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Angelakos, Bill. "The behavior of reinforced concrete knee joints under earthquake loads." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/NQ41091.pdf.
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Dale, Kenneth William 1971. "Behaviour of tubular connections under variable repeated loads." Monash University, Dept. of Civil Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/8848.
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Li, Huawei. "Dynamic performance of reinforced concrete beams and joints subjected to impact loads." Thesis, Curtin University, 2021. http://hdl.handle.net/20.500.11937/84205.
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This thesis performs analytical, numerical and experimental studies to investigate the influences of various parameters that affect the drop-weight impact tests, and the impact responses of monolithic and precast reinforced concrete beams, and beam-to-column joints. Influences of the drop weight test setup configurations and measurement methods on impact force and impact response of beams are examined. Performances of precast concrete beams and beam-to-column joints subjected to impact loads and their impact resistance capacities are investigated.
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Srinivasan, Shiva. "Characterization of stresses induced in doweled joints due to thermal and impact loads." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2186.
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Thesis (M.S.)--West Virginia University, 2001.Title from document title page. Document formatted into pages; contains x, 114 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 108-113).
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Zarco-GonzaÌlez, JoseÌ Carlos. "Analysis of damage progression in composite joints subjected to bearing and by-pass loads." Thesis, Oxford Brookes University, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.432764.
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Lo, Clifford Fook Leong. "Behaviour and design of eccentrically loaded bolted connections." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63986.
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Al-Mukhtar, Ahmed. "The safety analysis concept of welded components under cyclic loads using fracture mechanics method." Doctoral thesis, Technische Universitaet Bergakademie Freiberg Universitaetsbibliothek "Georgius Agricola", 2010. http://nbn-resolving.de/urn:nbn:de:bsz:105-qucosa-39477.
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Fracture Mechanics process of Welded Joint is a very vast research area and has many possibilities for solution and prediction. Although the fatigue strength (FAT) and stress intensity factor (SIF) solutions are reported in several handbooks and recommendations, these values are available only for a small number of specimens, components, loading and welding geometries. The available solutions are not always adequate for particular engineering applications. Moreover, the reliable solutions of SIF are still difficult to find in spite of several SIF handbooks have been published regarding the nominal applied SIF. The effect of residual stresses is still the most challenge in fatigue life estimation. The reason is that the stress distributions and SIF modified by the residual stresses have to be estimated. The stress distribution is governed by many parameters such as the materials type, joint geometry and welding processes. In this work, the linear elastic fracture mechanics (LEFM), which used crack tip SIFs for cases involving the effect of weld geometry, is used to calculate the crack growth life for some different notch cases. The variety of crack configurations and the complexity of stress fields occurring in engineering components require more versatile tools for calculating SIFs than available in handbook’s solutions that were obtained for a range of specific geometries and load combinations. Therefore, the finite element method (FEM) has been used to calculate SIFs of cracks subjected to stress fields. LEFM is encoded in the FEM software, FRANC, which stands for fracture analysis code. The SIFs due to residual stress are calculated in this work using the weight function method. The fatigue strength (FAT) of load-carrying and non-load carrying welded joints with lack of penetration (LOP) and toe crack, respectively, are determined using the LEFM. In some studied cases, the geometry, material properties and loading conditions of the joints are identical to those of specimens for which experimental results of fatigue life and SIF were available in literature so that the FEM model could be validated. For a given welded material and set of test conditions, the crack growth behavior is described by the relationship between cyclic crack growth rate, da/dN, and range of the stress intensity factor ( K) , i.e., by Paris’ law. Numerical integration of the Paris’ equation is carried out by a FORTRAN computer routine. The obtained results can be used for calculating FAT values. The computed SIFs along with the Paris’ law are used to predict the crack propagation. The typical crack lengths for each joint geometry are determined using the built language program by backward calculations. To incorporate the effect of residual stresses, the fatigue crack growth equations which are sensitive to stress ratio R are recommended to be used. The Forman, Newman and de Konig (FNK) solution is considered to be the most suitable one for the present purpose. In spite of the recent considerable progress in fracture mechanics theories and applications, there seems to be no, at least to the author’s knowledge, systematic study of the effect of welding geometries and residual stresses upon fatigue crack propagation based completely on an analytical approach where the SIF due to external applied load (Kapp) is calculated using FEM. In contrast, the SIF due to residual stresses (Kres) is calculated using the analytical weight function method and residual stress distribution. To assess the influence of the residual stresses on the failure of a weldment, their distribution must be known. Although residual stresses in welded structures and components have long been known to have an effect on the components fatigue performance, access to reliable, spatially accurate residual stress field data are limited. This work constitutes a systematic research program regarding the concept for the safety analysis of welded components with fracture mechanics methods, to clarify the effect of welding residual stresses upon fatigue crack propagationDie Bewertung einer Schweißnaht ist ein großes Forschungsgebiet und hat viele Möglichkeiten für Lösungskonzepte und Vorhersagen. Obwohl für die Schwingfestigkeit und die Spannungsintensitätsfaktor (SIF)-Lösungen in verschiedenen Handbüchern Empfehlungen ausgewiesen sind, sind diese Werte nur für eine geringe Anzahl von Proben, Komponenten, Belastungsfälle und Schweißgeometrien verfügbar. Die vorhandenen Lösungsansätze sind nicht immer für spezielle technische Anwendungen geeignet. Darüber hinaus sind zuverlässige bewährte Lösungen von Spannungsintensitätsfaktoren immer noch schwierig zu finden, obwohl verschiedene SIF-Handbücher mit Hinweis auf den anliegenden nominalen SIF veröffentlicht sind. Der Einfluss von Eigenspannungen ist eine der größten Herausforderungen bei der Lebensdauerabschätzung. Aufgrund der Tatsache, dass infolge der Eigenspannungen sowohl die Spannungsverteilung als auch der SIF verändert werden, muss eine Abschätzung erfolgen. Die Spannungsverteilung wird durch viele Parameter beeinflusst, wie zum Beispiel den Werkstoff, die Nahtgeometrie und den Schweißprozess. In der vorliegenden Arbeit wurde für die Berechnung des Ermüdungsrisswachstums unter verschiedenen Kerbfällen das Konzept der linear-elastischen Bruchmechanik (LEBM) verwendet, welches K-Lösungen für die Rissspitze bei unterschiedlichen Fällen der Schweißgeometrie berücksichtigt. Aufgrund der Komplexität der Risskonfigurationen und der Spannungsfelder in praxisrelevanten Komponenten werden weitere Hilfsmittel zur Berechnung von Spannungsintensitätsfaktoren benötigt, welche die herkömmlichen Lösungen in Handbüchern erweitern. Deshalb wurde die