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Miramontes, de León Diego. "Modèle global de poutre pour l'analyse sismique des portiques en béton armé : approche phénoménologique et approche en plasticité". Lyon, INSA, 1996. http://www.theses.fr/1996ISAL0103.
Pełny tekst źródłaThe study of the damage process and the vulnerability to collapse of RC structures under earthquake loading requires the formulation of numerical models capable of describing the nonlinear behaviour of structural members. However, the nonlinear dynamic analysis of complete structures results in a considerable volume of calculus. Consequently, the numerical tools-kits should be specialized in order to improve their efficiency. In this work, a global model for the seismic analysis of RC beam systems is proposed. A first phenomenological approach is characterized by a uniaxial cyclic law based on a moment-curvature relationship. In this uncoupled formulation a negligible variation of the normal force is supposed. The simplified kinematic and material hypotheses allow the prediction of key phenomena: cracking of concrete, yielding of steel and the strength degradation du to cyclic loading. A second approach based on the theory of plasticity extend to the domain of applicability to complex loading. This formulation takes into account the interaction of normal force and flexion. The proposed kinematic hardening rule is supported by the phenomenological moment-curvature relation-ship. Finally, both approaches are compared to experimental results. Several structural members and subassemblies are subjected to different loading conditions. The obtained numerical results confirm the interest of the proposed model and at the same time, suggest the extension for spatial cases. The proposed model unify the efficiency and reliability. It offers the possibility to carry out a systematic application of nonlinear analysis of current RC structures
Boucher, Jonathan. "Développement d'une poutre de béton armé de bambou préfabriquée pour l'habitat urbain de Hanoi". Thesis, Université Laval, 2006. http://www.theses.ulaval.ca/2006/23928/23928.pdf.
Pełny tekst źródłaThis thesis relates on the development of a precasted concrete floor intended for the urban habitat of Hanoi and more particularly to the prefabrication of a concrete beam reinforced with bamboo. A part of this research was carried out jointly with Mr. Dany Blackburn which was interested to low cost housing and gas concrete slabs. Initially, our work consisted in drawing up the portrait of the local construction market to seize the principal realities and stakes of them. The observations carried out on the ground at summer 2002 are thus presented in the first part of this thesis. In the second part, a recension of writings gives a progress report on the current state of the most recent publications on the bamboo reinforced concrete technology. With the information collected on the ground and listed in the literature, the principal objective of this thesis was carried out: the prefabrication of a concrete beam reinforced with bamboo. The third part of research exposes the methodology used during the experiments. Finally, a real size prototype of the prefabricated floor system was assembled. The model is composed of 3 concrete beams reinforced with bamboo and 10 gas concrete slabs produced by Dany Blackburn within its report. Mechanical tests were then carried out to measure the structural effectiveness of the concrete beams reinforced with bamboo and of the prefabricated floor system. The results presented in the last part of this thesis show that the bamboo as concrete reinforcement in the prefabrication of beams are an interesting alternative and can be used effectively for the residential construction of Hanoi.
Nguyen, Xuân Huy. "Vulnérabilité des structures en béton armé à voiles porteurs : expérimentation et modélisation". Grenoble INPG, 2006. http://www.theses.fr/2006INPG0049.
Pełny tekst źródłaThis work is done in the framework of the ECOLEADER program - European consortium of laboratories for earthquake and dynamic experimental research - to improve our knowledge on the vulnerability of reinforced concrete structural walls submitted to seismic loadings. A modelling strategy based on Euler - Bernoulli or Timoshenko multifiber beams is presented. Constitutive laws are based on plasticity for steel and damage mechanics for concrete. This simplified model permits to reproduce the global behaviour of reinforced concrete structures under dynamic loading. Critical zones and damage distributions are also correctly predicted. Non linear dynamic calculations are the only ones able to simulate the variation of the axial force and thus they are a necessary tool for the design and conception of new buildings
Iskef, Alaa Eddin. "Technologies informatiques pour l'étude du comportement expérimental et numérique d'un assemblage poutre-poteau en béton armé". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN015/document.
Pełny tekst źródłaThe behavior of reinforced concrete beam-column joints and their influence on the strength of the structures under cyclic or seismic loadings has been the subject of several investigations in recent years. However, the behavior of that part of the structure remains far from being mastered due to the complexity of the assembly involving several physical phenomena and due to the lack of exhaustive experimental data. This work aims to implement and provide a reliable and dense experimental database whose vocation is to provide access to an experimental benchmark to enable the modeling and validation of the behavior of these assemblies
Aitali, Méhéna. "Contribution à l'étude de la fiabilité des poutres hyperstatiques en béton armé". Toulouse, INSA, 1992. http://www.theses.fr/1992ISAT0031.
Pełny tekst źródłaKotronis, Panagiotis. "Cisaillement dynamique de murs en béton armé : modèles simplifiés 2D et 3D". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2000. http://tel.archives-ouvertes.fr/tel-00074469.
Pełny tekst źródłaNgo, Minh Duc. "Renforcement au cisaillement des poutres béton armé par matériaux composites naturels (fibre de Lin)". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1169/document.
