Browsing by Author "Guindos Bretones, Pablo"
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- ItemA Comprehensive Review on Recycling of Construction Demolition Waste in Concrete(2023) HERBERT SINDUJA J; Thamilselvi Pachiappan; SIVA AVUDAIAPPAN; Nelson Maureira; Angel Roco-Videla; Guindos Bretones, Pablo; P. F. Parra
- ItemA new multi-spring element to simulate clt connections under combined loadings(2023) Chacon De La Cruz, Matías Fernando Nicolás; Guindos Bretones, Pablo; Montano, J.A new numerical model of five uncoupled spring elements is proposed to simulate the panel-to-panel Cross-Laminated Timber (CLT) connections made of discrete fasteners. The model accurately simulates the main phenomenological effects in the translational and rotational directions of connections: asymmetrical axial gap (open/closure), in-plane and out-of-plane sliding of panels, and radial/bending stiffness/strength of fasteners. Linear/nonlinear spring elements with different constitutive material models for each phenomenological effect are considered. For instance, a modified Richard-Abbott model is used for the radial/bending hysteresis of fasteners. The model is implemented in the ANSYS software through user elements and material routines. An illustrative example under different loading conditions is elaborated to show the main capabilities of the proposed model. Finally, the model is validated with two experimental monotonic in-plane CLT slab tests, where the initial/hardening stiffness, strength capacity, and failure mechanism of both specimens are correctly predicted.
- ItemA simplified approach to assess the technical prefeasibility of multistory wood-frame buildings in high seismic zones(2022) Berwart, S.; Estrella, X.; Montaño, J.; Santa-María, H.; Almazán, J.L.; Guindos Bretones, Pablo
- ItemA theoretical approach between dfa/dfd design strategies and modular timber technologies(2024) Gutiérrez, Nohelia; Negrão, João; Dias, Alfredo; Guindos Bretones, PabloPrefabrication and modular construction have impacted the global market, and with the increased focus on sustainability, these construction technologies are leaning towards implementing timber systems. Design for Adaptability (DfA) and Design for Disassembly/Deconstruction (DfD) are strategies used to face unpredicted events (such as structural reinforcement, repair needs, or new user demands), assure long-lasting efficiency, and enhance materials sustainably, thus upgrading the building's adaptability. While in the literature, there are projects focused on the functional and environmental challenges of taller timber buildings and the DfA/DfD benefits, little research is available on the application of DfA/DfD of timber buildings, particularly in prefabrication and modular timber construction, owing to the barriers to the implementation and development of the sestrategies. Consequently, the relationship between adaptability and two critical parameters, flexibility and durability, given their crucial role in the design and construction processes and how they enable DfA/DfD strategies, was first reviewed in this paper. The next step was exploring the combination of DfA/DfD strategies and integrating them with the features of prefabricated construction/ modular timber technologies to describe a theoretical approach for developing adaptable buildings. Finally, the gaps analyzed between the parameters, design strategies, and prefabricated construction/modular technologies in some projects to understand their possibilities and limitations. Thus, the paper aims to describe an initial theoretical approach, identifying knowledge gaps and addressing research needs between parameters, design strategies, and technologies to enhance timber buildings.
- ItemBibliometric Review of Prefabricated and Modular Timber Construction from 1990 to 2023: Evolution, Trends, and Current Challenges(2024) Gutierréz, Noelia; Negrao, Joao; Dias, Alfredo; Guindos Bretones, PabloDue to its inherent characteristics, such as a light weight and ease of workability, timber is ideal for prefabricated and modular construction. However, since the research in this field covers a wide range of niches such as structural engineering, building physics, design for assembly and disassembly, and life cycle analysis, among others, and since there has been considerable development of the field in past years—boosted by new mass timber products and tall timber construction—it is difficult to critically analyze the current state of the art, current trends, and research challenges. Therefore, this research aimed to cover a systematic review of 409 articles to assess the field of prefabricated and modular timber construction critically. The methodology comprised a co-word network approach using the Science Mapping Analysis Software Tool (SciMAT, Version 3) to illustrate their evolution from 1990 to 2023. The findings show that the circular economy and digital technologies significantly impact the development of these technologies, which can potentially provide practical solutions for designing buildings with a circular approach and improving productivity and efficiency in the construction process. However, it is essential to acknowledge a notable deficiency in the research and understanding of these subjects. Therefore, various sectors must take the lead in conducting a thorough reassessment to enhance research and development in the field. Finally, the findings from this research can significantly contribute to existing knowledge and serve as a comprehensive platform for the further exploration of prefabricated and modular timber construction