Finite Elemente Methode (FEM) zur Berechnung von Spannungsintensitätsfaktoren an Rissen verwendet. Die LEBM wird in der FEMSoftware FRANC berücksichtigt. Die aus Eigenspannungen resultierenden Spannungsintensitätsfaktoren wurden mit Hilfe der Gewichtsfunktionsmethode berechnet. Die Ermüdungslebensdauer (Schwingfestigkeit) von tragenden und nichttragenden Schweißnähten mit ungenügender Durchschweißung beziehungsweise Kerbriss wurden mit Hilfe der LEBM durch Integration der Zyklischen Risswachstumskurve ermittelt. Zur Validierung des FEM-Modells konnte in einigen untersuchten Fällen auf experimentelle Ergebnisse zur Lebensdauer und zum SIF aus der Literatur zurückgegriffen werden, wo identische Geometrien, Materialeigenschaften und Belastungsverhältnisse der Naht vorlagen. Unter Vorgabe des Werkstoffes und der Prüfbedingungen wurde das Risswachstumsverhalten mit dem Zusammenhang von Risswachstumsgeschwindigkeit da/dN und zyklischem Spannungsintensitätsfaktor K mit dem Paris-Gesetz beschrieben. Eine numerische Integration der Paris-Gleichung erfolgte über ein FORTRAN-Programm. Die damit erhaltenen Ergebnisse sind als Ermüdungslebensdauer (Schwingfestigkeit) verwendbar. Die berechneten SIF‘en entlang der Paris-Geraden werden zur Vorhersage des Risswachstums benutzt. Die typischen Risslängen für jede Nahtgeometrie wurden mit Hilfe des eigens integrierten Programmes ermittelt. Zur Berücksichtigung des Einflusses von Eigenspannungen wird empfohlen, Risswachstumsgleichungen zu nutzen, die empfindlich auf das Spannungsverhältnis R reagieren. Für die vorliegende Zielsetzung gilt der Lösungsansatz nach Forman, Newman und de Konig (FNK) als der am besten geeignete. Trotz der jüngsten, beträchtlichen Fortschritte in den bruchmechanischen Theorien und Anwendungen sind systematische Studien zum Einfluss der Schweißgeometrie und der Eigenspannungen auf das Ermüdungsrisswachstum, in welchen der SIF aufgrund extern anliegender Beanspruchungen (Kapp) mit der FEM berechnet wurde, in der Literatur kaum vorhanden. Im Gegensatz dazu wurde der SIF infolge von Eigenspannungen (Kres) mit Hilfe der analytischen Gewichtsfunktionsmethode und der Eigenspannungsverteilung berechnet. Um den Einfluss von Eigenspannungen auf das Versagen einer Schweißverbindung abzuschätzen, muss deren Verteilung bekannt sein. Obwohl die Wirkung von Eigenspannungen auf das Ermüdungsverhalten in geschweißten Strukturen und Komponenten schon lange bekannt ist, ist der Zugriff auf verlässliche und präzise Daten von räumlichen Eigenspannungsfeldern begrenzt. Bezüglich einer konzeptionellen Sicherheitsanalyse von geschweißten Komponenten mit bruchmechanischen Methoden begründet diese Arbeit einen systematischen Ansatz, um den Einfluss von Schweißeigenspannungen auf das Ermüdungsrisswachstum zu verdeutlichen
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Guivarch, Damien. "Méthodes et outils d'aide à l'estimation des efforts sur les ensembles mécaniques en phase d'architecture. Application aux hélicoptères." Electronic Thesis or Diss., Toulouse, INSA, 2019. http://www.theses.fr/2019ISAT0053.
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Les nouveaux outils logiciels permettent de simuler le comportement dynamique transitoire des systèmes mécaniques multi-corps. Pourraient-ils produire une bonne prévision des efforts qui prennent place dans les systèmes de voilures tournantes des hélicoptères? Les travaux développés dans cette thèse apportent des éléments de réponse à cette question, sachant que le contexte considéré est porteur de nombreuses difficultés : flexibilités des corps, liaisons mécaniques complexes, hyperstatismes…L’enjeu est important car le cycle de développement de ces ensembles mécaniques serait fortement réduit par une bonne estimation d’efforts dès les premières étapes de la conception d’une nouvelle architecture. Dans ce cadre, un nouveau niveau de modélisation est introduit, centré sur les systèmes dynamiques à l’étude. La présentation de l’approche multi-échelle proposée implique le recours à des modèles locaux simplifiés. L’étude s’appuie sur le système de voilure tournante de l’hélicoptère H160 actuellement en phase d’industrialisation chez Airbus Helicopters et qui comprend les pales, le rotor principal et les actionneurs de commande hydrauliques. Trois développements majeurs sont détaillés : modélisations d’un sous-ensemble plateaux cycliques, des pales et du système de voilure tournante. Le nouveau cadre de modélisation ainsi constitué permet d’estimer les interefforts au niveau des liaisons mécaniques du système, et de suivre leurs évolutions au cours du tempsNew software tools are used to simulate the transient dynamic behaviour of multi-body mechanical systems. Could they provide a good forecast of loads applied on helicopter rotary wing system? The work developed in this thesis provides some answers to this question, knowing that the context considered presents many difficulties: flexible bodies, complex mechanical links, hyperstatisms… The stakes are high because the development cycle of these mechanical assemblies would be greatly reduced by a correct estimation of loads during the first steps of the design of a new architecture. In this context, a new level of modeling is introduced, focusing on the dynamic systems studied. Since this level is part of a multi-scale approach, it is necessary to feed it with simplified models of the subassemblies that form the studied system, and this leads to so-called local studies. The presentation of this work is based on the rotary wing system of H160 helicopter, currently in industrialization phase at Airbus Helicopters, which includes the blades, the main rotor and the hydraulic control actuators. Three major developments are detailed: modelling of a swashplates sub-assembly, blades and the rotary wing system.The new modelling framework thus created allows the loads estimation at the level of the mechanical links of these systems and the monitoring of their evolution over time
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Spittka, Berndt F. (Berndt Friedrich) 1980. "Analysis of headless shear stud connections." Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/74404.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 115-117)
Highway bridges are exposed to numerous elemental and loading issues that are extremely difficult for a designer to anticipate and account for during design. The current state of practice is to design a bridge deck for a certain life span and then turn the bridge over to maintenance personnel who attempt to prolong the life of the deck through a variety of repair and rehabilitation measures. These repair measures are rarely, if ever, considered during the design process of the bridge deck. Numerous researchers have looked at making bridges, specifically decks, more repairable. The majority of these research efforts have focused on the bridge deck system as a whole. Other researchers have looked at individual elements of the bridge deck to girder connection to see if the required strength could be achieved while making the connections easier to take apart. One of the main components in the bridge deck to girder system is the steel shear stud connection, which is used to create composite action between the deck and the girder. Numerous researchers have studied this connection from a strength perspective, and the strength equations for the shear connection have been codified. Shear connections using headless studs have been researched as well, but always as a part of a larger deck to girder connection system. The headless stud has never been researched to see how it responds to a shear loading. This study looks at headless studs with varying levels of debonding along the stud shaft to analyze the impact on the load resistance that the levels of debonding would have. Granular materials for the shear transfer of load are also looked at. The results show that, as expected, the headless, debonded shear studs can carry less load than a bonded stud, but the difference in load carrying capacity is within the suggested over-estimation range of the codes that other researchers have suggested. These results suggest that the use of headless, debonded shear studs in a deck to girder connection is a feasible way to make that connection more repairable.