Pełny tekst źródłaIn the field of construction, concrete is the most common material used to construct buildings, bridges... With its great history, there are a large number of structures that is found degraded for many reasons such as road accidents, changes in traffic, load changes in buildings or climate action ...To resolve these issues, two main options available to project owners: the reconstruction or repair. Reconstruction is an interesting solution but is very expensive and cannot be applied to all structures (historical works ...). The second solution is often used to keep the structures under service conditions. A repair methods commonly used is the application of composite materials to strengthen reinforced concrete structures. The relatively acceptable cost and rapid implementation make this technical solution increasingly appreciated. The Flax fiber is a natural material which has good mechanical properties. At present, the flax fiber is applied in several areas: automotive, sports ... In the civil engineering field, with its good mechanical properties, flax fiber can be used in the field of building Reinforced Concrete structures substitution of regular fibers (carbon fiber, fiberglass ...) The aim of this thesis is the evaluation of the ability to use flax fibers in strengthening reinforced concrete beams. The study will focus on a case of shear reinforcement that is not well documented in the literature; it will be compared with the reinforcement with carbon fibers. The experimental program was carried out on 3-point bending tests with the support of load approach for a strong shear in the area concerned on rectangular beams and T-beams. The beams are reinforced by bidirectional flax fabrics and unidirectional reinforcement and different configurations. The calculation standards ACI, FIB, CSA, CNR-DT ... recommended to calculate structures with carbon reinforcements and glass in building for shear strengthening are applied to ensure their effectiveness in the case of a reinforcement flax fibers. Finally, a numerical model is being studied by the finite element method to reproduce the behavior of beams reinforced with natural fiber to study the parameters that play an important role in shear strengthening of concrete beams reinforced with flax fiber. The results show that the reinforcing flax fiber has significant effects in the shear reinforcement of reinforced concrete beams (increase in shear resistance of 10% to 33%). The reinforcement by flax fiber has a mechanical capacity equivalent to that of carbon fiber in the shear reinforcement of reinforced concrete beams and potential in strengthening reinforced concrete structure. The results of the numerical model by the finite element method reflect a behavior similar to those obtained during the experimental tests. The model also valid flax fiber capacity comparable to that of carbon fiber in the shear strengthening of reinforced concrete beams
Capdevielle, Sophie. "Introduction du gauchissement dans les éléments finis multifibres pour la modélisation non linéaire des structures en béton armé". Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI109/document.
Pełny tekst źródłaThe present work is dedicated to the numerical modeling of structures using multifiber beam elements. This numerical method was proved to be efficient to simulate the behavior of slender structural elements subject to normal stresses. However, the response of the model for shear-dominating stresses lacks of accuracy. This problem is addressed by introducing warping in the kinematics of multibfiber beam elements. A new multifiber element is developed in two steps. Torsional warping is first introduced in the deformations of an arbitrary-shaped composite cross section. The resulting warping profiles are validated by comparison with the axial displacements obtained by three-dimensional modeling of beams in torsion. After implementation of the warping kinematics in a Timoshenko multifiber beam element, the formulation is validated against the experimental behavior of beams subject to pure torsion. The material is modeled by a 3D damage law, and warping is updated throughout the computations to account for damage evolution. A comparison of torque–twist curves predicted with enhanced and classical beam elements to experimental curves highlights the importance of including warping in the model. The second step consists in formulating an element with additional warping degrees of freedom, accounting for the warping deformations due to both transverse shear and torsion. This element is validated using an analytical model for a beam subject to transverse shear. Then the linear elastic behavior of a beam subject to both shear and torsion is successfully compared to the results of a 3D simulation. The complete formulation is coupled to damage through an implicit soulution procedure for the beam and the warping degrees of freedom. The enhanced method is eventually used to compute the behavior of a full structure subject to a seismic loading
Breysse, Denys. "Pour une optimisation discrète des structures en béton armé". Paris 6, 1986. http://www.theses.fr/1986PA066021.
Pełny tekst źródłaReimeringer, Mathieu. "Contribution à l'étude de l'effondrement d'une structure en béton armé". Orléans, 2005. http://www.theses.fr/2005ORLE2022.
Pełny tekst źródłaUlm, Franz-Josef. "Modélisation élastoplastique avec endommagement du béton de structure. Application aux calculs statiques et dynamiques de structures en béton armé et béton précontraint". Phd thesis, Ecole Nationale des Ponts et Chaussées, 1994. http://tel.archives-ouvertes.fr/tel-00529366.
Pełny tekst źródłaGuérin, Marie-Claude. "Renforcement à l'effort tranchant de poutres en béton armé". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0005/MQ33666.pdf.
Pełny tekst źródłaLapierre, Patrick. "Modélisation de poutres en béton armé renforcées avec de matériaux composites". Mémoire, Université de Sherbrooke, 1999. http://hdl.handle.net/11143/6909.
Pełny tekst źródłaPinto, Barbosa Mônica. "Semi-rigidité des nœuds d'ossatures en béton armé : simulations numériques". Lyon, INSA, 1992. http://www.theses.fr/1992ISAL0035.
