Tesis sobre el tema "Buckling experiments"
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Liu, Bing 1975. "FE analysis of plastic buckling of plates with initial imperfections and simulation of experiments". Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=100251.
Texto completoThis thesis presents finite element analyses of plastic buckling and postbuckling behaviour of columns and plates, taking into account the presence of initial out-of-plane imperfections. The FE programs constructed by the author for this purpose are used to analyze the imperfection growth of such columns and plates under axial loading and simply supported edge conditions. The material behaviour is modeled according to both the incremental and the deformation theories of strain-hardening plasticity. The programs combine both the geometric and material nonlinearities to trace the load-deflection behaviours of these structures in prebuckling (up to the maximum load) as well as postbuckling ranges. The results of the analyses for plates show the extreme sensitivity of the incremental theory, and the relative insensitivity of the deformation theory, to the initial imperfections.
The programs are used to simulate the plastic buckling experiments on Aluminum tubes, taking into account their measured imperfections. The imperfection growth analyses demonstrate that the maximum load predictions of the incremental theory are quite close to those recorded in the experiments.
Soroori, Rad Behrooz H. "Experiments on Cold-Formed Steel Beams with Holes". Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/42698.
Texto completoMaster of Science
Haidar, Mohamed. "Modelling of failure mechanisms for corrugated board". Thesis, KTH, Hållfasthetslära (Inst.), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-176010.
Texto completoBarbarella, Elena. "Towards the localization and characterization of defects based on the Modified error in Constitutive Relation : focus on the buckling test and comparison with other type of experiments". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN066/document.
Texto completoComposite materials are nowadays extending their operational field to industrial applications other than aeronautics. New potential markets, such as automotive, imply the need to comply with different constraints; reduced cost and production time become more binding, taking the lead over the complete absence of defects. The drawback to fast automatized procedure is the higher defectiveness of the components produced, a deeper control of the part is therefore needed. Non-destructive techniques are expensive both in terms of cost and time and therefore the main question we tried to answer in this thesis is: is it possible to detect and estimate the effect of defects without resorting to the complex and time-consuming NDT techniques? An acceptable answer may potentially lead to a lower precision but should guarantee sufficient quantitative information for these applications. The thesis aims at exploring possibilities to use classical mechanical test combined with Digital Image correlation and inverse procedure to localize and characterized possible (large) defects. Buckling tests have been chosen at first due their supposed sensitivity to defects. Among the possible inverse technique, we have chosen to extend the so-called Modified Error in Constitutive Relation to the case of buckling because, in the case of vibration tests performed with several frequencies, the MCRE proved to have very good localization properties. The dedicated formulation of the MCRE for linearized buckling requires a post-processing of the non-linear experimental results. The Southwell plot is here employed to reconstruct the eigenvalue, the critical load, of the equivalent eigenvalue problem (i.e. the solution of the problem with material defect and no geometrical ones) and the Stereo Digital Image Correlation (StereoDIC) is exploited to reconstruct the deformed shape of the specimen during the test, used as mode. The interests and limits of the methodology are discussed notably through the comparison of numerical results using the MCRE in case of traction, flexion or vibration tests. It is shown that the linearized buckling based MCRE technique proves well for pseudo-experimental measurements at least for moderate geometrical imperfections. In addition first experiments have been performed; the defects are characterized from real experimental specimens, both for a nominally perfect specimen and for a defective one, where a zone of fibre waviness is induced. Stereo Digital Image Correlation (StereoDIC) is exploited to reconstruct the deformed shape of the specimen during the test, this shape being used as an approximation of the buckling mode. While on the first one no defects are detected, on the flawed specimen the localized area is in reasonable agreement with the area affected by fibre undulations
Li, Hong. "Experimental micromechanics of composite buckling strength". Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/11719.
Texto completoSchleyer, Graham Klaus. "Buckling of tank roofs : a buckling analysis and experimental investigation of storage tank domed roofs". Thesis, University of Strathclyde, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362804.
