Now showing items 1-20 of 151

    A coupled CFD-DEM model for sand production in oil wells 

    Climent Pera, Natalia (Date of defense: 2016-10-17)

    During the oil recovery a hole is drilled, the sandstone is left unsupported next to the cavity and disloged sand grains can enter the oil recovery system. This process is called sand production and several problems may ...

    A double-porosity formulation for the THM behaviour of bentonite-based materials 

    Vasconcellos, Ramon Barboza de (Date of defense: 2021-05-18)

    The thermo-hydro-mechanical (THM) behaviour of expansive clays has been extensively studied in the last decades due to the potential use of bentonites as components of engineered barrier systems (EBS) in deep geological ...

    A machine learning based material homogenization technique for masonry structures 

    Kalkbrenner, Philip (Date of defense: 2021-11-03)

    Cutting-edge methods in the computational analysis of structures have been developed over the last decades. Such modern tools are helpful to assess the safety of existing buildings. Two main finite element (FE) modeling ...

    A micromechanical study of the Standard Penetration Test 

    Zhang, Ningning (Date of defense: 2020-01-20)

    This thesis explores the potential of models based on the discrete element method (DEM) to study dynamic probing of granular materials, considering realistic particle-scale properties. The virtual calibration chamber ...

    Accelerated cementitious matrices : hydration, microstructure and mechanical strength 

    Salvador, Renan Pícolo (Date of defense: 2016-12-12)

    Sprayed concrete is widely used as structural support for the stabilization of tunnel walls and underground constructions. The performance of sprayed cementitious matrices containing accelerators is strongly related to ...

    Activación alcalina de residuos urbanos e industriales para la construcción de piezas prefabricadas 

    García Díaz, Yineth Paola (Date of defense: 2023-09-27)

    (English) A comprehensive evaluation of various industrial and urban by-products was conducted to determine their potential as precursors for alkali-activated materials (AAM) in Spain. Over 15 by-products were identified ...

    Advanced computationally efficient modeling of RC structures nonlinear cyclic behavior 

    Alfarah, Bashar (Date of defense: 2017-06-09)

    Under severe seismic excitation, structural behavior of buildings and other constructions is highly complex. It involves, among other issues, soil-structure interaction, large strains and displacements, damage, plasticity, ...

    Advanced image analysis techniques for laboratory experiments on soils 

    Parera Morales, Ferran (Date of defense: 2020-01-27)

    The understanding of soil behavior is the foundation where the geotechnical engineering is built on. Experimentation is essential to improve this comprehension, and then to be able to translate it into models, theories, ...

    Analyse multi-échelle de l'approche énergétique de la rupture des grains au sein de matériaux granulaires 

    Salami, Younes (Date of defense: 2017-01-11)

    Au cours des dernières années, les analyses multi-échelles en mécanique des sols granulaires deviennent de plus en plus répandues. L’avantage de ce type d’approches réside dans leur capacité à établir un lien entre les ...

    Analysis of seismic pounding of moderate-height RC buildings with aligned slabs 

    Kharazian, Alireza (Date of defense: 2017-11-23)

    Collision between adjoining buildings is relevant, since the huge impact forces significantly modify the buildings dynamic behaviour. The separation required by the regulations avoids pounding; however, even in recent ...

    Analysis of underground excavations in argillaceous hard soils : weak rocks 

    Mánica Malcom, Miguel Ángel (Date of defense: 2018-10-11)

    Materiales arcillosos rígidos, que se encuentran en la zona de transición entre suelos duros y rocas blandas, están siendo considerados actualmente en varios países como la roca huésped para el almacenamiento geológico ...

    Análisis estructural probabilista orientado a evaluación del daño sísmico con aplicaciones a tipologías constructivas empleadas en Costa Rica 

    Hidalgo Leiva, Diego (Date of defense: 2017-01-30)

    The damage assessment of structures under seismic actions, must seek the implementation of new theories, tools and procedures that reduce the uncertainty associated to the expected structural response of a building. This ...

    Análisis estructural probabilista orientado a evaluación del daño sísmico de edificios de mampostería no reforzada: aplicación a edificios aislados y agregados del distrito del Ensanche de Barcelona 

    Ávila Haro, Jorge Arturo (Date of defense: 2021-07-01)

    Despite the fact that masonry is one of the oldest and most used building materials, the number of existing studies and experimental data, as well as the applicability of its results (i.e. extrapolation), are substantially ...

    Análisis estructural sísmico de edificios de acero : un enfoque probabilista 

    Díaz Alvarado, Sergio Alberto (Date of defense: 2017-09-18)

    The main objective of this thesis is the probabilistic assessment of the expected seismic damage in steel buildings located in Mexico City. Although a deterministic analysis is performed both, seismic actions and buildings, ...

    Análisis numérico termo-mecánico y termo-higrométrico del hormigón expuesto a altas temperaturas 

    Rodríguez Frete, Mariana (Date of defense: 2020-12-16)

    Concrete is one of the most used materials in construction, and its application spans to all kinds of structures. For this reason, concrete has been the subject of intense study. In spite of that, there are still apects ...

    Aportaciones al proyecto, construcción y reparación de pavimentos de hormigón 

    López Carreño, Rubén-Daniel (Date of defense: 2018-07-31)

    The construction and conservation of road networks represent a major part of public expenditure. For instance, the EU-28 countries annually spend approximately EUR 20.000 million on roadway preservation. These figures ...

    Application of observability techniques to structural system identification including shear effects 

    Emadi, Seyyedbehrad (Date of defense: 2020-12-11)

    According to Timoshenko’s beam theory, nodal rotations in beam-like structures are produced by bending and shear effects. On the one hand, bending rotations can be easily calculated by the Euler-Bernoulli stiffness matrix ...

    Assessment of chloride corrosion in steel fibre reinforced cementitious composites 

    Vieira, Mylene de Melo (Date of defense: 2018-10-19)

    High performance steel fibre reinforced cementitious composites (HPSFRCCs) show enhanced structural performance and durability. The improved properties favour its use in agressive conditions (such as marine environment) ...

    Backanalysis methodology based on multiple optimization techniques for geotechnical problems 

    Santos Rodríguez, Cristian de (Date of defense: 2015-12-10)

    Nowadays, thanks to the increase of computers capability to solve huge and complex problems, and also thanks to the endless effort of the geotechnical community to define better and more sophisticated constitutive models, ...

    Building information modeling for facility managers 

    Alavi, Hamidreza (Date of defense: 2022-10-11)

    A Decision Support System (DSS) can help facility managers to improve building performance, occupants’ comfort, and energy efficiency during the Operation and Maintenance (O&M) phase. These DSSs are normally data-intensive ...