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Dissertations / Theses on the topic 'Portal Frame'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Moor, Constantin. "Three dimensional analysis of steel portal frame buildings." Thesis, Queensland University of Technology, 1997. https://eprints.qut.edu.au/36010/1/36010_Moor_1997.pdf.

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The true strength and deflection behaviour of industrial and commercial steel portal frame buildings is understood better if the effects of stiffness of end frames and profiled steel claddings are included. The conventional designs ignore these effects and are very much based on an idealised twodimensional frame behaviour. This thesis describes an investigation into the three-dimensional behaviour of steel portal frame buildings using computer modelling and full scale tests. The full scale tests of a 12 m x 12 m clad and unclad steel portal frame building with true pinned and standard

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2

Subaaharan, S. S. "Improved modelling and design of portal frame building systems." Thesis, Queensland University of Technology, 1998. https://eprints.qut.edu.au/36068/7/Subaaharan%20Thesis.pdf.

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The traditional approach for the design of steel portal frame building systems is based on the idealised two-dimensional behaviour of a bare internal frame in the system. This approach totally ignores the integral action of other structural components in the system. In order to design the portal frame building system based on its 'true' threedimensional behaviour, it is necessary that other structural components such as steel roof and wall cladding systems and end frames (or their effects) are included in the analysis. In the UK and USA, this has been achieved using the principles of str

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3

Al, Mamun Abdullah. "Investigating the Performance of Wood Portal Frames as Alternative Bracing Systems in Light-Frame Wood Buildings." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23142.

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Light-frame shearwall assemblies have been successfully used to resist gravity and lateral loads, such as earthquake and wind, for many decades. However, there is a need for maintaining the structural integrity of such buildings even when large openings in walls are introduced. Wood portal frame systems have been identified as a potential alternative to meet some aspects of this construction demand. The overarching goal of the research is to develop wood portal frame bracing systems, which can be used as an alternative or in combination with light-frame wood shearwalls. This is done through in

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4

Wong, Shao Young. "The structural response of industrial portal frame structures in fire." Thesis, University of Sheffield, 2001. http://etheses.whiterose.ac.uk/3005/.

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A number of recent fires in single-storey warehouses have drawn attention to a current lack of understanding about the structural response of industrial portal frame structures to elevated temperatures. This research project has investigated the subject by conducting fire tests on a scaled model and by computer modelling using the non-linear finite element program VULCAN. This program has been developed in-house by the University of Sheffield and is capable of modelling the behaviour of three-dimensional steel and composite frames at elevated temperatures. It has been validated throughout its

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5

Heldt, Tim J. "The use of hollow flange beams in portal frame buildings." Thesis, Queensland University of Technology, 1996.

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6

Kylén, Joakim. "2D-model of a portal frame railway bridge for dynamic analysis." Thesis, KTH, Bro- och stålbyggnad, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37025.

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7

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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8

Ülker-Kaustell, Mahir. "Some aspects of the dynamic soil-structure interaction of a portal frame bridge." Licentiate thesis, KTH, Civil and Architectural Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-11358.

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<p>For certain bridge types, the influence of soil-structure interaction (SSI) may have an important contribution to the stiffness and damping of the structural system. From a design point of view, this influence may be both conservative and non-conservative and therefore, an increased knowledge within this field could lead to better design assumptions. In terms of maintenance, assessment and upgrading of existing structures, an increased knowledge of the phenomena and parameters which govern the soil-structure interaction, may lead to more realistic models and thereby, to more precise informa

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9

Ahmed, Alia Osman Mohamed. "Design for improved seismic performance of a light gauge steel portal frame structure." Thesis, University of Strathclyde, 2013. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25734.

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This research work develops a design methodology for improving the earthquake resistance of slender portal frame structures and evaluates the performance of this kind of light gauge steel portal frame structures in earthquake prone areas through the study of designed building using a finite element approach. The design of the building was carried out for a site in Sudan for peak ground acceleration 0.23g according to the Eurocodes 3 and 8 for ductility class "Low". Two analytical techniques (i.e. Static displacement pushover and dynamic time-history), were employed to assess the behaviour of t

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10

Llorens, García Andrea. "Traffic induced vibrations on a portal frame railway bridge : Comparison of theory and measurements." Thesis, KTH, Bro- och stålbyggnad, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-36351.