Texto completoEryasar, Mehmet Emrah. "Experimental And Numerical Investigation Of Buckling Restrained Braces". Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/12610364/index.pdf.
Texto completoRastgar, Agah Mobin. "Material Characterization of Aortic Tissue for Traumatic Injury and Buckling". Diss., Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/324268.
Texto completoPh.D.
While traumatic aortic injury (TAI) and rupture (TAR) continue to be a major cause of morbidity and mortality in motor vehicle accidents, its underlying mechanisms are still not well understood. Different mechanisms such as increase in intraluminal pressure, relative movement of aorta with respect to mediastinal structures, direct impact to bony structures have been proposed as contributing factors to TAI/TAR. At the tissue level, TAI is assumed to be the result of a complex state of supra-physiological, high rate, and multi-axial loading. A major step to gain insight into the mechanisms of TAI is a characterization of the aortic tissue mechanical and failure properties under loading conditions that resemble traumatic events. While the mechanical behavior of arteries in physiological conditions have been investigated by many researchers, this dissertation was motivated by the scarcity of reported data on supra-physiological and high rate loading conditions of aorta. Material properties of the porcine aortic tissue were characterized and a Fung-type constitutive model was developed based on ex-vivo inflation-extension of aortic segments with intraluminal pressures covering a range from physiological to supra-physiological (70 kPa). The convexity of the material constitutive model was preserved to ensure numerical stability. The increase in ë_è from physiological pressure (13 kPa) to 70 kPa was 13% at the outer wall and 22% at the inner wall while in this pressure range, the longitudinal stretch ratio ë_z increased 20%. A significant nonlinearity in the material behavior was observed as in the same pressure range, the circumferential and longitudinal Cauchy stresses at the inner wall were increased 16 and 18 times respectively. The effect of strain-rate on the mechanical behavior and failure properties of the tissue was characterized using uniaxial extension experiments in circumferential and longitudinal directions at nominal strain rates of 0.3, 3, 30 and 400 s-1. Two distinct states of failure initiation (FI) and ultimate tensile strength (UTS) were identified at both directions. Explicit direct relationships were derived between FI and UTS stresses and strain rate. On the other hand, FI and UTS strains were rate independent and therefore strain was proposed as the main mechanism of failure. On average, engineering strain at FI was 0.85±0.03 for circumferential direction and 0.58±0.02 for longitudinal direction. The engineering strain at UTS was not different between the two directions and reached 0.89±0.03 on average. Tissue pre-failure linear moduli showed an average of 60% increase over the range of strain rates. Using the developed material model, mechanical stability of aorta was studied by varying the loading parameters for two boundary conditions, namely pinned-pinned boundary condition (PPBC) and clamped-clamped boundary condition (CCBC). The critical pressure for CCBC was three times higher than PPBC. It was shown that the relatively free segment of aorta at the isthmus region may become unstable before reaching the peak intraluminal pressures that occur during a trauma. The mechanical instability mechanism was proposed as a contributing factor to TAI, where elevations in tissue stresses and strains due to buckling may increase the risk of injury.
Temple University--Theses
Markiz, Nizar. "Experimental Investigation of Lateral Torsional Buckling of Gerber Frames". Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/20051.
Texto completoBerrada, Kamal. "An experimental investigation of the plastic buckling of aluminum plates /". Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=63160.
Texto completoMisseroni, Diego. "Experimental models of Elastic Structures: Tensile Buckling and Eshelby-like Forces". Doctoral thesis, Università degli studi di Trento, 2013. https://hdl.handle.net/11572/367912.
Texto completoChattopadhyay, Arka Prabha. "Elastic buckling behavior of plate and tubular structures". Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/8702.