Pełny tekst źródłaWithin the framework of finite element modelling of reinforced concrete structure the present study investigates the behaviour of beam-column connexion submitted alternate cyclic loading. The objective of this work is to simulate the behaviour of a frame Joint, to show the mechanisms observed and to contribute to the construction of models which takes them into account. This report is structured in three chapters : The first chapter presents a state-of-the-art of the experimental and numerical studies in this field, with particular reference to the semi-rigidity concept. It includes a discussion of the mechanisms taken into account in the design of frame Joints, and points out the assumptions and options selected. In the second part, the analytical models used are presented, as well as the numerical methods which are best suited. The last chapter is dedicated to the numerical simulation of the reinforced concrete frame joints under alternate cyclic loading. The deformation mechanisms are exemplified and a number of recommendations towards research needs are proposed
Yu, Linwen. "Étude du développement de la corrosion dans le béton armé fissuré et de la performance mécanique de poutres en béton armé corrodées". Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8791.
Pełny tekst źródłaRésumé : Un des objectifs de la thèse est d'étudier le développement de la corrosion dans le béton armé fissuré, en fonction de l’enrobage des armatures, des conditions d’exposition, de l’endommagement de l’interface acier-béton induit par le chargement et des défauts de l'interface acier-béton sous les barres horizontales liés à la mise en œuvre du béton frais en prenant en compte l'auto-cicatrisation des fissures transversales. L'autre objectif est d'étudier la performance mécanique des poutres en béton armé endommagées par la corrosion naturelle en ambiance agressive (des cycles humifification/séchage en brouillard salin). Deux parties principales constituent cette thèse. La première partie traite du développement de la corrosion, à la fois initiation et propagation, dans le béton armé en présence de fissures. La deuxième partie traite de la performance mécanique des poutres longues et courtes endommagés par la corrosion des armatures, en termes de mode de défaillance, seuil de plastification, capacité ultime résiduelle et flèche ultime à rupture. Les résultats de l'étude expérimentale confirment que la corrosion est toujours initiée dans les fissures induites par le chargement. Il convient de noter que la corrosion est liée à la présence des fissures mais pas à leur largeur. Les conditions d'exposition sont également un paramètre important influençant le développement de la corrosion. Ainsi, une surface tendue correspondant à la surface supérieure est la pire condition d'exposition, parce que le développement de la corrosion est accéléré par les effets de l’accumulation des chlorures ainsi que l’effet gravitaire favorisant leur pénétration. En outre, les dommages induits par le “top-cast effect” qui sont formés à l'interface acier-béton sous les barres horizontales par le ressuage et le tassement du béton frais, sont favorables à la fois à la l’initiation et à la propagation de la corrosion. Le phénomène d’auto-cicatrisation des fissures survient lorsque les échantillons fissurés sont conservés à 100% d'humidité relative en raison de la formation d'ettringite dans la zone intérieure et de la calcite dans la zone extérieure du plan de fissuration. L’auto-cicatrisation réduit le débit d'air à travers les fissures et réduit considérablement le risque de corrosion. Les performances en flexion de poutres longues ont été testées. La corrosion des armatures modifie le mode de défaillance des poutres en béton armé. La diminution de la charge de plastification et de la capacité ultime a été corrélée à la perte de section transversale des barres tendues. Les résultats expérimentaux indiquent qu’une réduction de 1% de la section transversale correspond à une réduction de 1% de la charge de plastification et de la capacité ultime. En ce qui concerne les performances mécaniques des poutres courtes, les résultats montrent qu’une corrosion sévère par piqûres sur les armatures tendues change le mode de défaillance par cisaillement à celui en flexion. Le mode de rupture des poutres courtes corrodées dépend non seulement du ratio entre la portée et la hauteur utile, mais également du degré de corrosion des cadres d’effort tranchant.
Confrere, Adeline. "Développement d'une méthode d'analyse structurelle de bâtiments en béton armé : application aux poutres renforcées par des armatures PRF". Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10045/document.
Pełny tekst źródłaThe corrosion of steel elements embedded in concrete was identified as the main cause of structural deteriorations and deficiencies in buildings. Repair and rehabilitation costs in the USA, Canada and most European countries represent a substantial percentage of expenses related to infrastructures. Alternative FRP reinforcements in glass, carbon or basalt have been studied for the past twenty years owing to their resistance to corrosion, their light weight and their considerable tensile strength. The mechanical properties of fiber-reinforced polymers with an elastic behavior differ to the mechanical properties of steel, with an elastic-plastic behavior. This induces a change of the dimension calculations of the structure. In particular, in the case of a standard reinforced concrete beam, the flexural ultimate strength would usually be located in the reinforcements in traction for steel reinforcements, while a crushing failure of the concrete would be preferable in FRP beams. The objective of this thesis is to better understand the system {concrete + fiber-reinforced polymer reinforcements} in view of dimensioning building structures with these alternative reinforcements. These FRP reinforcements have already been used for bridge decks and magnetic suspension train tracks but no applications have been found for buildings except a few rare cases of hospital buildings or rooms adjoined to others containing magnetic apparatus, for example Magnetic Resonance Imagery (MRI), which are reinforced with FRP reinforcements to avoid resonance problems. Even if FRP reinforcements would appear to be a promising solution in terms of corrosion problems, designers and engineers have been confronted with many questions relative to the use of these materials in a building application, both in terms of the mechanics involved for the structures and economic and environmental issues. This thesis is therefore focused on the design aspect of concrete structures comprising innovating and more durable reinforced concrete
Ho, Manh Hung. "Performance en flexion des poutres en béton hybride CFRP armé". Thesis, Reims, 2020. http://www.theses.fr/2020REIMS004.
