers, this group completed the CVSS17 twice in order to assess test-retest reliability (two-way single-measure intraclass correlation coefficient [ICC] and their 95% confidence intervals, and the coefficient of repeatability [COR]). Results.: The CVSS17 contains 17 items exploring 15 different symptoms. These items showed good reliability and internal consistency (mean square infit and outfit 0.88–1.17, eigenvalue for the first residual PCA component 1.37, person separation 2.85, and no DIF). Pearson's correlation with VDS scores was 0.60 (P < 0.001). Intraclass correlation coefficient for test–retest reliability was 0.849 (95% confidence interval [CI], 0.800–0.887), and COR was 8.14. Conclusions.: The Rasch-based linear-scale CVSS17 emerged as a useful tool to quantify CRVOS in computer workers., PROPÓSITO. Desarrollar una escala para medir los síntomas visuales y oculares (CRVOS) asociados al uso de videoterminales (VDT) en el trabajo: La escala CVSS17. METODOS. Se desarrolló un cuestionario piloto siguiendo el procedimiento recomendado. 636 sujetos lo completaron, y se evaluaron sus respuestas según el modelo de Rasch y estadísticas convencionales para crear el CVSS17. La validez y fiabilidad fueron evaluados mediante el ajuste al modelo de Rasch, el análisis de componentes principales (PCA), el índice de separación para los sujetos, el ‘‘funcionamiento diferencial de los ítems’’ (DIF) y el ajuste entre la dificultad de los ítems y la habilidad de los sujetos. Para evaluar la validez de constructo, el CVSS17 se correlacionó con una escala de molestias visuales [VDS] en 163 usuarios de VDT, este grupo completó dos veces el CVSS17 para calcular la fiabilidad test-retest (coeficiente de correlación intraclase [ICC] con su intervalo de confianza del 95% y coeficiente de repetibilidad [COR]). RESULTADOS. Los 17 ítems del CVSS17 investigan 15 síntomas diferentes, han demostrado buena fiabilidad y consistencia interna (Infit y Outfit en el intervalo [0.88–1.17], el autovalor del primer contraste del análisis PCA de los resultados era 1,37, la separación para los sujetos era 2.85; y no había DIF). El coeficiente de correlación de Pearson con la VDS fue 0.60 (P <0.001). El ICC fue 0.849 (IC al 95%, 0.800–0.887) y el COR 8,14. CONCLUSIÓN . El CVSS17 es un instrumento basado en el modelo Rasch, que proporciona una escala lineal apropiada para medir el nivel de CRVOS en trabajadores usuarios de VDT., Depto. de Optometría y Visión, Fac. de Óptica y Optometría, TRUE, pub

The growth of legumes, reduced tillage and addition of crop residues can be regarded as a good alternative in intercropping systems to increase soil organic matter, soil fertility and biodiversity while enhancing crop production and reducing the use of fertilizers. Despite the potential benefits, there is still a research gap about using the combination of cowpea and melon in intercropping to increase productivity and reduce external inputs. Thus, the aims of this study were to: i) assess if crop yield, crop quality and soil physicochemical properties can be improved by intercropping systems between melon (Cucumis melo L.) and cowpea (Vigna unguiculata (L.) Walp.) with reduced tillage and addition of crop residues, compared with a melon monoculture with intensive tillage and removal of crop residues, all grown under organic management; and ii) evaluated if cowpea grown as intercrop with fertilization reduced by 30% in the diversified plots can partially replace the use of fertilizers with no negative effects on total crop production. In this study we compared over three crop cycles monocrops with three different melon-cowpea intercropping patterns: mixed intercropping, row intercropping 1:1 (melon:cowpea) and row intercropping 2:1 (melon:cowpea). Our results, presented in this study, showed that intercropping systems, regardless of the pattern, kept soil organic C levels, while it significantly decreased in melon monoculture. Intercropping also significantly increased soil total N, available P and exchangeable K (0.13%, 62 mg·kg-1 and 387 mg·kg-1, respectively), compared to the melon monocrop (0.11%, 25 mg·kg-1 and 306 mg·kg-1). Total crop production was significantly higher under diversified systems, with land equivalent ratios > 1. Hence, the introduction of cowpea associated with melon, combined with reduced tillage and the incorporation of crop residues could be considered as a feasible strategy for sustainable agriculture, with environmental gains and economic

Background. To validate the 17-item Computer Vision Symptom Scale questionnaire (CVSS17) in Italian. Methods. Cross-sectional validation study on video terminal (VDT) users and a reference sample of subjects not working at a VDT (control group), cognitively able to respond to a health status interview. The Italian self-administered version of the CVSS17 questionnaire was administered to all participants. The reliability and validity of the Italian translation of the CVSS17 were tested using standard statistical methods for questionnaire validation. The Rasch analysis was performed as well. Results. A total of 216 subjects were enrolled. Concerning the reliability, the Cronbach’s alpha coefficient was 0.925 (from 0.917 to 0.924), and the test–retest stability was 0.91 (<0.001). Concerning the validity, the control group had significantly better scores, and there were good correlations between responses to the CVSS17 and analogous domains of the GSS. Conclusion. The Italian version of the CVSS17 has shown psychometric properties comparable to those of the Spanish version, having good validity, discriminatory power, internal consistency and reliability. The questionnaire is a specific measure of vision-related quality of life in Italian-speaking VDT workers and can be used both in clinical practice and for research purposes., Depto. de Optometría y Visión, Fac. de Óptica y Optometría, TRUE, pub