Texto completoDepartment of Mechanical and Nuclear Engineering
Kevin B. Lease
Xiao J. Xin
The study of buckling behavior of tubular and cellular structures has been an intriguing area of research in the field of solid mechanics. Unlike the global Euler buckling of slender structures under compressive loads, tubular and cellular structures deform with their walls buckling as individual supported plates. The aspect ratio and the dimensional characteristics of the tube define the buckling behavior of any tube structure. In this thesis, a thorough study on the buckling of polygon tubular structures with different cross sections is discussed. In the first study, the theoretical buckling formulation of a square tube using the energy method is reviewed from existing solutions in literature. The elastic critical load of a square tube derived from the theoretical solution is then compared with results of finite element elastic buckling simulations. The formation of lobes along the height of the walls at different aspect ratios of the tube is investigated and compared to theory. Also, the buckling behavior of multi-wall structures is studied and the relationship between these structures and a rectangular simply supported plate is established. A brief study on the buckling behavior of rhombic tubes is also performed. The results of the simulation match closely with the theoretical predictions. The study is then extended to quadrilateral tubes with cross-sections in the shape of square, rectangle, rhombus and parallelogram. The theory of buckling of these tubes is explicitly defined using classical plate mechanics based on the previous works presented in literature. Also, the possibility of global Euler buckling in the tubular structures after a certain critical height is discussed. The prediction from the theory is validated using extensive finite element elastic buckling simulations and experimental tests on square and rhombic tube specimens. The results of the simulations and experiments are observed to be consistent with the theory. Using the formulation of plate buckling under different boundary conditions, the buckling behavior of triangular tubes is also determined. A theoretical formulation for calculating the critical load of triangular tubes is derived. The theoretical critical loads for a range of aspect ratios are compared with corresponding finite element simulation results. The comparisons reveal high degree of similarity of the theoretical predictions with the simulations.
Lo, Patrick Kar-Leung. "Comparison of theory and experiment for flexural-torsional buckling of laminated composite columns". Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50051.
Texto completoMaster of Science
incomplete_metadata
Lane, Andrew. "An experimental investigation of buckling mode interaction in PERP wide-flange columns". Thesis, University of Warwick, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269543.
Texto completoAlrsai, Mahmoud S. "Experimental and Numerical Study on Propagation Buckling in Pipe-in-Pipe Systems". Thesis, Griffith University, 2020. http://hdl.handle.net/10072/395531.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Eng & Built Env
Science, Environment, Engineering and Technology
Full Text
Saliés, Jacques Braile. "Experimental study and mathematical modeling of helical buckling of tubulars in inclined wellbores /". Access abstract and link to full text, 1994. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9522965.
Texto completoLiu, Liu. "Durability of Polymer Composite Materials". Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/14002.
Texto completoLänsman, S. (Satu). "Evaluation of bioabsorbable poly-L/D-lactide implant for scleral buckling:an experimental study". Doctoral thesis, University of Oulu, 2009. http://urn.fi/urn:isbn:9789514260742.
Texto completoRedmond, Nicholas A. "Experimental and Analytical Investigation of the Shear Strength of Unstiffened Tapered Steel Members". Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/36067.
Texto completoThe web elementâ s stress distribution in this region of relatively complicated geometry is unknown. For this reason, web stiffening plates are commonly used to brace the slender web elements against elastic shear buckling. The design and proper installation of these relatively small elements, while proven to be effective, is also costly. Because it is desirable to remove the stiffeners, the shear behavior of unstiffened tapered members near the moment connection was the primary focus of this study. Four knee area specimens were tested to failure under simulated gravity load conditions.
The specimens were analyzed according to the AISC shear provisions for prismatic members. The appropriateness of a modified shear force, which accounts for the influence of inclined flanges, and the role of initial web imperfections were examined as well. Finally an analysis method which most consistently produces conservative results is proposed.
Master of Science
Abraham, Jeevan George. "A deflection, buckling and stress investigation into telescopic cantilever beams". Thesis, Brunel University, 2012. http://bura.brunel.ac.uk/handle/2438/7380.
Texto completoCampos, Eduardo Felipe de. "Análise numérica e experimental de flambagem em cilindros de paredes finas". Universidade Estadual Paulista (UNESP), 2017. http://hdl.handle.net/11449/152471.