Pełny tekst źródłaThe study on strengthening or repairing reinforced concrete structures by bonding composite materials has been widely carried out for more than two decades. The mechanical and physical advantages on flexural strength, shear strength, mechanical behaviour, durability, reinforcement efficiency have been well approved. The methods of reinforcement by composite materials can be distinguished as internal reinforcement, external reinforcement and hybrid reinforcement. In this work, the hybrid reinforced concrete beams were studied. Reinforcement in bending is provided by steel and composite materials, CFRP plate. Two bonding methods between the concrete surface and the CFRP plate surface are proposed: direct bonding and bonding using an epoxy resin layer. In this study, three different series of hybrid-reinforced beams were used: a direct bond between the two materials, the second with an adhesive bond between the two materials and the last with a specific bond. The mechanical performance of these beams, mechanical behaviour, failure modes, ultimate load, load corresponding to the first cracks in the concrete, load corresponding to the plasticization of the longitudinal steel and the influence of the adhesion between the concrete surface and the surface of the CFRP plate were analysed. The numerical finite element method was also used to analyse the mechanical performance of the beams. The results provide new knowledge on the mechanical advantages of hybrid reinforced concrete beams
Michaud, Éric. "Résistance en cisaillement des poutres en béton armé renforcé de fibres d'acier et synthétiques avec analyse de l'effet d'échelle". Mémoire, Université de Sherbrooke, 2014. http://savoirs.usherbrooke.ca/handle/11143/167.
Pełny tekst źródłaAli, Harith abdullah ali. "Etude expérimentale et numérique des poutres continues en béton armé renforcées ou réparées par collage des matériaux composites". Thesis, Reims, 2017. http://www.theses.fr/2017REIMS034/document.
Pełny tekst źródłaThe flexural strengthening of RC beams by external bonding of composite materials has proved to be an efficient and practical technique. This thesis presents a study on the flexural performance of reinforced concrete continuous beams with three spans repaired or strengthened by bonding carbon fiber reinforced polymer (CFRP) or glass fiber reinforced polymer (GFRP). The experimental program consists of two groups. Group-1 consists of eight beams and group-2 consists of eight beams. In each group, there is a reference beam, unreinforced beam. All beams have the same length of 9m and the same section of 15x25 (cm). The experimental tests with the monotonic loading were carried out using a 1000 kN press. The parameters studied are effect of reinforcement by CFRP and GFRP, the optimum thickness of the strengthening, repair efficiency of the beams damaged by CFRP and GFRP, mechanical behavior, the rupture modes of strengthened reinforced concrete beams. Experimental tests and calculations by numerical simulation were carried out. Five modes of the breaking of the beams were observed. The maximum strength of a beam can be improved by 14.8 and 33.0% for beams reinforced by CFRP bonding and between 7.2 and 11.8% by bonding GFRP. There is an optimum thickness of the reinforcement in the three spans of the beam. The fully damaged beam can be repaired at 100%. The maximum bending moment of the damaged and repaired beam becomes greater than that of the reference beam. A numerical study, using the finite element method with the help of ABAQUS software, on strengthening the continuous concrete beams, was also carried out
Fritih, Youcef. "Apport d’un renfort de fibres sur le comportement d’éléments en béton autoplaçant armé". Toulouse, INSA, 2009. http://eprint.insa-toulouse.fr/archive/00000336/.
Pełny tekst źródłaDespite Fibre Reinforced Self-Compacting Concrete (FRSCC) offers economic and technical benefits in building applications, few studies have been undertaken on this material which is actually not much used, except for some precast elements (sheet piles, tunnel segments. . . ). The object of this thesis is to expand the potential of application of this concrete at structural elements more common, particularly the flexural postcracking response of reinforced concrete beams. In this case, can reinforcement fibre take a part of the tensile stress due to shear ? If yes, the partial or total substitution of transverse reinforcement is for studying. An experimental program was conducted to provide answers to the various questions raised about the use of fibres in the crack opening and the transfer tensile stress near crack. Analysis of experimental results illustrates the double effect of the fibre-reinforcement which controls cracking and maintains a tensile stress transfer near crack. In structural element, cracking is strongly influenced by fibre-reinforcement: the number of cracks is increased and in return it results in reduced crack opening a trend expected to improve the durability of the application according to Eurocode 2 [EN 1992-1-1 2004]. The shear performance of the steel FR-SCC beams demonstrated the potential for steel fibers to be used to satisfy the minimum shear reinforcement criteria. However, the effect of fibre reinforcement on the shear behaviour in failure is limited because of a low volume of fibres. Moreover these fibres are not efficient for crack opening above 200 microns
Croston, Tania. "Etude expérimentale du comportement d'une poutre en béton armé en flexion trois points réparée par matériaux composites (approche probabiliste)". Phd thesis, Paris, ENSAM, 2006. http://pastel.archives-ouvertes.fr/pastel-00002602.