Received: 25 August 2022 / Revised: 14 November 2022 / Accepted: 15 November 2022 / Published: 17 November 2022, The Ocular Comfort Index (OCI) assesses ocular surface irritation and grades the severity of dry eye disease. This study sought to adapt the OCI questionnaire into Spanish, and then to assess the psychometric performance and validity of the new adapted version (OCI-versión española, OCIVE). The questionnaire was translated, back translated, and then cross-culturally adapted for use with Spanish-speaking individuals. The OCIVE was completed by 450 participants, including 53 subjects that were diagnosed with dry eye disease. Through a Rasch analysis, the psychometric properties of item fit, targeting, person separation, reliability, and differential item functioning (DIF) were assessed. To test the convergent validity, we examined the correlation between the OCIVE and the Computer Vision Symptom Scale (CVSS17). Validity was tested in a subgroup of participants with and without dry eye, and test-retest repeatability was determined in a subset of 151 individuals. We also compared, via DIF, the performance of the OCIVE with that of the original OCI. Our Rasch analysis revealed a good model fit, high accuracy, good targeting, unidimensionality, and no DIF according to gender. The validity and repeatability were good. The OCIVE shows comparable psychometric properties to the original English version, making it a valid tool for measuring dry eye symptoms in Spanish adults., Instituto de Salud Carlos III (ISCIII), Depto. de Optometría y Visión, Fac. de Óptica y Optometría, TRUE, pub

[SPA] El uso de leguminosas en cultivos asociados hortícolas puede jugar un importante papel tanto en el ciclo de nutrientes como en el ciclo de la materia orgánica y la actividad biológica del suelo. Estos efectos dependen de las especies elegidas para la asociación. Un manejo orgánico de los cultivos también tiende a reducir el impacto negativo que tienen los cultivos intensivos. Así, el objetivo de este estudio fue comparar el efecto de la asociación entre haba (Vicia faba L.) y broccoli (Brassica oleracea L. var. italica) sobre el contenido de humedad, el carbono orgánico del suelo (COS) y nutrientes en un ciclo de cultivo en comparación a los monocultivos de cada especie. En los cultivos asociados además se redujo la fertilización en un 30% con respecto al monocultivo. Los resultados mostraron que la asociación del haba con el brócoli incrementó significativamente el contenido de humedad del suelo, el COS y nutrientes como N, P, K y Mg. Por todo ello, el uso de las leguminosas, en este caso haba, parece una opción viable para mejorar la calidad y fertilidad del suelo, reduciendo el uso de fertilizantes, lo que conlleva a un ahorro en costes y un beneficio ambiental. [ENG] The use of legumes intercropping systems can play an important role both in the nutrient and organic matter cycles and in the biological activity of the soil. The results depend on the species chosen for the association. Organic crop management also tends to reduce the negative impact that intensive crops have. Thus, the objective of this study was to compare the effect of the association between fava bean (Vicia faba L.) and broccoli (Brassica oleracea L. var. italica) on the moisture content, soil organic carbon (SOC) and nutrients in a crop cycle compared to monoculture crops. In associated crops, fertilization was also reduced by 30% compared to monoculture. The results showed that the association of fava bean with broccoli significantly increased the moisture content of the soil, the SOC

El siguiente trabajo consiste en el estudio de un problema de una viga de hormigón armado de tres vanos simplemente apoyada, sometida a diferentes solicitaciones y el cálculo de su posterior armado siguiendo la nueva normativa española (el nuevo Código Estructural). Posteriormente se modelará la citada estructura en diversos programas de cálculo para la obtención y comparación de los resultados., The following work consists of the study of a problem of a simply supported three-span beam, made of reinforced concrete and subjected to different stresses and the calculation of its subsequent reinforcement following the new Spanish regulations (known as the Structural Code). Subsequently, the structure will be modeled in different calculation programs in order to obtain and compare the results, Departamento de Construcciones Arquitectónicas, Ingeniería del Terreno y Mecánica de los Medios Continuos y Teoría de Estructuras, Grado en Ingeniería Mecánica

Es habitual en el ámbito de la ingeniería estudiar el fenómeno de las vibraciones sobre los sistemas estructurales con el fin de conocer su comportamiento dinámico y poder así anticipar y prevenir cualquier fallo en servicio. Este movimiento oscilatorio depende fundamentalmente de las frecuencias naturales y sus correspondientes modos de vibración, parámetros estrechamente ligados a la masa y rigidez de la estructura. Como alternativa a la variación de apoyos y/o grados de libertad o a la aplicación de resortes, el presente trabajo se centra en la evaluación del uso de imanes temporales para actuar sobre la rigidez de la estructura y, por tanto, sobre su comportamiento dinámico. Tomando como referencia un sistema experimental real, se implementa el modelo equivalente en Matlab y se analiza de forma teórica la influencia del soporte magnético sobre la frecuencia fundamental y las propias oscilaciones de una viga biarticulada., It is common practice in the engineering field to study the phenomenon of vibrations associated to structural systems in order to know its dynamic behaviour and thereby anticipate and prevent any service failure. This oscillating movement depends primarily on natural frequencies and its vibration modes, which are closely linked to mass and stiffness of the structure. As an alternative to changing supports and/or degrees of freedom or implementing springs, the present work studies the use of temporary magnets to act on stiffness of the structure and, therefore, on its dynamic behaviour. Taking as a reference an experimental and real system, the equivalent Matlab model is implemented and the influence of the magnetic support on fundamental frequency and oscillations of a biarticulated beam is theoretically analysed., Departamento de Construcciones Arquitectónicas, Ingeniería del Terreno y Mecánica de los Medios Continuos y Teoría de Estructuras, Grado en Ingeniería Mecánica