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Behaviour of axially loaded thin walled steel column with partially closed cross section
2003 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The recent improvements in the manufacturing technologies allow the fabrication of cold formed profiles with various complex geometries but usually their cross sections are open. Thin walled steel columns with open cross section show an intrinsic relatively low torsional resistance. The solution presented in this diploma work considers the addition of a thin plate to an open cross-section polygonal column. The connection was established by self-tapping screws placed at regular distances (600mm) along the column length, thus creating partially closed cross-section. The aim is to evaluate the efficiency of this solution and to analyse and compare the behaviour of partially closed and open cross section for axially loaded columns. Six laboratory experiments were undertaken within the project and two of them with axially loaded columns. The analytical study included the determination of section sectorial properties and the solution of the buckling problem: an influence of the local buckling on the buckling resistance was investigated using a procedure proposed by Rasmussen. Numerical analysis was performed using Finite Strip Method and Finite Element Method, and programs CUFSM and ABAQUS were used respectively. A good agreement between non-linear FEM and experiments were found both in terms of the resistance and stiffness, as well as in the matched failure mode. The ultimate limit load was determined using Eurocode 3 (Part 1-3) and the Direct Strength Method. The results were compared with those from tests and FEA. Results indicated that the partially closed cross-section column becomes efficient at rapidly increasing rates starting at the shorter column length. These lengths are at the onset where the resistance starts to be governed by the global buckling, rather than by material yielding. The diploma work was financially supported by Plannja AB, LuleƄ who is the producer of the studied column and Division of Steel Structures, Dep. of Civil and Mining Engineering, LTU.

Place, publisher, year, edition, pages
Keyword [en]
Technology, thin walled column, open cross section, closed cross, section, FEM, FSM, Eurocode 3, design, light weight steel, structure
Keyword [sv]
URN: urn:nbn:se:ltu:diva-57894ISRN: LTU-EX--03/263--SELocal ID: e84934c3-df38-419a-b03b-df8fd34b569bOAI: diva2:1031282
Subject / course
Student thesis, at least 30 credits
Educational program
Civil Engineering, master's level
Validerat; 20101217 (root)Available from: 2016-10-04 Created: 2016-10-04Bibliographically approved

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