Pełny tekst źródłaDesprez, Cédric. "Analyse et Réduction de la Vulnérabilité Sismique des Structures Existantes : Renforcement par Collage de Tissus de Fibres de Carbone (TFC)". Phd thesis, Grenoble INPG, 2010. http://tel.archives-ouvertes.fr/tel-00560438.
Pełny tekst źródłaDesprez, Cédric-Arthur. "Analyse et réduction de la vulnérabilité sismique des structures existantes : renforcement par collage de tissus de fibres de Carbone (TFC)". Grenoble INPG, 2010. http://www.theses.fr/2010INPG0115.
Pełny tekst źródłaIn structural engineering, the seismic vulnerability reduction of existing structures is an important issue. Retrofitting by Polymer Reinforced Fibres (FRP) is an interesting response in order to fulfil this aim. This paper presents a simplified modelling strategy to predict the behaviour of reinforced concrete structures upgrade with FRP. A nonlinear finite element method is used, based on multifiber beams with damage and plasticity models. Retrofitting of flexural element (wall, beam) and column confinement are studied. More specifically, a confined concrete constitutive law suitable for monotonic and cycling loadings is proposed. The model is inspired on two well-known concrete laws, one based on damage mechanics theory (La Borderie) and the other based on experimental studies (Eid & Paultre). Validation of the strategy is provided using two case studies: a retrofitted bridge pier and a vulnerability assessment on an existing building trough static (Pushover) and dynamic analysis
Bitar, Ibrahim. "Modélisation de la rupture dans les structures en béton armé par des éléments finis poutres généralisées et multifibres". Thesis, Ecole centrale de Nantes, 2017. http://www.theses.fr/2017ECDN0013.
Pełny tekst źródłaThis thesis, carried out within the framework of the French national project SINAPS@, aims to develop generalized and multifiber finite beam elements to simulate the behavior of reinforced concrete structures till failure. The Timoshenko finite element beam formulation introduced by (Caillerie, et al., 2015) is chosen as the starting point. This formulation is free of shear locking and uses high order shape functions to interpolate the transversal displacement and rotation fields. The formulation of (Caillerie et al., 2015) is first compared with other finite element beam formulations existing in the literature and validated for linear and non-linear calculations. A kinematic enhancement of the axial displacement field is proposed in order to improve the element’s ability to reproduce the interaction between the axial force and flexural moment. In order to model the behavior of a structure till failure, the embedded finite element method is adopted. This method consists in enhancing the kinematics by introducing a displacement discontinuity variable to reproduce the crack. The enhancement is first applied at the section level and then at the fiber level and thus two new formulations, a generalized Timoshenko beam and a multifiber Timoshenko beam, are proposed. The enhancement of the displacement field provides objective global responses and the ability to reproduce the structural behavior till failure. The performance of the new elements is validated by numerical studies and comparisons with experimental results
Ovigne, Pierre-Alexandre. "Comportement vibratoire de poutres en béton armé fissurées avec renfort en matériau composite". Lyon 1, 2001. http://www.theses.fr/2001LYO10267.
Pełny tekst źródłaDavid, Emmanuelle. "Comportement mécanique de poutres en béton armé renforcées ou réparées par collage de matériaux composites : étude expérimentale et modélisation". Artois, 1999. http://www.theses.fr/1999ARTO0201.
Pełny tekst źródłaDuprat, Frédéric. "Fiabilité des poteaux d'ossatures en béton armé à noeuds non déplaçables". Toulouse, INSA, 1993. http://www.theses.fr/1993ISAT0029.
Pełny tekst źródłaSaidou, Sanda Mamar. "Évolution des propriétés dynamiques de poutres en béton armé endommagées en laboratoire". Mémoire, Université de Sherbrooke, 2015. http://hdl.handle.net/11143/8017.
Pełny tekst źródłaRezaie, Freydoon. "Étude du comportement en flexion de poutres en béton armé corrodé : modélisation moment-courbure modifié prenant en compte le raidissement en traction du béton fissuré". Lille 1, 1999. https://pepite-depot.univ-lille.fr/LIBRE/Th_Num/1999/50376-1999-119.pdf.
Pełny tekst źródłaFrantzeskakis, Cléarchos. "Contribution à la modélisation des stuctures en béton armé par la méthode des éléments finis". Phd thesis, Ecole Nationale des Ponts et Chaussées, 1987. http://tel.archives-ouvertes.fr/tel-00529454.
Pełny tekst źródłaHabita, Mohamed Fouzi. "Contribution à l'étude de l'incidence de l'alcali-réaction sur le comportement mécanique des poutres en béton armé". Lyon 1, 1992. http://www.theses.fr/1992LYO10251.
Pełny tekst źródłaKreit, Amjad. "Prolongation de la durée de vie des ouvrages en béton armé". Thesis, Toulouse, INSA, 2012. http://www.theses.fr/2012ISAT0059/document.