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The effect of different vertical support stiffness of a frame railway bridge is investigated in this study. Due to the dynamic loads of the high speed trains that run over the railway bridges, the response of these structures is far from the static effects. The frame bridge chosen for this study is the Rössjö bridge, located on the Bothnia Line, the first high speed railway built in Sweden. Using a theoretical model of this bridge, the eigenfrequencies of the structure and the vertical accelerations of the deck are evaluated. Not only different vertical support stiffness, but also different tr

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11

Arvidsson, Therese, and Jiajia Li. "Dynamic analysis of a portal frame railway bridge using frequency dependent soil structure interaction." Thesis, KTH, Bro- och stålbyggnad, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-40485.

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With the development of high-speed railroads the dynamic behaviour of railroad bridges is increasingly important to explore. Deeper knowledge about the influence of different factors and what should be included in a model is essential if the designer shall be able to make reliable estimates of responses in existing and new structures. One factor is the soil-structure interaction (SSI), describing how the foundation of the bridge and the soil properties affect the behavior of the bridge under dynamic loading. In this thesis, the influence of including SSI in a model of a portal frame railway br

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12

Louw, Graeme Scott. "Lateral support of axially loaded columns in portal frame structures provided by sheeting rails." Thesis, Stellenbosch : Stellenbosch University, 2008. http://hdl.handle.net/10019.1/1585.

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Thesis (MScEng (Civil Engineering))--Stellenbosch University, 2008.<br>Doubly symmetric I-section columns are often utilised in portal frame construction. The sheeting (or cladding) is carried by sheeting rails connected to the outer flange of these columns. Although it is common practice to include the sheeting rails in the longitudinal bracing system, by connecting the sheeting rail to the cross-bracing, designers must be wary because the connection between column and sheeting rail will not prevent twisting of the columns cross-section. It has been shown ([11], [12], [17]), that by incl

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13

Sandqvist, Nils, and Marko Milicevic. "Soil-Structure Interaction Analysis of Portal Frame Railway Bridges : Numerical Analysis of Two Case Study Bridges." Thesis, KTH, Bro- och stålbyggnad, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-289329.

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This thesis concerns dynamic Soil-Structure Interaction (SSI) analysis of portal framerailway bridges. Dynamic problems are common for bridges used for high speedrailway traffic. The passing trains induce harmonic loads on the bridges causingvibration amplitudes that may cause damage to the bridge structures and userdiscomfort.Previous studies have shown that the effects of SSI are substantial for short spanportal frame bridges. The damping ratio of the system is greatly increased due to theenergy dissipation properties of the surrounding soil causing significant changes in thedynamic response

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14

Ikzer, Rita. "Dynamic Soil-Structure Interaction of a Portal Frame Railway Bridge - Numerical Analysis on a Case Study Bridge." Thesis, KTH, Bro- och stålbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231877.

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In the field of structural dynamics, a broader knowledge about relevant phenomena that affect the dynamic behavior of railway bridges is vital for structural engineers and design code administrators. The knowledge might benefit in an increased understanding of e.g. the resonance phenomena, and in improvements of the existing design codes. A phenomenon that has received more attention in recent times is the so called soil-structure interaction (SSI), as it may significantly contribute to the stiffness and damping of a structural system. Previous investigations have suggested that the influence

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15

Dagdelen, Turgay, and Shaho Ruhani. "Finite Element Analysis of the Dynamic Effect of Soil-Structure Interaction of Portal Frame Bridges - A Parametric Study." Thesis, KTH, Bro- och stålbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231119.