Funded by the U.S. Dept. of the Army.
by Berndt F. Spittka
S.M.
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Carroll, Jeffery D. "Withdrawal and combined load capacity of threaded fastener wood joints /." This resource online, 1988. http://scholar.lib.vt.edu/theses/available/etd-04122010-083654/.
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Cruz, Helena Maria Pires. "Nailed timber joints subjected to alternating load cycles." Thesis, University of Brighton, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.357016.
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Carroll, Jeffrey D. "Withdrawal and combined load capacity of threaded fastener wood joints." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/42043.
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Ni, Chun. "Behavior of nailed timber joints under reversed cyclic load." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23869.pdf.
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Leen, Sean B. "Elastic-plastic generalised load-displacement prediction for tubular joints." Thesis, University of Nottingham, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287266.
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Hong, Jiazheng. "A Semi-Analytical Load Distribution Model of Spline Joints." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1426110670.
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Modenese, Luca. "Biomechanics, musculoskeletal modelling, hip joint loads prediction, muscle force estimation." Thesis, Imperial College London, 2012. http://hdl.handle.net/10044/1/39476.
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A musculoskeletal model of the lower limb has been implemented and assessed in order to be used as a predictive tool to quantify the hip contact force (HCF) vector acting between the femoral head and the pelvic acetabulum. The model is based on a published anatomical dataset, which has been critically revised and extended. The HCFs obtained through the model have been assessed at multiple levels of detail against measurements from instrumented prostheses from a publicly available dataset. In the first instance, a direct comparison has been undertaken in order to verify predicted HCF magnitudes close to the measured and muscle recruitment consistent with electromyographic activation profiles reported in the literature. Secondly, a trend validation was performed to ensure the correct behaviour of the model when the same daily living task (level walking) was performed with different modalities. Finally, a falsification of the model was performed by challenging it to predict the exact components of the measured hip contact forces for both level walking and stair climbing. The closest achievable predictions were also calculated, together with the accuracy of a conventional use of the model not exploiting a priori knowledge of the joint contact forces. Once the assessment of the model was completed, a dataset of anthropometric, kinematic and kinetic data was collected on eight young healthy subjects performing daily living activities. As a demonstration of the potential use of the dataset, a subject specific model was generated and used to estimate HCF direction and magnitude for level walking and stair climbing, the same activities investigated during model validation. The model was further extended in order to include the upper part of the body and potentially analyze full body kinematics and kinetics. A further modified version of the model was finally developed in order to be used in finite elements analyses or more generally in applications requiring equilibrated sets of muscle and joint forces acting on a bone structure, as the highly discretized representation of the muscles makes the model particularly suitable for this kind of use. The developed model has been implemented in the open source software OpenSim and is freely available for download and use in research.
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Sahboun, Salahaddin. "V-band joint torsional load capacity." Thesis, University of Huddersfield, 2015. http://eprints.hud.ac.uk/id/eprint/28321/.
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This research thesis presents an analysis of the torsional loads on V-band clamps. In some applications, the relative rotational movement of the flanges connected by V-band clamps can result in catastrophic system failure. The ability to understand the factors impacting on torsional load capacity is therefore essential. In this research project, a theoretical model of a V-band joint subjected to torsional loads was developed. This model is used to identify those parameters that will impact on the joint’s reliability. An experimental investigation was conducted to validate a theoretical model using a newly developed test rig. The development and features of this test rig are presented in this report. This experimental investigation also allowed the impact of those parameters that are difficult to control, to be determined. A total of three V-bands were used with different diameters but nominally identical cross sections were studied. In the research results, the initial slip point between flanges and the V-band clamp was identified by experimentation within this research project. Different sizes of Vbands were used under boundary conditions and loads. From the simulation results it was determned that the friction effect on the V-band depends on the size of the V-band. For the largest size of V-band, there was moderate correlation of the experimental and theoretical results. For the smallest size, the results suggest that with band tightening, flange contact is localised, rather than being throughout the band’s entire circumference. The research demonstrated the significant relevance of the band and flanges’ contact points and the coefficient of friction, especially that between the flanges, on the V-band clamp’s theoretical torsional load capacity.
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Söderberg, Johan. "A finite element method for calculating load distributions in bolted joint assemblies." Thesis, Linköpings universitet, Mekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-81739.
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Bolted joints are often the most critical parts with respect to fatigue life of structures. Therefore, it is important to analyze these components and the forces they are subjected to. A one-dimensional nite element model of a bolted joint is created and implemented as a program module in the Saab software `DIM', together with a complete graphical user interface allowing the user to generate the structure freely, and to apply both mechanical and thermal loads. Available methods for calculating fastener exibility are reviewed. The ones derived by Grumman, Huth and Barrois are implemented in the module, and can thus be used when dening a geometry representing a bolted joint assembly. Investigations have shown that it cannot be said that either method is generally better than the other. Calculated properties of interest include the fastener forces, plate bearing and bypass loads, and - for simpler geometries without thermal loads - the load distribution between rows of fasteners. The program is fully functional and yields numerically accurate results for the most commonly used joints where fasteners connect two or three plates each. It has limited functionality on geometries with fasteners connecting four or more plates and for a certain loading combination also for three plates, due to the tilting of the fasteners not being accounted for in the model for these cases. Also, there is no explicit method available for nding an accurate value for the fastener exibility for these, less common, joint structures.