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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Estruturas de paredes finas são muito utilizadas na engenharia moderna devido sua boa relação entre peso e resistência. Sua aplicação vai desde obras civis, como cúpulas em edifícios e pontes, até estruturas aeronáuticas e equipamentos industriais. Uma geometria que é muito comum de ser encontrada nas estruturas de paredes finas são os cilindros, como pode ser observado no corpo dos aviões, tubulações e vasos de pressão. Submetidas a esforços compressivos, essas estruturas ficam suscetíveis ao fenômeno de instabilidade ou flambagem, podendo entrar em colapso repentinamente, mesmo antes de apresentar altas tensões. Assim, compreender o comportamento da instabilidade se torna crucial em um projeto de estruturas de paredes finas. Um dos fatores que influenciam no comportamento da instabilidade é a imperfeição geométrica da estrutura, e qualquer processo de fabricação possui erros associados ao processo. Para iniciar o estudo foi necessário medir os defeitos devido ao processo de fabricação do cilindro. Duas alternativas para realizar as medidas foram propostas, a primeira utilizando LVDTs, que medem a variação do raio do cilindro ao longo de toda sua extensão, e a segunda o fotoprocessamento. Ambos os métodos nos deram uma nuvem de pontos que foram processadas para obter a estrutura 3D CAD, possibilitando sua análise pelo método de elementos finitos e obtenção das respectivas cargas de flambagem numéricas. Além do método numérico foi realizado um ensaio experimental visando validar a análise numérica. O cilindro foi fechado com duas tampas e montado em uma bancada experimental, instrumentado com LVDTs, manômetro e por fim, uma bomba de vácuo foi ligada a uma das tampas. A bomba criou vácuo dentro do cilindro até o mesmo sofrer colapso. As cargas de flambagem numéricas foram superiores a encontrada experimentalmente em 14,48% a geometria foto, 11,72% da geometria LVDT e 39,98% a do cilindro referência. Os resultados mostram que as imperfeições geométricas são de grande relevância na resistência a instabilidade de uma estrutura, e também que grandes imperfeições geométricas tendem a ser o local onde ocorrem as ondas de flambagem. Em relação ao método de medição por fotoprocessamento os resultados mostram que é interessante estudar a técnica para aplicações na área de instabilidade.
Thin-walled structures are widely used in modern engineering because of their good weight-to-strength ratio. Its application ranges from civil works, such as domes in buildings and bridges, to aeronautical structures and industrial equipment. One geometry that is very common to be found in thin-walled structures is the cylinder, as can be seen in the body of airplanes, pipes and pressure vessels. Under compressive stresses, these structures are susceptible to the buckling phenomenon, which can suddenly collapse, even before presenting high stresses. Therefore, understanding the behavior of instability becomes crucial in designing thin-walled structures. One of the factors influencing the behavior of instability is the geometric imperfection of the structure, and any manufacturing process has errors associated with the process. To begin the study it was necessary to measure the defects due to the cylinder manufacturing process. Two alternatives to carry out the measurements were proposed, the first using LVDTs, which measure the variation of the cylinder radius along its length, and the second the photoprocessing. Both methods gave us a point cloud that were processed to obtain the 3D CAD structure, allowing its analysis by the finite element method and obtaining the respective numerical buckling loads. In addition to the numerical method, an experimental test was carried out to validate the numerical analysis. The cylinder was closed with two flat heads and mounted on an experimental bench, instrumented with LVDTs, manometer and finally, a vacuum pump was attached to one of the flat heads. The pump has created a vacuum inside the cylinder until it collapses. Numerical buckling loads were greater than that found experimentally at 14.48 % photo geometry, 11.72 % LVDT geometry and 39.98 % a reference cylinder. The results show that the geometric imperfections are of great relevance in the resistance to buckling of a structure, and also that great geometric imperfections tend to be the place where the buckling waves occur. Regarding the method of measurement by photoprocessing the results show that it is interesting to study the technique for applications in the area of instability.
