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Showing 1 to 19 of 19 for “"Purlins"”.
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Strength evaluation of strut-purlins
Diaphragm braced strut-purlins are commonly used in the roof systems of metal buildings. However, the design problem of combined uplift and axial loads on these members is not adequately addressed in the 1989 AISI specification. The objective of this thesis is to provide experimental evidence that …
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Sensitivity of Steel Purlins to Changes in Application of Wind Loads
… the effects of wind tunnel test loads applied to purlins in low rise steel buildings compared to those determined with currently recognized wind loading provisions. The National Institute of Standards and Technology (NIST) database of low-rise building wind tunnel test data, which was collected at …
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Investigation of Single Span Z-Section Purlins Supporting Standing Seam Roof Systems Considering Distortional Buckling
… the governing buckling strength for cold-formed purlins supporting a standing seam metal roof system is the 1996 AISI Specification for the Design of Cold-Formed Steel Structural Members, which contains provisions for local and lateral buckling. Previous research has determined that the AISI …
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Base test method for gravity loaded standing seam roof systems
… test must be conducted for each combination of purlins, deck panels, and clips that a manufacturer uses. The objective of this thesis is to investigate the possibility of eliminating the size of purlins, the orientation of purlins, length of span, and the presence or absence of insulation from a …
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Effect of stressed skin action on the behaviour of cold-formed steel portal frames with non-linear flexible joints and top-hat purlins
… yet recognized by design codes such as top-hat purlins, sheeting profiles fixed in the crest, profile thickness less than 0.5mm and composite panels were investigated in the test programme. 3) The difference in the structural behaviour of the bare and clad portal frames. A series of six …
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Cold-Formed Steel Behavior: Elastic Buckling Simplified Methods for Structural Members with Edge-Stiffened Holes and Purlin Distortional Buckling Strength Under Gravity Loading
… determining capacity, in most loading conditions purlins are subjected to a downward uniform loading that provides additional resistance to distortional buckling in the top flange beyond the resistance of the steel roofing panel. This research describes an experimental study to explore and …
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Stability analysis of light gauge steel members using the finite element method and the generalized beam theory
… light gauge steel members, namely rack columns, purlins and decks, have been analyzed using both FEM and GBT. The comparison of results from the numerical analyses and comprehensive tests agrees well. The author has risen to the challenge of complicated buckling problems and a pseudo-plastic …
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Investigation of Inflection Points as Brace Points in Multi-Span Purlin Roof Systems
… Seven tests were conducted using "C" and "Z" purlins attached to standing seam and through fastened panels. These tests were subjected to uniform gravity loading by means of a vacuum chamber. The experimental results were compared with analytical predictions based on the 1996 AISI …
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Development of Prediction Methods for the Lateral Anchorage Requirements in Metal Building Roof Systems
Metal building roof systems with C- or Z-section purlins require restraint to resist lateral forces developed within the roof system under gravity loads. The currently available procedures for predicting these forces have been shown to be inaccurate for sloped roofs and difficult to apply to roof …
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Modeling and stability investigation of a Glulam dome
… straight beam element for the second model. Purlins consist of truss elements. Flexible joints are modeled by adding connector elements to the ends of each beam. A bracing of truss element is applied to simulate the contribution of the decking. The dome is analyzed for two load conditions. …
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Bovedas Encamonadas: Origen, Evolucion, Geometria y Construccion entre los Siglos XVII y XVIII en el Virreinato de Perú
… of the vaults, and were stabilized laterally by purlins. Above the arches and purlins placed planks, wooden strips or just cane. In most cases ended with a mud plaster insulating the extrados and a decorative gypsum plaster on the intrados. Precisely these vaults are the subject of this thesis, …
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Direct Strength Method for the Flexural Design of Through-Fastened Metal Building Roof and Wall Systems under Wind Uplift or Suction
… Method (DSM) prediction approach for simple span purlins and girts with one flange through-fastened under uplift or suction loading. This prediction method is also applicable for the case when rigid board insulation is placed between the metal panel and through-fastened flange. The prediction …
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Estimation of Required Restraint Forces in Z-Purlin Supported, Sloped Roofs Under Gravity Loads
… in restraint force with the number of restrained purlins. An adjustment factor varies the predicted restraint force depending on the shear stiffness of the roof panel. The proposed procedure applies to five bracing configurations: support, third-point, midspan, quarter point, and third-point plus …
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Experimental Determination of Required Lateral Restraint Forces for Z-Purlin Supported, Sloped Metal Roof Systems
… span and multiple span metal roof systems. Z-purlins were used extensively with through-fastened and standing seam roof panel. Two, four, and six purlin lines were used for the single span tests while only four purlin lines were used for the multiple span tests. Restraint forces were measured …
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Geometrically nonlinear finite element analysis of a glulam timber dome
… to model the components of a dome (beams, purlins, connections, and tension ring), the specification of boundary conditions, the specification of material properties, the determination of a sufficiently accurate mesh, the determination of design loads and the specification of load …
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Further Study of the Gravity Loading Base Test Method
Presently, the industry accepted method for determining the positive moment strength of gravity loaded standing seam metal roof systems is the "Base Test Method". The Base Test Method provides a means for determining the positive moment strength of a multiple span, multiple purlin line standing …
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Lateral Restraint Brace Forces in Quarter Point and Third Point Plus Support Braced Z-Purlin Supported Roof Systems Subject to Gravity Load
The objective of this study was to develop design equations that predict lateral restraint forces in two commonly used Z-purlin supported roof systems. These are quarter point bracing and third point plus support bracing. To that end, a stiffness model used in the past has been reintroduced. This …
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Statická analýza konstrukce pro zpracování odpadu
Diplomová práce se zabývá statickou analýzou konstrukce halového typu pro zpracování odpadu. V práci nalezneme návrh a statické posouzení hlavních nosných prvků konstrukce. Jedná se o dvoulodní kombinovanou skeletovou stavbu. Střešní systém je tvořený ocelovou příhradovou konstrukcí.
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Pavilon botanické zahrady v Brně
Předmětem diplomové práce je návrh a posouzení nosné konstrukce botanického pavilonu v Brně. Konstrukce má eliptický půdorys o rozměrech 34 x 20 m, výška 9 m. Nosnou konstrukci tvoří 16 zakřivených nosných žeber, které jsou v horní části zapřené o eliptický ocelový prstenec. Mezi žebry jsou vloženy …