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Sandahl, William, and Jesper Bragsjö. "Utdragskapacitet Sidokoppling Håldäck." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-34506.
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To achieve structural integrity in precast concrete systems, connections between elements must be capable to transfer both vertical and horizontal loads which puts high demands on single ties. Hollow-core slabs are often used to stabilize the structural system which puts high demands on the connections between the slab and the buildings stabilizing units. Because of this, the connections need to withstand high tensile and shear forces. The purpose of this report is to investigate the tensile capacity of tie-connections used between hollow-core slabs that are parallel with e.g. stabilizing walls and compare with current design methods. Current design methods suggest that tensile failure will occur in the roof and bottom of the cores which provides low design capacities. Two connections are investigated through full scale pull-out tests where the results are compared with the design methods. The results from testing the tensile capacity show that the failure module occurred as suggested. However, the tests show significantly higher capacity than proposed by the design methods. Eurocodes Design assisted by testing are applied to the test result and a new design method is proposed. Both provides design values that are approximately twice as large as the values suggested in previous design methods.
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Fernandez, Mauricio. "Effects of Temperature and Creep on the Clamp-up Load in Hybrid Metal to Composite Bolted Joints." Fogler Library, University of Maine, 2008. http://www.library.umaine.edu/theses/pdf/FernandezM2008.pdf.
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Korolija, Alexandra. "FE modeling of bolted joints in structures." Thesis, Linköpings universitet, Hållfasthetslära, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-81110.
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This paper presents the development of a finite element method for modeling fastener joints in aircraft structures. By using connector element in commercial software Abaqus, the finite element method can handle multi-bolt joints and secondary bending. The plates in the joints are modeled with shell elements or solid elements. First, a pre-study with linear elastic analyses is performed. The study is focused on the influence of using different connector element stiffness predicted by semi-empirical flexibility equations from the aircraft industry. The influence of using a surface coupling tool is also investigated, and proved to work well for solid models and not so well for shell models, according to a comparison with a benchmark model. Second, also in the pre-study, an elasto-plastic analysis and a damage analysis are performed. The elasto-plastic analysis is compared to experiment, but the damage analysis is not compared to any experiment. The damage analysis is only performed to gain more knowledge of the method of modeling finite element damage behavior. Finally, the best working FE method developed in the pre-study is used in an analysis of an I-beam with multi-bolt structure and compared to experiments to prove the abilities with the method. One global and one local model of the I-beam structure are used in the analysis, and with the advantage that force-displacement characteristic are taken from the experiment of the local model and assigned as a constitutive behavior to connector elements in the analysis of the global model.
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Timko, Paul Daniel. "Finite Element Analysis of Unbraced Structural Wood I-Joists Under Construction Loads." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/42527.
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The research summarized the experimental analysis and finite element modeling of the lateral and rotational response of unbraced wood composite I-joists to worker loads. All experimentation and modeling was conducted on simply supported I-joists varying from 11-7/8 inches to 14 inches in depth and 20 feet to 24 feet in length. I-joists were subjected to static and dynamic loads. The deflections of the top and bottom flanges, as well as the rotation, were measured or calculated at both one-half and one-quarter the span length. The overall goal of this project is to accurately model the lateral and rotational displacements caused by human load effects.
I-joists were first tested statically by subjecting each joist to a three point bending test, free from all lateral restraints. This test was necessary to prove that the performance of the joists was repeatable. Lateral and rotational stiffness of the joist were calculated at one-half and one-quarter of the span length. The static experimental tests results were statistically analyzed using an analysis of variance (ANOVA) test. The results from this analysis indicated no difference between repetitions of the same joist; however, the test did indicate that there was a significant difference between joists of the same manufacture and size. Dynamic testing was then conducted. Dynamic loads were induced by having test subjects traverse each I-joist. The resulting loads induced at the top and bottom flanges were recorded for use in the finite element model. The lateral deflections and induced loads were compared to the static weight of the test subject and analyzed with an ANOVA test. The results indicated an increase in both the induced load and resulting deflection with an increase in weight. The analysis also indicated an increase in load and deflection with a decrease in lateral and rotational joist stiffness.
The recorded load values from the dynamic test were used as inputs into a finite element model. The resulting lateral deflections of the midpoint and quarter point were generated. The rotation of the beam was calculated from the difference between the top and bottom flange. Experimental results and finite element model results were compared by calculating a running average of the error between the acquired data and the finite element model. The model was said to be valid until the average model error reached 10 percent of the maximum acquired test value. All six deflection readings were analyzed in this manner. The percent of beam at which the model no long represented the test data was determined for each data set. This point was averaged across all deflection readings of similar joists and across all data sets of the same joist type. The model predicted the 20 foot long 11-7/8 and 14 inch deep joists until 54.5 percent and 51.2 percent, respectively, of the beam completed by the test subject. However, the 24 foot long 11-7/8 inch deep joist was only accurate to 31.2 percent of the beam completed by the test subject.
Differences in peak values, and the time at which the peak values occurred were also analyzed using an ANOVA test. There was a significant difference between the peak values of the acquired test data and the deflections generated with the finite element model. However, there was no significance within the time that the peak values occurred between the model and experimental results.
A simplified pseudo dynamic analysis was conducted using a constant percentage of the test subject's static weight applied to the top and bottom flange. This approximation proved adequate for the lateral displacement and rotation of the 11-7/8 inch and 14 inch deep and 20 foot long I-joists. However, the model became un-conservative for the 11-7/8 inch deep and 24 foot I-joists.Master of Science
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Arnold, Stuart John. "Load transfer across cracks and joints in concrete slabs on grade." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/7581.