CAPES: 1544963
Nuttayasakul, Nuthaporn. "Experimental and Analytical Studies of the Behavior of Cold-Formed Steel Roof Truss Elements". Diss., Virginia Tech, 2005. http://hdl.handle.net/10919/29765.
Texto completoPh. D.
Matsuyama, Yukihiro, Ryu Sasaoka, Hideyuki Azegami, Shunji Murachi, Junzoh Kitoh, Yoshito Ishida, Noriaki Kawakami y Mitsunori Makino. "Investigation of Buckling Phenomenon Induced by Growth of Vertebral Bodies Using a Mechanical Spine Model". 日本機械学会, 2003. http://hdl.handle.net/2237/7283.
Texto completoLacarbonara, Walter. "A Theoretical and Experimental investigation of Nonlinear Vibrations of Buckled Beams". Thesis, Virginia Tech, 1997. http://hdl.handle.net/10919/36721.
Texto completoMaster of Science
笹岡, 竜., Ryu SASAOKA, 秀幸 畔上, Hideyuki AZEGAMI, 紀明 川上 y Noriaki KAWAKAMI. "脊柱力学模型による特発性側彎症の成因解明". 日本機械学会, 2003. http://hdl.handle.net/2237/12189.
Texto completoBock, Montero Marina. "Web crippling and local buckling response of stainless steel sections". Doctoral thesis, Universitat Politècnica de Catalunya, 2015. http://hdl.handle.net/10803/285582.
Texto completoEsta tesis estudia la respuesta estructural de elementos de acero inoxidable sometidos a fuerzas transversales i normales que desencadenan los fenómenos de inestabilidad llamados web crippling y local buckling, respectivamente. Actualmente, la parte de Eurocódigo que contempla los aceros inoxidables, el EN 1993-1-4 (2006) carece de ecuaciones de diseño para web crippling y la aplicabilidad de algunas de sus especificaciones necesita ser validada especialmente para los aceros inoxidables ferríticos. La primera parte de esta tesis se focaliza en el desarrollo de ecuaciones de diseño para el tratamiento del web crippling en secciones de acero inoxidable que actualmente se diseñan siguiendo las especificaciones dadas en EN 1993-1-3 (2006) para acero al carbono conformado en frío. Dos métodos de diseño para los aceros inoxidables austeníticos y ferríticos: una ecuación empírica en línea con la actual dada en EN 1993-1-3 (2006); y un método de diseño semi-empírico basado en curvas de resistencia que permite entender mejor el fenómeno y muestra una mejora importante de las predicciones a web crippling. Para la segunda parte de la tesis, se ha estudiado la aplicabilidad de las actuales especificaciones para el diseño a local buckling dadas en EN 1993-1-4 (2006) a los aceros inoxidables ferríticos focalizándose en los límites de esbeltez y las ecuaciones de ancho eficaz. Los resultados mostraron que EN 1993-1-4 (2006) puede ser aplicado a los aceros inoxidables ferríticos, aunque el código es bastante conservador en comparación con otros métodos de diseño. Finalmente, se propuso una modificación de la ecuación del ancho eficaz que incorpora la interacción entre los elementos de la misma sección y que permite, además de mejorar las predicciones de la resistencia seccional, llevar el método del ancho eficaz hasta el mismo nivel que otros métodos de diseño pero ensalzando el uso de los conceptos actualmente considerados en Eurocódigo
Egorova, Natalia Vadimovna. "Experimental Study of Ring-Shaped Steel Plate Shear Walls". Thesis, Virginia Tech, 2013. http://hdl.handle.net/10919/52633.
Texto completoMaster of Science
Rabelo, Marcos Alves. "Estudo experimental do comportamento estrutural de barras curvas". Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3152/tde-13102009-151346/.