Pełny tekst źródłaThe effectiveness of the NSM technique for repairing or strengthening the RC structures is highly dependent on the bond strength behavior between CFRP rods and concrete. Many recent studies have been conducted to evaluate bond strength on undamaged concrete specimens because of the complexity of this problem. On the contrary, the behavior of repaired specimens may be affected, first, by pre-loading conditions, and the other, depending on specific damage that could be encountered in the existing structures. Indeed, damage in concrete or in reinforcement can change the global behavior of repaired elements by reducing the bearing capacity.First, large-scale bending tests were carried out to study the behavior of reinforced concrete beams. On the one hand, various types of damage were considered such as the steel corrosion and excessive loads. On the one hand, different pre-loading conditions including sustaining loads at the time of implementation repair were studied. The behavior of the beam strengthened control is distinguished by its fragile side which is accompanied by sudden failure due to pull-out of the CFRP NSM rod, followed by splitting of concrete pieces in the concrete cover and a crushing of concrete in compressive zone. On the other hand, the failure mode of corroded repaired beam occurred by concrete cover delamination in the tension zone at the level of insertion of CFRP NSM rod that started between two bending cracks in the central area and has spread to the support. Then, in order to understand the origin of the failure mode, global behavior, stiffness, ductility, and bearing capacity of repaired corroded beam, an experimental tests were performed by varying the parameters relating to the consequences of corrosion (such as generalized loss of bottom steel section, concrete cover delamination failure and bond strength failure between concrete and reinforcing steel). However, the failure occurred by the concrete cover delamination between two adjacent bending cracks was never obtained on the repaired corroded beam. For our simulations: The failure was due to pull-out of CFRP rod. In all cases, the bearing capacity measured for repaired damaged beams was greater than that of control beam (non-repaired).Finally, since the structures requiring repair by applying composite materials are not recent, and consequently, number of damages occurred due to mechanical stress (long-term sustained overloading, short term accidental load), an experimental part was interested in the use of CFRP NSM rods to repair of beams damaged by excessive load, and then repaired under or without sustained load. A damage can slightly reduce the bearing capacity of the repaired beams (less than 8% compared to the strengthened control beam). The repair of beams under sustained load has a non-significant effect by reducing the bearing capacity between 5% and 6% compared to the damaged beams repaired without sustained load. The damages of the pre-loaded RC beams repaired with NSM failed by the tearing of the carbon rod "pull-out" due to the longitudinal cracks developed in the epoxy resin volume, which leads to loss of adhesion between the CFRP rod and the sealing material by slightly reducing their bearing capacity. While, the RC beams damaged by overloading which were repaired showed a different mode of failure (crushing of concrete in compression) with also a significant reduction in their ultimate bearing capacity values
Jehel, Pierre. "Modélisation numérique des phénomènes d'amortissement par dissipation d'énergie matérielle dans les structures de type portique en béton armé sous séisme". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00477015.
Pełny tekst źródłaNazé, Pierre-Alain. "Contribution à la prédiction du dommage des structures en béton armé sous sollicitations sismiques : proposition d'amélioration pour l'évaluation de la nocivité d'un signal et du dommage pour les structures à ossatures : introduction à l'analyse fiabiliste de l'endommagement en fonction de la nocivité d'un signal sismique". Lyon, INSA, 2004. http://theses.insa-lyon.fr/publication/2004ISAL0078/these.pdf.
Pełny tekst źródłaSince prediction of earthquake still remains impossible, foreseeing structural damages due to seismic motion has become a key point in earthquake engineering. This work aims at evaluating the relevance of classical seismic signal damaging potential indices and at proposing improvement of these indices in order to provide better prediction of structural damage due to earthquake. The first part supplies a non exhaustive state of the art of main Damaging Potential Indices IP and Damage Indices ID used in earthquake engineering. In the second part, IP/ID correlations results are analysed in order to evaluate IP relevance, to justify displacement based approach use (capacity spectrum method) for damage prediction and to make good the proposal for improvement of Damaging Potential Index. But studding seismic signal damaging potential is usually not enough to foresee damage firstly because scalar representation of damaging potential is not easy to link to physics reality and secondly because of damage scattering often observed for a single value of seismic signal damaging potential. In the same way, a single damage index value may correspond to very different structural damage states. Hence, this work carries on with a contribution to damage index reliability improvement, able to detect real structural damage appearance as well as to quantify this damage by associating the distance between one structural sate and the structural collapse, defined as an instability
Hamdan, Ziad. "Evolution de la corrosion des aciers du béton armé en ambiances agressives". Toulouse, INSA, 1993. http://www.theses.fr/1993ISAT0024.
Pełny tekst źródłaBroutian, Garéguine. "Modèle global de plasticité pour l'analyse des portiques en béton armé sous chargements monotones et cycliques". Lyon, INSA, 2000. http://www.theses.fr/2000ISAL0050.