- ItemCase study: Seismic and gravitational design of 15-story office and residential building archetypes with a semirigid clt diaphragm and reinforced concrete shear walls in Chile(World Conference on Timber Engineering (WCTE), 2025) Barrios Pi, Sebastián Andres; Veliz Sanzana, Fernando Daniel; Berwart Astudillo, Sebastián Ignacio; Montaño Castañeda, Jairo Alonso; Araya Miranda, Raúl Eduardo; Lagos, Guzmán Jorge; Beltrán Beltrán, Martín Aleksei Ignacio; Chacón De La Cruz, Matías Fernando Nicolás; Valdivieso Cascante, Diego Nicolás; Guindos Bretones, Pablo; Almazan Campillay, José Luis; Santa María, Oyanedel HernanThis study is part of the "Ciudad Madera" technological consortium, which seeks to promote widespread wood construction in Chile, whose seismic code provides no guidance for cross-laminated-timber (CLT) seismic diaphragms. Currently, this lack of a design methodology for Hybrid Mass-Timber-Reinforced-Concrete (HMT-RC) buildings, has pushed a tendency for structural designers to solely rely on the concrete topping as the seismic horizontal diaphragm element. This study validates HMT - RC and develops a seismic-design method for buildings up to 15 stories high, with CLT floor system performing as the seismic diaphragm. Twenty monotonic/cyclic connector tests and six full-scale 4 m × 4 m Radiata-pine CLT diaphragm tests will calibrate nonlinear models of office and residential building archetypes, analyzed in a 72-case parametric matrix (height, seismic zone, soil class, design philosophy). Findings show: (i) RC-core and coupling-beam detailing governs drift, (ii) flooring size is controlled by a vibration criterion, and (iii) commercial timber column-to-column splices meet seismic inter-story rotation demands.
- ItemCryo-Electron Tomography 3D Structure and Nanoscale Model of Arabidopsis thaliana Cell Wall(2018) Sarkar, P.; Kowalczyk, M.; Apte, S.; Yap, E.G.; Das, J.; Adams, P.D.; Bajaj, C.; Guindos Bretones, Pablo; Auer, M.
- ItemCyclically Loaded Copper Slag Admixed Reinforced Concrete Beams with Cement Partially Replaced with Fly Ash(2022) Sumathy Raju; Jagadheeswari Rathinam; Brindha Dharmar; Sasi Rekha; Siva Avudaiappan; Mugahed Amran; Kseniia Usanova; Roman Fediuk; Guindos Bretones, Pablo; Ramkumar Velayutham Ramamoorthy
- ItemDeveloping of a highly stiff and ductile reinforced connection concept with enhanced pinching for timber structures(2021) Araya Segovia, Raúl Aldo Andrés; Guindos Bretones, Pablo; Pontificia Universidad Católica de Chile. Escuela de IngenieríaEn ingeniería de la madera, conexiones rígidas suelen estar acompañadas con penalizaciones en términos de ductilidad, sin mencionar problemas asociados al desempeño sísmico, como el pinching. Esta investigación presenta un nuevo concepto de refuerzo para conexiones titulado Gap Reinforced Fastened Connection (GRFC) que evita los problemas de rigidez-ductilidad y el pinching en la madera. El refuerzo se lleva a cabo mediante la adhesión vía epoxi de una placa de acero a la madera, luego se incorpora una segunda placa de acero distanciada un cierto gap respecto al plano de corte del conector. El mecanismo de falla consiste en forzar el desarrollo de las rótulas plásticas de los conectores al interior de este gap, evitando el aplastamiento de la madera, obteniendo un comportamiento dependiente solo de las propiedades de los conectores y de la interacción de estos con las placas de refuerzo. Los resultados experimentales han mostrado que, si bien el pinching no ha sido eliminado totalmente, este se reduce considerablemente. Esta reducción está directamente relacionada con el diámetro del conector utilizado, mostrando un mejor comportamiento mecánico para diámetros pequeños. Tanto los valores de rigidez como de ductilidad de la GRFC clavada fueron superiores a los valores de conexiones no reforzadas reportados en la literatura, alcanzando hasta 3.96 y 4.71 veces los valores de rigidez y ductilidad, respectivamente. La incorporación del GRFC permite reducir drásticamente el espaciamiento entre conectores, permitiendo utilizar los espaciamientos prescritos para acero, dado que el refuerzo elimina el riesgo de los efectos de grupo que desencadenan los modos de falla frágiles de la conexión. Mediante la incorporación del concepto GRFC se evita el típico trade-off entre rigidez y ductilidad de las conexiones de madera, permitiendo mejorar el rendimiento de conexiones rígidas que requieran una alta ductilidad, como por ejemplo las conexiones hold-down o de marcos de momento.