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This research has investigated the behaviour of joints and cracks under single and multiple cycles of load. This provides an increased understanding of concrete slab on grade performance, enabling more effective design and monitoring procedures. Examination of the geometry of cracks and joints within concrete slabs on grade has demonstrated that the commonly assumed parallel formation is erroneous. Measurements using embedded strain gauges, coring and surface profile levelling have uncovered that a high percentage of joints will contain larger crack widths at the surface than at the base, caused by differential shrinkage. The opening itself is relatively linear; however, the top 50mm of the slab is prone to a higher gradient of movement due to the increased drying effect towards the surface. A series of deflection tests using a Falling Weight Deflectometer and Prima dynamic plate enabled slab response under load to be evaluated. Four sites were examined in total and correlations found between: load transfer, load step, edge cantilever and crack geometry. This produced valuable information regarding the influence of load transfer and crack width on the overall slab behaviour. Foundation voiding and crack face free slip was also shown to influence deflection magnitude. A small-scale test facility was developed for the assessment of deterioration in various 'V' shaped and parallel crack widths under high cycle loading. The data demonstrated that joint/crack failure contains four distinct phases of deterioration, each of which is controlled by a different mechanism. 'V' shaped cracks produced a much greater load transfer than that of a parallel crack with the incorporation of A142 mesh and steel fibres reducing differential displacement. Load magnitude and aggregate size were also shown to have significant effects. The value of reinforcement was found to assist with serviceability requirements, keeping displacement within acceptable levels and preventing the onset of serious degradation A finite element model was developed to enable the load transfer mechanism results from the laboratory test to be used in the assessment of full slab response. Simulations of field testing produced a series of lower bounds in respect to deflections and the associated response calculations. Theoretical behaviour of a typical slab was assessed with subbase support, joint stiffness, slab thickness and the incorporation of a subbase, found to be highly influential in reducing slab deflections. The three main sections of work comprising site data collection, laboratory testing and Finite Element modelling have been used together to provide a much greater understanding of the influence of cracks and joints. This has included the deterioration of cracks over time and an examination of how this and other site-based factors affect overall slab behaviour.
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Kratochvil, Jan. "Asymptotic Analysis of the Load Transfer on Double-Lap Bolted Joints." Phd thesis, Techn. Univ., Studienbereich Mechanik, 2012. https://tuprints.ulb.tu-darmstadt.de/2997/1/Diss_Kratochvil.pdf.
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In this thesis, the complex potential method along with the method of compound asymptotic expansions is applied to the analysis of selected problems of plane elasticity related to double-lap bolted joints. The contribution to the thesis lies in the construction of several closed-form approximations of solutions to the considered problems.
After a brief introduction of the basic theoretical concepts in Chapter 2, a mathematical model of a double-lap bolted joint is presented in Chapter 3. A very simple model is chosen in order to make an analytical treatment possible. This model assumes the (generalised) state of plane stress in each of the plates and a simple sinusoidal distribution of contact pressure in the bolt-to-hole contact and leads mathematically to the first fundamental problem of the plane theory of elasticity.
In Chapter 4, a formal asymptotic solution of the first fundamental problem for an infinite plane or half-plane weakened by a finite number or an infinite symmetric array of small holes is derived. The relative hole radius plays the role of the small parameter. Three different governing partial differential equations are considered, namely the Laplace equation, the bipotential equation and a more general linear elliptic fourth-order partial differential equation with constant coefficients. An asymptotic expansion of the complex potentials is derived for each equation. It is uniformly valid in the whole domain, i.e. in the vicinity of each of the holes as well as in the far-field. The solution is summarised in form of algorithms for a computer algebra system and implemented in Mathematica. Furthermore, a fully parametrised finite element model of the considered problem has been created using the commercial FE Software Abaqus and its Python programming interface in order to verify the results in an independent way.
This general solution is in Chapter 5 applied to three types of problems. The first one is the problem of stress concentration on unloaded holes. Its purpose is to evaluate the capability of the method by means of simple examples where a sufficiently high number of terms of the asymptotic series can be generated. The second type of problems involves the compliance of an infinite row of pin-loaded holes. A closed-form approximate formula for the compliance of an infinite row of pin-loaded holes in an infinite isotropic plane and a half-plane is derived. This formula, as opposed to semi-empirical formulae commonly used in the industrial environment, correctly takes into account the contributions of the plane deformation of the plates to the overall compliance of the joint. Finally, the third type deals with the determination of the load distribution on both finite number of bolts as well as infinite rows of bolts. Closed-form approximations of the load distribution factor for these configurations are presented.
A certain problem related to the nature of the proposed solution is the convergence of the asymptotic series. As expected from the nature of the asymptotic solution, the discrepancy between the asymptotic solution and a reference numerical one is the smallest for small radii and with increasing radii, it generally increases. However, results with the presented order of approximation are sufficiently accurate in the technically relevant domain.
In the case of anisotropic material behaviour, the formulae describing the dependence on the material parameters are too complex for practical use even in the simplest situations such as stress concentration on a single hole in a half-plane. A certain simplification can be achieved by assuming strong orthotropy and performing a Taylor expansion in terms of the corresponding small parameter. It appears that such an expansion exhibits good convergence and can be therefore used also for moderately orthotropic materials. Unfortunately, it was not possible to obtain analytical results for infinite rows of holes in anisotropic plates because the proposed algorithm leads to infinite sums that cannot be be evaluated analytically.
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Blom, Arvid. "Speed dependent friction in bolt joints." Thesis, KTH, Maskinkonstruktion (Inst.), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141687.
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Denna rapport undersöker hastighetsberoende friktionsbeteende i zinkpleterade 8.8 M12x1.75 skruvförband med en klämlängd på 82 mm och ett åtdragningsmoment på 120 Nm. Totalt 84 åtdragningar genomförs med nya skruvar, brickor och muttrar för varje åtdragning med utrustning tillhandahållen av Atlas Copco. All data importeras och analyseras i Matlab. Analysen visar att inom en standard avvikelse från medelvärdet kan klämkraften variera med så mycket som 90% beroende på var inom det 10-200 rpms hastighetsspannet skruven drogs åt. Vidare framgår även att restmomentet är mycket beroende av den hastighet som skruven drogs åt vid, med ett restmoment ~5 Nm över slutmomentet för 10 rpm och ~20 Nm över slutmomentet vid 200 rpm. En ursprunglig hypotes tas fram som antar att en utförlig modell av lastfördelningen i skruvensgänga och under skruvens skalle kan användas för att förutse skruvförbandets friktionsbeteende. Denna hypotes övergavs då mätresultat och analys visar att effekten av en förbättrad lastfördelningsmodell inte skulle märkas då spridningen i friktionen är för stor.This report examines the speed dependency of frictional behavior in zinc plated 8.8 M12x1.75 bolt joints with an 82 mm clamping length at a tightening torque of 120 Nm. A total of 84 test tightenings have been performed with new bolts, nuts and washers for each tightening. The tests are performed using equipment supplied by Atlas Copco and all data is imported and analyzed in Matlab. It is found that within one standard deviation of the mean value the clamping force can vary as much as 90% depending on where in the 10-200 rpm speed range the bolt is tightened. Furthermore it is concluded that the residual torque is also highly speed dependent, registering at ~5 Nm above the final torque at 10 rpm and ~20 Nm above at 200 rpm. An initial hypothesis was developed regarding the pressure distribution in the thread and under the bolt head in the hopes that better understanding and modeling of this aspect could help predict frictional behavior in the bolt joint. This hypothesis was abandoned after it is concluded that the impact of an improved pressure model would be much too small to be noticeable due to the already large scatter in frictional coefficients.