Pełny tekst źródłaThe development of building construction codes is essentially based on the analysis of the behavior of structures and/or of members tested in laboratory. The constant evolution of computers promotes more or Jess fine numerical modelling (local, semi-global multifiber bearn or global approaches) which are able to appropriately describe different deformation patterns, guiding the design and optimising the experimental studies. This work concerns the development of a plasticity based global model, aiming the simulation of the non linear behaviour of R/C frames and members under monotonie and cyclic loading with predominant bending. The proposed model is integrated in the general purpose program CASTEM2000 of the French Commission of Atomic Energy (CEA). We have first studied the experimental behaviour ofR/C frames and their members in order to identify different deformation mechanisms which are sometimes highly coupled already in the monotonic stage of the behaviour. The observed phenomena have been accounted for by different techniques of modelling that the analysis leads us to consider a plasticity based global approach complementarily with a semi-global one. The proposed global R/C section model is characterized by one yield surface expressed in generalized variables (N, My, Mz), a non linear kinematic hardening rule and a non associated flow The simplified assumptions (kinematic and material) preserve however the prediction of key phenomena: cracking of the concrete, yielding of steels, deterioration of the stiffness, cyclic dissipation. The proposed approach offers otherwise the possibility to consider the coup ling between different generalised forces. The confrontation of the results of the mode! to the experience as well as to those issued from global decoupled, multifiber and local modelling shows the interest of the proposed approach
Thang, Anh Long. "Évaluation de la dégradation du béton par ondes ultrasonores". Lille 1, 2006. http://www.theses.fr/2007LIL10164.
Pełny tekst źródłaLamothe, Philippe. "Essais de renforcement avec des matériaux composites pour des poutres de pont en béton armé". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0032/MQ67296.pdf.
Pełny tekst źródłaPouliot, Patrice. "Abaques pour le dimensionnement du renforcement externe en matériaux composites de poutres en béton armé". Mémoire, Université de Sherbrooke, 2001. http://savoirs.usherbrooke.ca/handle/11143/1144.
Pełny tekst źródłaPham, Ba Hung. "Modèle en effort résultants pour dimensionnement optimal deds portiques en béton armé". Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2009. http://tel.archives-ouvertes.fr/tel-00538958.
Pełny tekst źródłaHasnaoui, Fadhila. "Modélisations simplifiées pour l’analyse du risque sismique de bâtiments en béton armé". Thesis, Paris 10, 2014. http://www.theses.fr/2014PA100082.
Pełny tekst źródłaThis PhD is part of the MARS project (Advanced Methods for Seismic Risk, EDF R&D). It relates particularity to the development of simplified and robust calculation. The overall aim is to significantly reduce the intensive computation time without loosing a reliable simulation of the seismic response of reinforced concrete buildings methods. Seismic risk analysis requires a very large number of repeated calculations to account for uncertainties of both the loading (seismichazard) and the nonlinear behaviour of structures. ln the first part of this work, a bibliographic study on seismic resolution models for reinforced concrete buildings is provided. This step allows collecting the maximum of necessary elements to understand and identify all the parameters, advantages, disadvantages and limits of use of each finite element calculation method. In the second part, a macro—elements for beam—column joint associated to a nonlinear behavior to reflect the response to the structure under seismic loads ls developed. Kinematic assumptions have been adopted to limit the number of degrees of freedom. The law of global shear behavior is described in the context of plasticity. A model with kinematic hardening is chosen to account for the dissipation due to cracking. Model parameters are identified from experimental results or pre-calculated by analysis on a local scale vla 3D finite element calculation or the implied "Modihed Compression Field Theory Numerical analyses were performed to validate the proposed approach against experimental tests available in the literature
Aouameur-Mesbah, Amel. "Analyse non-linéaire matérielle et géométrique des structures coques en béton armé sous chargements statiques et dynamiques". Phd thesis, Ecole Nationale des Ponts et Chaussées, 1998. http://tel.archives-ouvertes.fr/tel-00529774.
Pełny tekst źródłaDavenne, Luc. "Modélisation de l'influence des armatures transversales sur le comportement non linéaire d'éléments de béton armé". Paris 6, 1990. http://www.theses.fr/1990PA066099.
Pełny tekst źródłaAl, Mahmoud Firas. "Technologie de renforcement des poutres en béton armé par l’insertion de joncs de carbone". Toulouse, INSA, 2007. http://www.theses.fr/2007ISAT0031.
Pełny tekst źródłaThe aim of the experimental program developed in this work is to investigate the possibility of using Carbon Fiber Reinforced Polymer (CFRP) rods to strengthen concrete structural members with the Near Surface Mounted reinforcement (NSM) technique. We study some physical and mechanical proprieties of CFRP rods and their interaction with the concrete. Bonding at the interface between the CFRP rod and the filling material and that between the filling material and the old concrete is studied. The global behavior both of reinforced concrete beams strengthened by NSM technique and subjected to flexure and of cantilever beams is investigated. We make an important parametric study of some variables. The experimental results are compared with the analytical and finite–element calculations of the principal limit states. The failure moments of beams in various failure modes are also compared. Finally, the stiffness of the strengthened beams during loading and unloading cycles is studied by analytical and Finite Element methods. The experimental results indicate that strengthening concrete structural members with the Near Surface Mounted reinforcement technique gives very satisfactory results
Attari, Nasser Eddine. "Réhabilitation et renforcement des poutres et noeuds en béton armé par des matériaux composites". Lorient, 2010. http://www.theses.fr/2010LORIS186.