Texto completoThis dissertation deals with an experimental study on the structural behavior of bars supported on a helical cylindrical surface and subject to compressive loads. A special experimental apparatus was designed and built for this purpose. The design, as well as the adjustment of such an apparatus is described in details. The device allows one adjusting the bars by using a system consisting of a series of bearings that can be positioned to give freedom to the structure in two different directions: radial (normal to the cylindrical surface) and lateral (tangential or bi-normal). The compressive load is applied in the tangential direction of the helix. Bars with circular and rectangular cross sections, with various buckling lengths and different helix angles, were tested. Preliminary studies with straight bars, have allowed to evaluate the boundary conditions offered by the apparatus. In these cases, it was possible to induce the phenomenon of buckling, obtaining, consistently, the values of critical loads provided by the theory of Euler and to evaluate the boundary conditions provided by the apparatus. The use of a high-speed camera allowed to observe the phenomenon of instability. The structural behavior of curved bars of circular and rectangular sections was also studied. Both, the test free length as the helix angle were varied. The study enabled us to get a huge amount of experimental data about the behavior of helical bars, subjected such loading and boundary conditions. However, the phenomenon of instability could not be induced, for any condition tested. This fact could collaborate for further inferences about the study of the birdcaging instability at flexible pipes.
Pokharel, Narayan. "Behaviour and design of sandwich panels subject to local buckling and flexural wrinkling effects". Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/15890/1/Narayan_Pokharel_Thesis.pdf.
Texto completoPokharel, Narayan. "Behaviour and Design of Sandwich Panels Subject to Local Buckling and Flexural Wrinkling Effects". Queensland University of Technology, 2003. http://eprints.qut.edu.au/15890/.
Texto completoPerea, Tiziano. "Analytical and experimental study on slender concrete-filled steel tube columns and beam-columns". Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37303.
Texto completoPURGATO, RAFAEL T. "Medida do buckling e da probabilidade de fuga de nêutrons do núcleo do reator IPEN/MB-01". reponame:Repositório Institucional do IPEN, 2014. http://repositorio.ipen.br:8080/xmlui/handle/123456789/23276.
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Dissertação (Mestrado em Tecnologia Nuclear)
IPEN/D
Instituto de Pesquisas Energeticas e Nucleares - IPEN-CNEN/SP
Stephens, Max Taylor. "Numerical and Experimental Analysis of Composite Sandwich Links for the LCF System". PDXScholar, 2011. https://pdxscholar.library.pdx.edu/open_access_etds/579.
Texto completoJavaroni, Carlos Eduardo. "Perfis de aço conformados a frio submetidos à flexão: análise teórico-experimental". Universidade de São Paulo, 1999. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-11122017-112750/.
Texto completoNowadays, the cold-formed steel members have intense application as structural elements in constructions and, in consequence, they are subjected to several types of loads. This work presents the general aspects of the study of cold-formed steel members subjected to flexion used as beams and, also, as purlins. Sections of type U, type C and type Z are analysed. The tests in beams were carried out under three different conditions of loads, with two distinct spans, in total of sixty four tests. For the purlins connected to roof system, the tests were in a \"suction box\", developed especially for this project. The purlins were connected to the roof system by the flange by using self-drilling screws, being carried out fifteen tests. The results of those tests are compared with the theoretical results, design specification provisions and results of some approximated procedures.
Pešek, Ondřej. "Stabilitní problémy prutů z vrstveného konstrukčního skla". Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390277.
Texto completoKoen, Damien Joseph. "Structural Capacity of Light Gauge Steel Storage Rack Uprights". Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3880.
Texto completoKoen, Damien Joseph. "Structural Capacity of Light Gauge Steel Storage Rack Uprights". University of Sydney, 2008. http://hdl.handle.net/2123/3880.