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Charlton, Zachary. "Innovative Design Concepts for Insulated Joints." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/35509.
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The main goal of this research is to develop new and innovative designs for insulated rail joints for improved life cycle and higher cost effectiveness. The research focuses on using electrically insulating materials that replace the epoxy used in current bonded insulated joints. Insulated joints (commonly known as â IJsâ ) are widely used on railways to electrically insulate rail segments from each other, while mechanically connecting them together. The electrical insulation is necessary for accommodating track signals. The mechanical strength is needed to ensure the rail and IJs are able to withstand the vertical, longitudinal, and lateral forces that commonly occur on track.
Insulating materials that can replace the epoxy used in bonded insulated joints are researched. The electrical insulation properties and mechanical strength of different materials are examined to determine the suitability of different materials for use in insulated joint. The most promising materials for use are determined to be fiber reinforced polymers and ceramics. Insulated joint designs are developed to accentuate the strengths of these two materials. The Insulating Metal Composite (IMC) insulated joint design that uses ceramics is determined to be the most promising of the new designs and is pursued through prototype fabrication.
This particular joint design is analyzed structurally using both closed form analysis and FEA analysis using the software package ABAQUS. Electrical analysis using PSPICE is carried out on the joint. Prototypes of several design iterations of the insulating metal composites are built and tested. A proof of concept static bending test of the insulating metal composites used to build the IMC insulated joint is performed using a Tinius Olsen compressive tester. A rolling-wheel load test is performed on a prototype IMC component installed in rail. Finally, a prototype of a complete IMC insulated joint is fabricated and installed on the FAST test track at TTCI facility in Pueblo, Colorado for field evaluation. Electrical testing using a megohmmeter is performed on a complete prototype joint.
Structural analysis shows that the components used to construct the IMC insulated joint can withstand the vertical and longitudinal loads applied to them. Electrical analysis shows that the joint can provide adequate electrical insulation and provides the required dielectric strength in the AREMA Manual for Railway Engineering. The proof of concept test shows that an IMC component can withstand 100 kips of static load without damage. The rolling-wheel load test shows that the ceramic in the IMC components can withstand a large shock load and that the rail used in the IMC insulated joints can survive repeated and shock loads. The testing of the prototype joint on the FAST track, which is ongoing at this time has shown that the new joint concept is fully capable of providing adequate electrical insulation and mechanical strength throughout the expected life of IJs.Master of Science
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Bamberg, Christopher Ryan. "Lateral Movement of Unbraced Wood Composite I-Joists Exposed to Dynamic Walking Loads." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/31977.
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The research summarized in this thesis is comprised of an experimental analysis of the mechanical behavior of a wood composite I-joist with different bracing configurations exposed dynamic walking loads. Three 16 in. deep GPI® 65 I-joists were simply supported and laid parallel to each other, while the bracing was attached to the top flange. Five different brace stiffnesses were used: zero stiffness (control), 1.2 lb/in., 8.5 lb/in., 14.0 lb/in. and infinitely stiff. Two different brace configurations were used: one-quarter of the span length (60 in.) and one third the span length (80 in.). The dynamic walking loads consisted of human test subjects attached to a safety platform walking across the I-joist at a designated pace. Experimental results for this research consisted of the I-joistâ s lateral accelerations, lateral displacements and twist. An Analysis of Covariance (ANCOVA) was used for the statistical analysis of the results and was performed for each measurement. The statistical analysis determined the effects of different bracing configurations, stiffnesses, measurement locations as well as test subjectsâ weight and occupation.
Test results and observed trends are provided for all test configurations. Lateral displacement and twist experienced the same trend throughout the experiment: as brace stiffness increased, lateral displacement and twist decreased. This correlated with basic beam theory and bracing fundamentals. It should be noted that as the stiffness increased, the effect on lateral displacement and twist response decreased.
However, the trend for lateral displacement and twist was not observed for the lateral accelerations. The 1.2 lb/in. brace stiffness had much larger lateral accelerations for the 60 in. brace configuration throughout the span and were also larger at the bracing point for the 80 in. brace configuration. This could have been due to the energy applied from the springs or a natural frequency of the I-joist system could have been reached during testing. However, the other four brace stiffnesses followed the same trend as the lateral displacements and twist.
In addition, this research demonstrates a method for the measurement of lateral buckling due to worker loads. The mitigation of lateral buckling can use appropriate bracing systems. The measurements of the change in lateral buckling behavior can be used to develop safety devices and ultimately ensure the protection of construction workers.
Master of Science
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Starikov, Roman. "Quasi-static and fatigue behaviour of composite bolted joints." Doctoral thesis, Stockholm, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3163.
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Li, Yantao. "Behaviour of moment-resisting multi-fastener joints subject to reversed cyclic load." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape2/PQDD_0035/MQ65502.pdf.
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Wilke, Fabian [Verfasser]. "Load Bearing Behaviour of Grouted Joints Subjected to Predominant Bending / Fabian Wilke." Aachen : Shaker, 2014. http://d-nb.info/1049381440/34.
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Chastain, Patrick Alan. "Effects of load proportioning on the capacity of multiple-hole composite joints." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/90922.
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This study addresses the issue of adjusting the proportion of load transmitted by each hole in a multiplehole joint so that the joint capacity is a maximum. Specifically two-hole-in-series joints are examined. The results indicate that when each hole reacts 50% of the total load, the joint capacity is not a maximum. One hole generally is understressed at joint failure. The algorithm developed to determine the load proportion at each hole which results in maximum capacity is discussed. The algorithm includes two-dimensional finite-element stress analysis and a failure criteria. The algorithm is used to study the effects of joint width, hole spacing, and hole to joint-end distance on load proportioning and capacity. To study hole size effects, two hole diameters are considered. Three laminates are considered: a quasi-isotropic laminate; a cross-ply laminate; and a 45 degree angle-ply laminate. By proportioning the load, capacity can be increased generally from 5 to 10%. In some cases a greater increase is possible.M.S.
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Boseman, Mark F. "Study of load transfer and fracture on composite-to-metal-wire joints." Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/March/09Mar%5FBoseman.pdf.
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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, March 2009.Thesis Advisor(s): Kwon, Young W. "March 2009." Description based on title screen as viewed on April 23, 2009. Author(s) subject terms: butt joint, overlap joint, modified-wire-end-shape joint, finite element method, energy release rate, virtual crack closure method, fracture toughness, ansys. Includes bibliographical references (p. 43). Also available in print.