- ItemDevelopment of an amplified added stiffening and damping system for wood-frame shear walls(2020) Montaño, J.; Maury, R.; Almazán, J.L.; Estrella, X.; Guindos Bretones, Pablo
- ItemDevelopment of Sustainable Timber Construction in Ibero-America: State of the Art in the Region and Identification of Current International Gaps in the Construction Industry(2022) Raúl Araya; Alfredo Guillaumet; Ângela do Valle; María del Pilar Duque; Guillermo González-Beltrán; José Manuel Cabrero; Enrique De León; Francisco Castro; Carmen Sara Nohelia Gutiérrez Escajadillo; João Negrão; Laura Moya; Guindos Bretones, Pablo
- ItemEffect of Density on Acoustic and Thermal Properties of Low-Density Particle Boards Made from Agro-Residues: Towards Sustainable Material Solutions(2025) Rao K.M.C.; Sheshagiri M.B.; Ramamoorthy R.V.; Amran M.; Nandanwar A.; Vijayakumar P.; Avudaiappan S.; Guindos Bretones, PabloThis study assessed the feasibility of using major agricultural residues specifically bagasse, rice straw, wheat straw, and coir fiber to produce single-layer particle boards. These boards of densities 300, 400, and 500 kg/m³ were developed using melamine urea formaldehyde resin. Comprehensive evaluation of the boards included determination of their sound absorption coefficient (SAC), thermal conductivity, and noise reduction coefficient (NRC), as well as various physical properties and modulus of rupture. Additionally, the impact of board density on the SAC across a frequency range of 50 to 5000 Hz was examined. The coir boards displayed superior SAC, particularly at 3000 Hz. Rice straw boards at a density of 300 kg/m³ exhibited the lowest thermal conductivity (0.098 W/m-K). Density of 300 kg/m³ was optimal for achieving the highest SAC and lowest thermal conductivity in agro residue particle boards. As the density of the boards increased, SAC decreased, whereas thermal conductivity (K) increased, indicating that lower-density boards are more effective as sound and thermal insulators. Furthermore, all particle boards demonstrated promising sound absorption capabilities, achieving classifications of D and E under ISO 11654:1997, making them viable for interior applications in the building industry.
- ItemEffect of Design Parameters on the Flexural Strength of Reinforced Concrete Sandwich Beams(2022) Chakrawarthi, V.; Raj Jesuarulraj, L.; Avudaiappan, S.; Rajendren, D.; Amran, M.; Guindos Bretones, Pablo; Roy, K.; Fediuk, R.; Vatin, N.I.
- ItemEffect of Steel Fiber on the Strength and Flexural Characteristics of Coconut Shell Concrete Partially Blended with Fly Ash(2022) R Prakash; Nagarajan Divyah; srividhya; Siva Avudaiappan; Mugahed Amran; Sudharshan N. Raman; Guindos Bretones, Pablo; Nikolai Ivanovich Vatin; Roman Fediuk
- ItemEffects of Admixtures on Energy Consumption in the Process of Ready-Mixed Concrete Mixing(2022) V Arularasi; Thamilselvi Pachiappan; Siva Avudaiappan; Sudharshan N. Raman; Guindos Bretones, Pablo; Mugahed Amran; Roman Fediuk; Nikolai Ivanovich Vatin
- ItemEfficient nonlinear modeling of strong wood frame shear walls for mid-rise buildings(2020) Estrella Arcos, Edisson Xavier; Guindos Bretones, Pablo; Almazán Campillay, José Luis; Malek, S.
- ItemEnergy and structural optimization of mid-rise light-frame timber buildings for different climates and seismic zones in Chile(2024) Wenzel Schwarzenberg, Alexander; Vera Araya, Sergio Eduardo; Guindos Bretones, Pablo; CEDEUS (Chile)Location determines not only the climatic condition but also the structural loads that the structure must withstand. Given the broad variety of climatic and seismic requirements of Chile, the design of lightweight timber buildings considering both energy and seismic design parameters and boundary conditions becomes a difficult task. The main objective of this research is to analyze and quantify the effect of climates, seismic loads, lateral anchorage, and story number on the optimal energy design solutions, including the seismic behavior in a light-frame timber building. Furthermore, the optimal design was parametrically analyzed considering five Chilean cities that consider different climates, seismic zone, number of stories, and lateral anchorage systems to prevent rocking (overturning) due to lateral seismic forces. The optimal wall insulation thickness, stud spacing, and thermal mass exhibited significant variations depending on the buildings' number of stories, lateral anchorage system, climate, and seismic zone. Therefore, the results of this investigation reinforce the necessity of integrating energy and seismic designs for light-frame timber buildings. The optimal designs obtained in this investigation showed considerable variations depending on the combination of climatic and seismic loads as well as the number of stories and anchoring systems. The article's main contributions are the evidence of the structural and energy design interconnection of light-frame timber buildings and how design variables, such as stud spacing, floor concrete thickness layer, and wall insulation thickness, are related and change according to the different climates, seismic loads, lateral anchorage, and story number.