Texto completoThis report investigates the down-aisle buckling load capacity of steel storage rack uprights. The effects of discrete torsional restraints provided by the frame bracing in the cross-aisle direction is considered in this report. Since current theoretical methods used to predict the buckling capacity of rack uprights appear to be over-conservative and complex, this research may provide engineers an alternative method of design using detailed finite element analysis. In this study, the results from experimental testing of upright frames with K-bracing are compared to finite element predictions of displacements and maximum axial loads. The finite element analysis is then used to determine the buckling loads on braced and un-braced uprights of various lengths. The upright capacities can then be compared with standard design methods which generally do not accurately take into account the torsional resistance that the cross-aisle frame bracing provides to the upright. The information contained in this report would be beneficial to engineers or manufacturers who are involved in the design of rack uprights or other discretely braced complex light gauge steel members subject to axial loads.
Siahaan, Ropalin. "Structural behaviour and design of rivet fastened rectangular hollow flange channel beams". Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/106913/1/Ropalin_Siahaan_Thesis.pdf.
Texto completoBlum, Hannah Beth. "Long-Span Cold-Formed Steel Double Channel Portal Frames". Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16290.
Texto completoSilva, Julio Cesar Martins da. "Análise teórica-experimental de perfis de aço formados a frio devido à instabilidade por distorção na flexão". Universidade de São Paulo, 2004. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-03062016-135325/.
Texto completoThis work present a study theoretical-experimental about the distortional buckling of cold-formed steel members under bending. The distortional buckling is common for members with edge-stiffened sections and manufactured with steel of high strength. The theorical part present the analitic and numerical methods for stability analysis by distortional buckling. The experimental part included the study of cold-formed with sections channel altering flange width and thickness by proof in flexural members. Included too the numerical analysis by Direct Strength Method in Finite Strip Method on members with the same configurations of experimental investigation. Based on the experimental measurements, numerical analysis and in the theorical analysis of work, verified the procedures adopted in brazilian code NBR14762/2001 and compared with others distortional curve proposed for to design of cold-formed members under bending. Verified that the distortional buckling may control the design being the critical mode for the ultimate limit state.
Mentes, Yavuz. "Analytical and experimental assessment of steel truss bridge gusset plate connections". Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42767.
Texto completoALMEIDA, Ariovaldo Fernandes de. "Análise experimental de vigas constituídas de perfis formados a frio com emendas soldadas submetidas à flexão simples". Universidade Federal de Goiás, 2009. http://repositorio.bc.ufg.br/tede/handle/tde/649.
Texto completoThe cold-formed steel sheets have been sufficiently used when it is thought of manufacturing a metallic structure with reduced weight. Its use until some time ago in construction was limited to the secondary structures, but, with considerable growth in research involving this type of material together with development of technical standards, made its use a good solution for certain types of light structures. The present work presents considerations on cold-formed steel sheets, the patened steel, processes of welding and the result of experimental tests with beams with composed section of two profiles U constituted with cold-formed steel sheets, manufactured with two types of patened steel produced in Brazil. In some of these beams, welded sections with coated electrode had been used and were made the comparison with the reference beam, where it was possible to study the influence of the process of welding in the ultimate resistance and the ductility of the beam.
Os perfis metálicos formados a frio tem sido bastante usados quando se pensa em fabricar uma estrutura metálica com peso próprio reduzido. O seu uso até a algum tempo atrás na construção civil estava limitado apenas a estruturas secundárias, mas, com o crescimento considerável de pesquisas envolvendo este tipo de material associadas ao desenvolvimento de normas técnicas, fez com que o seu uso apresentasse uma boa solução para determinados tipos de estruturas leves. O presente trabalho apresenta considerações sobre perfis formados a frio, aços patináveis, processos de soldagem e o resultado de ensaios experimentais de vigas bi-apoiadas constituídas de perfis formados a frio compostas pela junção de dois perfis U enrijecidos, fabricadas com dois tipos de aço patináveis produzidos no Brasil, comparando-se os resultados. Em algumas destas vigas foram feitas emendas soldadas com eletrodo revestido e foi feita a comparação com vigas de referência, sem emenda soldada, possibilitando o estudo da influência do processo de soldagem na resistência à flexão e na ductilidade das vigas.
Balázs, Ivan. "Klopení tenkostěnných ocelových nosníků s vazbami vybočení z roviny ohybu". Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2017. http://www.nusl.cz/ntk/nusl-371784.