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In Sweden, the railway sector currently faces the challenge of developing its first high-speed railway line, in response to the need to provide faster domestic and international transport alternatives. High-speed train passages on railway bridges can cause resonance in the bridge superstructure, which induce high accelerations that should not exceed the limits stipulated in the current design code. The most common bridge type adopted in Sweden is the portal frame bridge, an integral abutment bridge confined by surrounding soil. The soil possesses inherent material damping and radiation damping

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16

Rocha, Rodrigo Tumolin [UNESP]. "On saturation phenomenon in energy harvesting based on nonlinear piezoelectric materials coupled to a portal frame foundation with ideal and non-ideal excitations." Universidade Estadual Paulista (UNESP), 2016. http://hdl.handle.net/11449/143867.

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Submitted by Rodrigo Tumolin Rocha null (digao.rocha@feb.unesp.br) on 2016-09-09T20:48:05Z No. of bitstreams: 1 Tese_FInal.pdf: 13569204 bytes, checksum: 57c9cb53f7d15296a337d3d7544e5191 (MD5)<br>Approved for entry into archive by Juliano Benedito Ferreira (julianoferreira@reitoria.unesp.br) on 2016-09-13T13:55:19Z (GMT) No. of bitstreams: 1 tumolinrocha_r_dr_bauru.pdf: 13569204 bytes, checksum: 57c9cb53f7d15296a337d3d7544e5191 (MD5)<br>Made available in DSpace on 2016-09-13T13:55:19Z (GMT). No. of bitstreams: 1 tumolinrocha_r_dr_bauru.pdf: 13569204 bytes, checksum: 57c9cb53f7d15296a337d3d

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Rocha, Rodrigo Tumolin. "On saturation phenomenon in energy harvesting based on nonlinear piezoelectric materials coupled to a portal frame foundation with ideal and non-ideal excitations /." Bauru, 2016. http://hdl.handle.net/11449/143867.

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Orientador: José Manoel Balthazar<br>Banca: Airton Nabarrete<br>Banca: Angelo Marcelo Tusset<br>Banca: Vinicius Piccirillo<br>Banca: Atila Madureira Bueno<br>Abstract: Recently, the interest and research about energy harvesting has been increasing substantially in the technical-scientific community. With the great world demand for electrical energy, many researchers, in Brazil and in the World, have concentrated their efforts to seek new energy sources. In addition, with the technological advances is possible to use low-power consumption devices, that are, most of time, powered by a battery, w

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18

Park, Ashley Yuuki. "Semi-rigid joints to tubular columns and their use in semi-continuous frame design." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/semirigid-joints-to-tubular-columns-and-their-use-in-semicontinuous-frame-design(5214b6d8-7df6-4197-bbcd-d4d92b8330df).html.

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Traditionally, joints are assumed to be either pinned or fully rigid, but in reality, many behave between these two extremes giving them a semi-rigid classification. By acknowledging the semi-rigidity of nominal pin joints, steel frames can be designed as semi-continuous in which the beam bending moments are partially transmitted to the column members and the need for lateral bracing is eliminated, thus reducing material and construction costs. This thesis presents the results of numerical and theoretical studies of the behaviour of bolted endplate connections to Rectangular Hollow Section (RH

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19

Hernandez, Gerardo. "Investigation into the use of the Ilizarov frame for the correction of congenital talipes equinovarus (clubfoot)." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/investigation-into-the-use-of-the-ilizarov-frame-for-the-correction-of-congenital-talipes-equinovarusclubfoot(c5093e52-a065-4b9b-a5eb-8cafefca4996).html.

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Clubfoot is one of the most common pathologies of the foot affecting 1 in 1000 newborn babies according to statistics. The first treatment approach is by using conventional procedures, such as plaster and cast, and, the literature reports a range of failures causing relapse. Patients with severe or relapsed cases or patients that are treated later in life may require unconventional procedures to provide correction. In order to increase the success rate after the correction, it is necessary to: a)perform analyses to improve the current treatments and b) investigate the tissues involved in this

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20

Athanasios, Dimitriou. "Surface pre-treatment methods for improving adhesion ability in wood plymer composite for frame and furniture construction applications." Thesis, Bangor University, 2015. https://research.bangor.ac.uk/portal/en/theses/surface-pretreatment-methods-for-improving-adhesion-ability-in-wood-plymer-composite-for-frame-and-furniture-construction-applications(0e7da265-4f1a-4506-aad1-f3e84105aff1).html.