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Rastogi, Naveen. "Load transfer in the stiffener-to-skin joints of a pressurized fuselage." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-155607/.
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Yaghin, Mohammad Ali Lotfollahi. "Joint probabilities of responses to wave induced loads on monohull floating offshore structures." Thesis, Heriot-Watt University, 1996. http://hdl.handle.net/10399/687.
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Gutierrez-Franco, Juan. "THE EFFECTS OF OBESITY ON RESULTANT KNEE JOINT LOADS FOR GAIT AND CYCLING." DigitalCommons@CalPoly, 2016. https://digitalcommons.calpoly.edu/theses/1624.
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Osteoarthritis (OA) is a degenerative disease of cartilage and bone tissue and the most common form of arthritis, accounting for US$ 10.5 billion in hospital charges in 2006. Obesity (OB) has been linked to increased risk of developing knee OA due to increased knee joint loads and varus-valgus misalignment. Walking is recommended as a weight-loss activity but it may increase risk of knee OA as OB gait increases knee loads. Cycling has been proposed as an alternative weight-loss measure, however, lack of studies comparing normal weight (NW) and OB subjects in cycling and gait hinder identification of exercises that may best prevent knee OA incidence. The objective of this work is to determine if cycling is a better weight-loss exercise than gait in OB subjects as it relates to knee OA risk reduction due to decreased knee loads. A stationary bicycle was modified to measure forces and moments at the pedals in three dimensions. A pilot experiment was performed to calculate resultant knee loads during gait and cycling for NW (n = 4) and OB (n = 4) subjects. Statistical analyses were performed to compare knee loads and knee angles, and to determine statistical significance of results (p < 0.05). Cycling knee loads were lower than gait knee loads for all subjects (p < 0.033). OB axial knee loads were higher than NW axial knee loads in gait (p = 0.004) due to the weight-bearing nature of gait. No differences were observed in cycling knee loads between NW and OB subjects, suggesting cycling returns OB knee loads and biomechanics to normal levels. The lack of significant results in cycling could be due to the small sample size used or because rider weight is supported by the seat. Limitations to this study include small sample size, soft tissue artifact, and experimental errors in marker placement. Future studies should correct these limitations and find knee joint contact force rather than knee resultant loads using v EMG-driven experiments. In conclusion, cycling loads were lower than gait loads for NW and OB subjects suggesting cycling is a better weight-loss exercise than gait in the context of reducing knee OA risk.
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Müller, Matthias. "Predicting the ultimate axial load capacity of joints formed using V-band retainers." Thesis, University of Huddersfield, 2011. http://eprints.hud.ac.uk/id/eprint/12144/.
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V-band retainers are widely used in the automotive, aircraft and aerospace industries to connect a pair of circular flanges to provide a joint with good axial strength and torsional rigidity. V-band retainers are manufactured using a cold roll forming process. Despite their wide application, once assembled to a pair of flanges little is known about the interaction between flange and band. Moreover the failure mode of V-band retainers when applying an axial load is not fully understood. In this thesis the ultimate axial load capacity of V-band retainers is predicted using finite element and theoretical models and validated using experimental testing. It was shown that the ultimate axial load capacity was strongly dependent on the joint diameter, increasing between 114mm and 235mm, and decreasing beyond that. Moreover, the peak in ultimate axial load capacity was dependent on parameters such as the axial clamping load and coefficient of friction, and its position lay between 235mm and 450mm, as predicted by the finite element models. Other geometrical parameters such as flange and band thickness showed large impacts on the ultimate axial load capacity as well. A theoretical model was developed that allowed the ultimate axial load capacity to be calculated from a single formula for larger bands and using a simple algorithm for smaller bands. This model supported the findings that, depending on the band diameter, the ultimate axial load capacity had a peak, but predicted its position at approximately 181mm. This position at 181mm was validated by the experimental data. However, when compared to the tests, the finite element and theoretical models both over-predicted the ultimate axial load capacity. Both the finite element models and practical tests showed that for small V-bands axial failure is due to a combination of section deformation and ring expansion, whereas large V-bands fail due to ring expansion only. These two distinct types of behaviour were incorporated into the theoretical model. The hardness development throughout the cold roll forming process was predicted using finite element models. This was validated by hardness measurements, for which a new technique was generated, that directly linked plastic strain and hardness values.
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Hsueh, Fu-Kan. "Load-response of GFRP cellular deck joints comprising GFRP bar-reinforced polymer concrete." Thesis, University of Bristol, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.702461.
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Fibre reinforced polymer (FRP) structures have been increasingly applied in construction, including in road bridges due to their advantages of lightweight, high specific strength and corrosion resistance. However, the brittle nature of FRPs leads to the need for ductile joints to improve the safety of FRP structures. To that end, Glass FRP rebar-reinforced Polymer Concrete (GFRP-RPC) joints between cellular GFRP deck units, combined with an adequate external energy dissipation device (that functions as a replaceable fuse), may fulfil this need for such decks. This PhD study focuses on the load responses of GFRP-RPC joints between cellular GFRP deck units by full-scale anchorage and joint tests, along with simplified methods for predicting the failure loads of the joints. From these studies it is concluded that the GFRP-RPC joints failed by moment-induced rebar-to-polymer concrete anchorage failure. The joints were of high efficiency and shear-strength, and exhibited impressive recovery ability after unloading from large deflections after failure. Further, friction between the polymer concrete confined within the cells of the GFRP decking and the GFRP rebars can contribute to energy dissipation during load cycling. Using rebar-to-polymer concrete shear bond stresses deduced from anchorage testing, it is shown that anchorage failure can be monitored by the third of three phases of behaviour observed during testing. Simplified methods for predicting shear and bending moment capacities of GFRP-RPC joints generally showed good correspondence to experimental data. Future work can focus on cumulative residual shear bond stresses and irreversible slip observed in the anchorage tests, and also on shear failure behaviours of GFRP-RPC joints. Further, a half plastic hinge (HPH) joint (GFRP-RPC joint combined with an adequate external energy dissipation device) between FRP components has been under development by the author. It is expected that "a ductile FRP structure" can be achieved via these HPH joints.
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Casas-Rodriguez, Juan P. "Damage in adhesively bonded joints : sinusoidal and impact fatigue." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/11814.