Texto completoVild, Martin. "Zesilování ocelových prutů namáhaných osovou silou pod zatížením". Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-390269.
Texto completoSauvageon, Alexis. "Instabilités locales de structures en composite acier-béton aux températures élevées". Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLN003/document.
Texto completoSteel concrete structures are a new building technology and its use starts to spread in civil engineering. these structures are made of two steel plates connected by tiebars and a concrete core. In order to provide resistance, steel and concrete must develop composite actions. In case of buckling of the steel plate, the transfer of the actions between steel and concrete is lost. This paper focus on preventing buckling failure’s mode of the structure in case of thermal loading. Two main issues are studied : defining an analytic operating for steel concrete structures regarding thermal buckling aspect including yielding coupling and getting an analytic estimation of the deflection. The results are finally confronted with numerical simulation and experimentation
Piloto, P. A. G. "Análise experimental e numérica do comportamento de estruturas metálicas sujeitas à acção do fogo". Doctoral thesis, Universidade do Porto, Faculdade de Engenharia, 2001. http://hdl.handle.net/10198/2093.
Texto completoHoráček, Martin. "Klopení tenkostěnných ocelových nosníků s otvory ve stěně". Doctoral thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-355631.
Texto completoPerret, Adrien. "Étude du comportement en post-flambement d’un panneau de fuselage composite infusé avec structures intégrées". Thesis, Toulouse, INPT, 2011. http://www.theses.fr/2011INPT0035/document.
Texto completoThese works are related to the numerical and experimental study of a composite stiffened panel, which is manufactured by a resin infusion process (Liquid Resin Infusion LRI). This manufacturing process allows structures to be integrated onto the skins of a panel being representative of a composite fuselage. Finite element models are built along with the numerical study, in order to deal with the post-buckling global behaviour of this panel. This leads to perfect a test set-up addressed during the experimental investigation. Several experimental methods are used to check the test panel and achieve the test. Material properties are also determined through material testing intended for the development of local numerical models, describing the integrated structures decohesion
Baleshan, Balachandren. "Numerical and experimental studies of cold-formed steel floor systems under standard fire conditions". Thesis, Queensland University of Technology, 2012. https://eprints.qut.edu.au/53096/1/Balachandren_Baleshan_Thesis.pdf.
Texto completoChodraui, Gustavo Monteiro de Barros. "Análise teórica e experimental de perfis de aço formados a frio submetidos à compressão". Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-31082006-152727/.
Texto completoCold-formed steel members present, in general, higher local slenderness than classical hot- rolled ones, which make them more prone to local buckling. Besides, thin-walled open sections have small torsional stiffness, and hence global torsional and flexural-torsional instability modes are many times more critical than global flexural ones. Also, distortional mode can happen in sections with lips (edge stiffener). Concerning on global buckling for members under compression, curves used in cold-formed steel design are based on hot-rolled and welded members. For example, the SSRC (Structural Stability Research Council) buckling curve, adopted by NAS (North American Specification), and Eurocode buckling curves, adopted by brazilian codes. Although some papers indicate these curves are acceptable for cold-formed steel members, others claim for a deeper analysis on their unique structural behavior, specially on residual stress, geometric imperfections and coupled buckling modes. It is presented in this thesis an experimental analysis of sections usually used in Brazil (simple and lipped channels, and also single and built-up angles). Moreover, it is developed a strategy for numerical non-linear analysis, considering the effects of global and local (also distortional) geometric imperfections and residual stress as well, in order to obtain a trustable theoretical value for the axial member stength. Results show the viability of the current buckling curves for cold-formed steel members. Finally, direct strength method (DSM) was analysed for all studied members, showing good results. Special attention to angles elastic stability, focusing on the coincidence between local-plate and global-torsional mode, which still causes confusion in design methods. Also, due to the fact angles are not pre- qualified sections for using DSM, many options on its application were studied, where it was concluded that negleting torsion in global analysis leeds to unconservative results