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21

Cox, Wilfred. "Nonlinear analysis of reinforced concrete portal frames." Thesis, University of East London, 2001. http://roar.uel.ac.uk/1303/.

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There are considerable difficulties in describing the properties of reinforced concrete materials and their interaction. It is therefore necessary to calibrate the mathematical model by accurate testing of laboratory specimens. It can be shown that momentcurvature relationship varies along the length of a member and at beam-column joints. This behaviour depends critically on the geometry of the joint, reinforcement details and the stress-strain characteristics of concrete and steel. Tests have been carried out on model reinforced concrete portal frames and independent specimens making up the f

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22

Zhang, Xi. "Steel Portal Frames with Locally Unstable Members." Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10452.

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The advanced analysis based design has an advantage over conventional member based design methods because it is most capable of capturing the limit state strength and stability of a real structure, taking into account system effects explicitly such as the load redistribution subsequent to first yielding. While being considered as the next generation's design method, the advanced analysis based design is still restricted to steel frames comprising only members with compact cross-sections in AS4100, partly because modelling local instability requires discretisation of the cross-section which mak

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23

Aljohani, Wael Hamad H. "Fabrication and characterisation of organic monolithic columns for the separation of small molecules using HPLC-MS : the Frame Problem revisited." Thesis, King's College London (University of London), 2017. https://kclpure.kcl.ac.uk/portal/en/theses/fabrication-and-characterisation-of-organic-monolithic-columns-for-the-separation-of-small-molecules-using-hplcms(b5ace486-6de8-4a35-ba45-6024e6bea2b7).html.

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Monolithic columns are continuous interconnected networks with large through-pore channels. This structure results in a decrease in the diffusion path and affords high permeability, which result in obtaining good separation efficiency. Ideally, the structure of monoliths should be bi-model consisting of meso-pores and macro-pores responsible for retention time and flow of mobile phase respectively. The structure also enhances the mechanical strength, and the large through-pore channels afford very low flow resistance. This combination therefore results in the ability of smaller diameter monoli

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24

Albrifkani, Sherwan. "Whole range behaviour of restrained reinforced concrete beams and frames in fire." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/whole-range-behaviour-of-restrained-reinforced-concrete-beams-and-frames-in-fire(95ff52f9-d90a-4873-8ef1-7ea301074e13).html.

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This thesis presents the results of a numerical investigation of the whole range, large deflection behaviour of axially and rotationally restrained RC beams and interactions between beams and columns in RC frame structures exposed to fire. The dynamic explicit time integration algorithm implemented in the general finite element package ABAQUS/Explicit solver was used so as to overcome various modelling challenges including temporary instability, local failure of materials, non-convergence and long simulation time. Either load factoring or mass scaling may be used to speed up the simulation pro

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25

Zamani-Farahani, Ahmad. "Analysis of TSF and Ilizarov ring fixators in orthopaedics by finite element modelling and mechanical testing." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/analysis-of-tsf-and-ilizarov-ring-fixators-in-orthopaedics-by-finite-element-modelling-and-mechanical-testing(af1567c8-47f1-4897-9cb5-5a0b1948e726).html.

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This thesis is a result of research aimed at analysis of the Taylor Spatial Frames (TSF) in Orthopaedics. The TSF is a ring external fixator, which are used to stabilise a fracture or provide stability during skeletal limb reconstruction procedures. A sound understanding of the mechanics of the fixator is essential, because mechanical stability is a key factor in bone healing. TSF is in fact an adaptation of the hexapod parallel manipulators for dynamisation of the classical ring fixators of Ilizarov type. Therefore, a general solution for Forward kinematics of parallel manipulators was provid

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26

Kermani, Abdolghaffar. "Nailed plywood haunched joints in timber portal frames." Thesis, Teesside University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236167.