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The main aim of this research was to investigate the behaviour of adhesive joints exposed to repeated low-velocity impact i.e. impact fatigue (IF), and to compare this loading regime with standard fatigue (SF), i.e. non-impacting, constant amplitude, sinusoidal loading conditions. Two types of lap joint configuration using rubber toughened modified epoxy adhesives were used and exposed to various loading conditions in order to determine the fatigue behaviour of the joints for each load conditions. The fatigue life was investigated using bonded aluminium alloy (7075-T6) single lap joint (SLJ) specimens, where it was seen that IF is an extremely damaging load regime compared to SF. Different trends were visible in force-life plots for these two types of loading. In SF a gradual decrease in the fatigue life with increasing load was observed, whereas, in IF a significant decrease in life was seen at relatively modest levels of maximum force after relatively few cycles. Comparisons of the fatigue life show a considerably earlier failure in IF than in SF for comparable levels of force and energy. Additionally, it was demonstrated that the maximum force per cycle, loading time, stiffness and strength decreased as a result of damage generated in the sample during IF.
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Kim, Sunghwan. "Early age behavior of jointed plain concrete pavements subjected to environmental loads." [Ames, Iowa : Iowa State University], 2006.
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Benatar, Michael A. "An Experimental Investigation of the Load Distribution of Splined Joints under Gear Loading Conditions." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1460908970.
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Sander, Jason Andrew. "Mechanical-Empirical Performance of U.S. 50 Joint Sealant Test Pavement." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1176222025.
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Piyasin, Surasith. "The design of the hollow-bore clevis-pin type of load cell." Thesis, University of Sheffield, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322937.
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Vidová, Miriama. "Objekt střediska živočišné výroby." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391888.
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My diploma theisis is focused on design and assessment of structural systém of industrial building in tended for livestock farming. The design is processed in two options. Both oft hem has the same dimensions but cross sections of the supporting elements are changed. Floor plan of the first part is a rectangular shape, dimension is 29,28 m x 24,8 m. Floor plan of the second part is a rectangular shape, dimension is 161,18 m x 46,8 m. Slope of saddle roof is 18°.
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Cotter, Joshua Allan. "The Effect of Squat Load and Depth on Patellofemoral Joint Kinetics." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243606700.
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Ganji, Nagesh Lankaranu Hamid M. "Parametric study of load transfer in two-bolted single lap hybrid (bonded/bolted) shear joints." Diss., A link to full text of this thesis in SOAR, 2007. http://soar.wichita.edu/dspace/handle/10057/1133.
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Thesis (M.S.)--Wichita State University, College of Engineering, Dept. of Mechanical Engineering."May 2007." Title from PDF title page (viewed on Dec. 20, 2007). Thesis adviser: Hamid M. Lankarani. Includes bibliographic references (leaves 62-64).
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Nazirizadeh, Susan. "Estimates of load rates on the lower limb joints using smartphone accelerometers during physical activity." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/422272/.
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Although the causes and pathology of the progression of osteoarthritis are not entirely understood, an active lifestyle avoiding excessive load on the joints can control symptoms of osteoarthritis (e.g. joint pain and stiffness). The aim of this thesis was to develop, validate, and test an algorithm for estimating impact loading through the lower limbs using wearables (smartphones and smartwatches). The viscoelastic nature of articular cartilage means it is susceptible to high load rates, hence, the mean load rate magnitude was estimated from accelerometer recordings of wearables and used as a surrogate for estimating impact loading on the lower limb joints. The validity of the mean load rate magnitude was assessed against the gold standard equipment, the force plate (R2 = 0.77). Further, the mean load rate magnitude was used as a feature in the classification of everyday activities with support vector machine classifiers with an accuracy of 80%. An app was then developed which monitored mean load rate magnitude using Markov chain Monte Carlo methods for testing the reliability of monitoring over a period of seven days. The accumulated mean load rate magnitude was used to estimate the error, êsmartphone = 2.66%, for seven-day recordings. Finally, a function to score pain was added to the final version of the app, termed OAppTM. A single case study assessed the ability of OAppTM to compare osteoarthritis-related pain to mean load rate magnitude with a low positive correlation of r = 0.38. To conclude, this thesis developed, assessed the validation, and tested a load rate magnitude algorithm, which estimated load rate on the lower limb joints with the accelerometer sensors of wearables. These results form the basis for further research to develop a clinical tool for monitoring load rate and supporting patients to maintain an active lifestyle by avoiding excessive load on their lower limb joints.
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Cunningham, Ronald. "Effects of joint continuity on tapered member steel portal framed structures." Thesis, Heriot-Watt University, 1987. http://hdl.handle.net/10399/1051.
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Khoury, Issam Semaan. "Load transfer mechanism in rigid pavement." Ohio : Ohio University, 1993. http://www.ohiolink.edu/etd/view.cgi?ohiou1175710176.
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To, Albert C. (Albert Chi Fu) 1975. "Lateral load capacity of drilled shafts in jointed rock." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/40018.
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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1999.Includes bibliographical references (p. 263).
Large vertical (axial) and lateral loads often act on the heads of drilled shafts in jointed rock. In current design practice, the p-y curve method used in design of laterally loaded drilled shafts in soil is adopted in the design of such shafts in jointed rock. The p-y curve method treats the soil as a continuum. The continuum model is not applicable to jointed rock, in which the joints form blocks. A new discontinuum model was developed in this thesis to determine the lateral load capacity of drilled shafts in a jointed rock mass with two and three joint sets. It contains two parts: a kinematic and a kinetic analysis. In the kinematic analysis, the removability theorem of a convex block is expanded to analyze the removability of a block intersecting a pile and the removability of a combination of blocks. Based on these removability theorems, a method was developed to select removable combinations of blocks using easily constructed 2-dimensional figures only. In kinetics, each selected removable combination of blocks is analyzed with the limit equilibrium approach to determine the ultimate lateral load capacity. Although the analysis is similar to slope stability analysis, it is more complicated with the addition of a lateral force exerted by the pile and the vertical pile load exerted on the wedge. The analysis also considers the weight of the wedge, the shearing resistance along the joints, and the vertical pile load exerted on the wedge. Simple analytical relations were developed to solve for the ultimate lateral load capacity.
by Albert C. To.
S.M.
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Lyszczan, Peter [Verfasser], and Dietmar [Akademischer Betreuer] Göhlich. "Shear Load Transfer and Relaxation in Bolted Joints with Fractured Surfaces / Peter Lyszczan. Betreuer: Dietmar Göhlich." Berlin : Universitätsbibliothek der Technischen Universität Berlin, 2012. http://d-nb.info/1020274123/34.
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