Pełny tekst źródłaA large number of existing buildings are faced with a lack of strength which may seriously compromise the security of persons in the case of seismic shaking. These buildings, conceived initially for vertical loading, were rarely designed and constructed so as to take up lateral seismic shaking movements. In the aim of improving the strength of these existing buildings, and hence attenuate the risks that may be induced, their rehabilitation and strengthening are of a strategic interest. The glued reinforcing technique in composite materials is widely being used as a new strengthening technique in structures. This technique is particularly interesting for the repair and strengthening of reinforced concrete structures. In the aim of reducing the cost and ensuring a relatively more ductile behaviour for the strengthened reinforced concrete elements, the addition of glass fibres could be considered as a replacement solution since glass fibres are relatively more deformable and with a lesser cost compared to carbon fibres. In this sense, the present work aims at evaluating the efficiency of external strengthening in FRP fabric (glass, carbon) on reinforced concrete elements. The study evaluate the influence and the efficiency of external strengthening of reinforced concrete beams and reinforced concrete bam-column joints using glass-FRP and carbon-FRP tissues in different strengthening configurations. These configurations combine the separate use of carbon fibres and glass fibres tissues unidirectional with a U-shaped anchorage, together with a bidirectional hybrid fabric glass-carbon fibre. A total of ten reinforced concrete beams and eleven reinforced concrete beam-column joints, were strengthened and tested under cyclic loading for the beams and alternate loading for the joints. The testing data analysed concerned the strength, the stiffness, the ductility and the failure mode. They clearly show that the strengthening configuration in a U-shape has considerably improved the flexural strength and contributed to the redistribution of internal forces, enabling the deformations of beams to increase. The use of a hybrid strengthening pattern glass-carbon unidirectionally was more efficient. It represents an advantageous solution for the strengthening of reinforced concrete structures
Vololonirina, Oly Miharisoa. "Contribution à l'évaluation des capacités des glycérophosphates pour la maintenance dans le béton armé". Toulouse 3, 2011. http://thesesups.ups-tlse.fr/1818/.
Pełny tekst źródłaCorrosion inhibitors are chemical substances used to decrease the corrosion rate of concrete rebars. This work focuses on a sodium and lithium glycerophosphate based inhibitor, to be applied on the hardened surface of concrete and commercialised by PAREX LANKO. Besides the main products, which are constituted by isomers alpha and beta of glycerophosphates, the commercial product contains by-products of synthesis. The main objectives of the thesis are the physical and chemical characterization of the inhibitor, the study of its possible interaction with concrete especially the eventual reactions with the cement matrix, the type of penetration of the inhibitor through concrete and its influence on the transfer properties as well as its efficiency toward corrosion by means of electrochemical measurements. The experimental study of these different aspects is synthesised thanks to a numerical modelling
Combescure, Christelle. "Formulation d’un modèle homogénéisé de plaque en béton armé pour des applications sismiques". Paris 6, 2013. http://www.theses.fr/2013PA066407.
Pełny tekst źródłaSafety reassessments are periodically performed on the EDF nuclear power plants and the recent seismic reassessments leaded to the necessity of taking into account the non-linear behaviour of materials when modeling these reinforced concrete buildings. A constitutive model dedicated to reinforced concrete plates under seismic solicitations is proposed: the DHRC model. Justified by a periodic homogenisation approach, this model includes two dissipative phenomena: damage of concrete and sliding at the interface between steel rebar and surrounding concrete. An original coupling term between damage and sliding, resulting from the homogenisation process, induces a better representation of energy dissipation during the material degradation. The model parameters are identified from and a restricted number of geometric and material characteristics. Numerical validations of the DHRC model are presented, showing good agreement with experimental behaviour
Lefebvre, Eric. "Stratégie de modélisation pour suivre des fissures existantes dans une structure en béton armé précontraint". Thesis, Paris Sciences et Lettres (ComUE), 2016. http://www.theses.fr/2016PSLEM069/document.
Pełny tekst źródłaThe difficulty of predicting cracks on reinforced concrete structures is due to the heterogeneity of the concrete and the dependence on environmental boundary conditions. To overcome this problem, we introduce directly a potential crack at the initial time, using cohesive zone models. A major difficulty will be to juggle the cohesive zone models describing cracking and the phenomena of creep and drying, and thus to consider three types of nonlinearities appearing in the calculation : cracking, decohesion of steelconcrete and creep. We also propose a strategy to represent an initially cracked structure. In this thesis, the crack behavior in different parts of the confinement building are modeled using the above described method
Christelle, Combescure. "Formulation d'un modèle homogénéisé de plaque en béton armé pour des applications sismiques". Phd thesis, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-00880279.
Pełny tekst źródłaTong, Yun Yun. "Traitement électrochimique de réalcalinisation pour la préparation du béton armé dégradé par carbonatation". Paris 6, 2009. https://tel.archives-ouvertes.fr/tel-01349734.
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