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27

Lim, James B. P. "Joint effects in cold-formed steel portal frames." Thesis, University of Nottingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368970.

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28

SAVIO, ALEXANDRE ALMEIDA DEL. "COMPUTATIONAL MODELLING OF SEMI-RIGID STEEL PORTAL FRAMES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=4788@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Nos últimos tempos, vários pesquisadores têm desenvolvido formulações ou proposições geometricamente não-lineares para elementos finitos com a finalidade de se examinar o comportamento de pórticos com ligações semirígidas. Dentre estes trabalhos destaca-se o de Chan e Chui [6], que desenvolveram um elemento de barra híbrido com duas molas, com rigidez a rotação, condensadas nas suas extremidades. Implementado o elemento híbrido proposto por Chan e Chui [6] no solver FEMOOP [28] e testado, pode-se constatar que este elemento

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29

Rudman, Chantal. "Investigation into the structural behaviour of portal frames." Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/1853.

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30

Chen, Lu. "Robustness in fire of steel framed structures with realistic connections." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/robustness-in-fire-of-steel-framed-structures-with-realistic-connections(fcf4d94b-56f4-42bc-b20a-e2e497d4c14a).html.

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Joints are the most critical elements in a steel framed structure. In most design guides or codes, the joints are assumed to a have higher fire resistance than the connected structural members because of the lower temperatures in the joints. However, in severe fire conditions, a connected beam's temperature may be higher than its limiting temperature and the beam may develop catenary action when the beam’s axial shortening from large deflections becomes greater than the beam’s thermal expansion. This beam catenary action force could fracture the joints, increasing the risk of progressive colla

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31

Garzeri, Flavio José. "Dinâmica não linear de um pórtico plano sob carregamento não ideal: análise numérica e experimental." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/3/3144/tde-28032017-080049/.

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Nesta tese, apresenta-se a análise numérica e experimental do comportamento dinâmico não linear de um pórtico excitado por uma fonte não ideal - um motor elétrico de corrente contínua desbalanceado - como exemplo dessa classe de problemas. Elabora-se um modelo matemático com quatro graus de liberdade: dois relacionados com o deslocamento horizontal e vertical do ponto de apoio da máquina e dois com os parâmetros de funcionamento do motor elétrico. Adota-se a formulação Lagrangeana para gerar as equações de movimento contendo termos não lineares até ordem cúbica. A solução numérica é obtida atr

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32

Song, Yuanyuan. "Analysis of industrial steel portal frames under fire conditions." Thesis, University of Sheffield, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.500178.

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33

Elvidge, M. "The plastic analysis of pitched roof steel portal frames." Thesis, University of Bradford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.374916.

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Cullen, Gavin William James. "Performance of stabilised top-hat sections in portal frames." Thesis, Queen's University Belfast, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.359060.

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Blum, Hannah Beth. "Long-Span Cold-Formed Steel Double Channel Portal Frames." Thesis, The University of Sydney, 2017. http://hdl.handle.net/2123/16290.

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A comprehensive study on long-span cold-formed steel portal frames composed of back-to-back channel sections is presented. The aim of the study is to determine appropriate design guidelines in order for engineers to safely and efficiently build larger frames. The system analyzed herein is a haunched portal frame with a knee brace connected between the column and rafter. The objectives of the research were achieved through an extensive experimental study as well as numerical investigations. A comprehensive experimental program was completed to determine the strength and behavior of the frames.

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Nguyen, Hoai Cuong. "Strength and Behaviour of Cold-Rolled Aluminium Portal Frames." Thesis, The University of Sydney, 2021. https://hdl.handle.net/2123/25465.

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This doctoral thesis presents a comprehensive study on cold-rolled aluminium portal frames composed of back-to-back lipped channel sections. The research included an extensive experimental program on full-scale portal frames and components, a numerical simulation part on finite element modelling, and finally a proposal development of the design for the cold-rolled aluminium frame systems. The primary aim is to explore the structural behaviour and ultimate strength through experiments and numerical analyses, leading to the development of proposed provisions for the design of cold-rolled alumini

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Sawan, Hassan Tayseer. "NONLINEAR STABILITY OF PORTAL FRAMES WITH ELASTIC END RESTRAINTS." Thesis, The University of Arizona, 1985. http://hdl.handle.net/10150/275410.