- ItemEnergy and structural optimization of mid-rise light-frame timber buildings: Analyzing different climates and seismic zones(2023) Wenzel Schwarzenberg, Alexander Antonio; Vera, S.; Guindos Bretones, PabloThe location determines not only the structural loads but also the climate one timber structure must withstand. Given the broad variety of climatic and seismic conditions of Chile, this country may be regarded as a natural laboratory for analyzing how energetic and structural requirements of design are interrelated. In fact, the optimal design of timber buildings considering both energetic-thermic and structural-seismic requirements can be a very difficult task. The main objective of this research was to analyze and quantify the effect of climates, seismic loads, lateral anchorages, and story number on the optimal designs of light-frame timber buildings. This has been analyzed by conducting a parametric analysis of a coupled numerical model considering five Chilean cities' that considerably differ in terms of climates, seismic risk, numbers of stories and lateral anchorage systems. A case study building that adequately represent the typical national archetype was chosen for the analysis. The results indicate that the optimal wall insulation thickness, stud spacing, and thermal mass exhibited significant variations depending on the buildings' number of stories, lateral anchorage system, climate, and seismic zone. Therefore, the results of this investigation reinforce the importance, or rather, necessity of performing holistic designs of timber buildings, since the optimal buildings’ designs obtained in this investigation shown considerable variations and evidence the interconnection of requirements. In the future, more sophisticated models should be constructed to further considering in design additional requirements other than structural and energetic, which should facilitate and optimize the design and competitivity of wood in construction.
- ItemEvaluation of the seismic behavior of hybrid walls with timber for buildings in Chile(2022) Carrero Roa, Tulio Enrique; Guindos Bretones, Pablo; Santa María Oyanedel, Hernán; Pontificia Universidad Católica de Chile. Escuela de IngenieríaActualmente, se puede considerar que existen cuatro sistemas dominantes de madera estructural resistente a corte lateral como lo son los muros de corte con estructura de madera ligera marcoplataforma (Light Frame Timber Buildings, LFTB) y muros de paneles de corte de madera laminada encolada (Glued Laminated Timber. GLULAM) contralaminada (Cross Laminated Timber, CLT) y muros de madera microlaminada (Laminated venner lumber, LVL). Con el tiempo, se ha demostrado una mejora en el comportamiento sísmico de las estructuras tradicionales de madera con ensayos experimentales, pero la construcción de edificios de mediana y gran altura en países con alta sismicidad presenta importantes inconvenientes con este tipo de muros de corte. En el caso de las estructuras LFTB, son adecuadas para edificios de mediana altura, pero generalmente no tienen suficiente capacidad de carga lateral. Por otro lado, la principal dificultad en las estructuras de CLT es la rotación del cuerpo rígido del muro y la falta de ductilidad. Esta rotación rígida aumenta notablemente los desplazamientos laterales de entrepisos, lo que limita drásticamente la posibilidad de cumplir con los desplazamientos máximos de entrepisos establecidos en el Código Chileno en NCh 433. En este contexto, el objetivo principal de esta tesis doctoral ha sido estudiar la capacidad de carga lateral y el efecto de la conexión entre los componentes de los muros híbridos de corte, ya que se asume que es necesario estructuras híbridas y nuevas tipologías de muros para que los edificios de madera de gran altura mejoren el rendimiento estructural en países altamente sísmicos. Además, los sistemas propuestos han sido diseñados para ser un sistema estructural competitivo en el contexto de la construcción industrializada. Por lo tanto, se asume que los conjuntos propuestos son una solución viable para las empresas de madera prefabricada. La investigación incluye la caracterización experimental de los sistemas propuestos a través de ensayos cíclicos y monotónicos mediante el estándar Europeo EN12512 (protocolo de carga para ensayos). Además, se han realizado estudios numéricos para evaluar las implicaciones de las soluciones propuestas, que incluyeron análisis no lineales. Los resultados de este trabajo permitieron proponer dos muros de cortante mucho más fuertes, rígidos y dúctiles en comparación con los muros de cortante de madera tradicionales, esos sistemas consistieron en: (a) Un entramado de perfiles de acero con paneles de revestimiento CLT, y (b) un marco de madera laminada más paneles de OSB como revestimiento interno.
- ItemExperimental and Numerical Characterization of the Influence of a Smoldering Cellulosic Substrate on a Cigarette’s Ignition Propensity Test(2018) Guindos Bretones, Pablo; Patel, A.; Kolb, T.; Meinlschmidt, P.; Schlüter, F.; Plinke, B.