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Chaloupka, Petr. "Lávka mezi budovami." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225486.

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This master's thesis deals with the designing of the appropriate supporting steel structure footbridge for pedestrians. The footbridge is used to connect two separate buildings (buildings D and Z at the Faculty of Civil Engineering Brno University of Technology). Four variants have been designed about solutions supporting steel structure. The final variant was prepared in detail and was carried out static assessment of the individual elements and selected details. The main supporting structure of this variant are two trusses. Diagonals of these trusses are designed linkage system of Macalloy 4

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Rinchen. "Long-span cold-formed steel single C-section portal frames." Thesis, The University of Sydney, 2018. http://hdl.handle.net/2123/18882.

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This thesis presents a comprehensive study of long-span cold-formed steel single C-section portal frames. The study includes the formulation of a nonlinear beam finite element for thin-walled sections, a series of full-scale frame tests and component tests, finite element modelling and advanced analysis followed by the formulation of design guidelines. The study was aimed at exploring the structural behaviour through experiment and numerical analysis towards developing provisions for the design of cold-formed steel portal frames using Advanced Analysis. A nonlinear thin-walled beam element for

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40

Freitas, Rafael Rodrigues de. "Estudo de uma estrutura em pórtico para utilização em um veículo agrícola autônomo." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/18/18145/tde-19012011-131359/.

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Avanços nas pesquisas em Veículos Agrícolas Autônomos (VAA\'s) e de Robôs Agrícolas Móveis (RAM\'s) têm sido conquistados nos últimos anos. Entretanto, um número limitado de trabalhos foca o desenvolvimento das estruturas destes veículos. O presente trabalho apresenta uma revisão de materiais encontrados na literatura e no mercado. Estudou-se modelagem cinemática de veículos autônomos que possuem configurações de suas estruturas projetadas para ter mobilidade melhorada. Estudaram-se estruturas mecânicas de máquinas que atuam em vários estádios de desenvolvimento de lavouras típicas brasileiras

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Issa, Honar Khoshavi. "Design optimisation of steel portal frames using modified distributed genetic algorithms." Thesis, Nottingham Trent University, 2010. http://irep.ntu.ac.uk/id/eprint/143/.

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Distributed genetic algorithms have been modified in this study to improve their quality, performance, and convergence to the optimum solution for structural steel frames. This was achieved by introducing some novelties of the main algorithm of distributed genetic algorithms and applying them in structural optimisation. Among these are the creation of new mutation schemes, adding a crossover scheme, definition of a penalty function, properties of twins, and definition of the reproduction scheme. Many optimisation problems have been designed to minimise the weight of a steel structure and are w

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42

Phan, Thanh Duoc. "Design optimisation of steel portal frames using real-coded niching genetic algorithm." Thesis, Queen's University Belfast, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.602785.

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This thesis is concerned with the design optimization of single-storey steel portal frame buildings. In the UK, such buildings account for 90% of all single-storey buildings and 50% of all constructional steelwork used. Two different types of steel portal frames are considered: conventional hot-rolled steel portal frames, which can achieve spans of up to 50 m, and cold-formed steel frames, which while less popular in the UK, may be more efficient for spans around 12 m. A real-coded niching genetic algorithm is used for the purposes of the design optimization. By adopting a niching strategy, th

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BURGOS, RODRIGO BIRD. "EVALUATION OF CRITICAL LOADS AND INITIAL POST-BUCKLING BEHAVIOR OF PORTAL FRAMES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=6714@1.

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CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Nesta dissertação estuda-se a flambagem e o comportamento pós-crítico inicial de pórticos planos através da formulação de elementos finitos com graus de liberdade adicionais para posterior implementação no programa de análise FTOOL. Realizaram-se análises linearizadas para a determinação das cargas críticas clássicas e modos de flambagem de colunas com diferentes condições de contorno. Em um segundo momento, realizaram-se testes numéricos no sentido de prever a estabilidade do caminho pós-crítico (sensibilidade a imperfe

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Johnston, Ross Patrick David. "Behaviour of cold-formed steel portal frames at ambient and elevated temperatures." Thesis, Queen's University Belfast, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.679247.

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This thesis is concerned with the design development of cold-formed steel portal frames at both ambient and elevated temperatures. A full-scale site test was carried out to determine the behaviour in fire, of a portal frame structure comprised entirely from cold-formed steel. Laboratory component tests were used to investigate joint behaviour at ambient temperature. Numerical modelling was used to extend the investigations without the need for further physical testing. Good agreement between the experimental tests and non-linear finite element (NLFEA) models was obtained. The finite element mo

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Rahman, Mahbubur. "A computational study of the behaviour of hot-rolled portal frames in fire." Thesis, University of Strathclyde, 2012. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=17817.

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Albertyn, Heindrich Louw. "The effect of moment-rotation joint behaviour on the displacements of portal frames." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18046.

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Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Higher grade steels are being rolled in South Africa by suppliers and results in structural members having an increased axial and bending moment capacity due to an increased yield stress. Structural elements used in designs are stronger and therefore lighter sections with sufficient axial and bending moment capacity are used. Displacements of structural elements are calculated using the stiffness and Young’s modulus of a profile. These values are not affected by the increased yield stress in higher steel grades and theref

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Vaheeshan, Jeganathan. "Transformer fault-recovery inrush currents in MMC-HVDC systems and mitigation strategies." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/transformer-faultrecovery-inrush-currents-in-mmchvdc-systems-and-mitigation-strategies(05f7a9ad-5967-47aa-b72c-e55ad1d33eb7).html.

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The UK Government has set an ambitious target to achieve 15% of final energy consumption from renewable sources by 2020. High Voltage Direct Current (HVDC) technology is an attractive solution for integrating offshore wind power farms farther from the coast. In the near future, more windfarms are likely to be connected to the UK grid using HVDC links. With the onset of this fairly new technology, new challenges are inevitable. This research is undertaken to help assist with these challenges by looking at possibilities of problems with respect to faster AC/DC interaction modes, especially, on t

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Junid, S. M. B. S. "Lateral-torsional buckling of haunched members in portal frames : an assessment of BS 5950 (part 1)." Thesis, University of Salford, 1992. http://usir.salford.ac.uk/14791/.

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The research described in this thesis, relates mainly to the current method of design of steel portal frame structures. The study is divided into two major parts, first being the full-scale test on a 24 metre span frame and the second deals with the problems of lateral-torsional buckling in the haunch region of the frame. Detailed accounts of the full-scale testing on the 24 metre span frame and the experimental results are given. Supplementary tests on beams cut out from the tested frame in order to establish the strain-hardening factor are also presented. A literature survey on the published

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Campos, Felipe dos Reis. "Controvérsia, política e risco: enquadrando os transgênicos nos portais Estadão Digital e Folha de S. Paulo." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/100/100136/tde-02032018-165034/.

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Frames são dispositivos cognitivos que organizam os sentidos da vida cotidiana. Enquadrar um risco ambiental é fazer mais saliente algumas de suas possibilidades, promovendo uma ou outra interpretação. A dissertação examina como a pauta dos transgênicos foi enquadrada pelos portais Estadão Digital <estadao.com.br> e Folha de S. Paulo <folha.uol.com.br> no período de 1998 a 2015. Para tanto, mediante a análise dos elementos textuais dos artigos (metáforas, escolhas de palavras e argumentos), 1.396 notícias foram classificadas em um dos seguintes frames de notícia: progresso, prospecto econômico

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Wrzesien, Andrzej M. "Effect of stressed skin action on the behaviour of cold-formed steel portal frames with non-linear flexible joints and top-hat purlins." Thesis, University of Strathclyde, 2016. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27491.

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