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Title: The effects of residual stresses on the column behaviour of hot finished structural steel hollow sections
Author: Gardner, Michael John
ISNI:       0000 0001 3490 7071
Awarding Body: Council for National Academic Awards
Current Institution: Kingston University
Date of Award: 1984
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The following work describes the measurement of longitudinal residual stresses in hot finished structural steel hollow sections. All samples were supplied by the Tubes Division of British Steel Corporation (B.S.C.)and include circular and rectangular profiles manufactured by all of the methods employed by B.S.C. A total of sixty-eight profiles were examined. The technique used to determine the longitudinal stress state was the slicing method with strain release measured by mechanical extensometers. A new experimental method has been developed for the rectangular sections, where access to the inside corner area was restricted. The effect of these measured residual stress values, or idealisations based on them, on the behaviour of axially loaded pin ended columns is then examined by the development of inelastic column buckling computer programs. Various iterative solution routines are compared and a new accelerated relaxation procedure is developed. The relative effects of material and geometric imperfections on column behaviour are examined and the results obtained compared with existing and proposed column buckling design methods. One of the analysis programs is extended to cater for the application of primary bending moments at the ends of the columns and results obtained compared with existing design equations for beam-columns and modifications are suggested. The column buckling behaviour of hot finished hollow steel sections is also compared to geometrically similar profiles manufactured by cold forming or by welding. The phenomenon of local buckling of sections with relatively thin walls is also theoretically examined by utilising a non-linear finite element program. The effects of various parameters on local buckling are examined, including corner geometry, stiffening effect of stockier adjacent faces, initial geometric imperfections and residual stresses. Existing design rules for local buckling are described and comparisons made.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available
Keywords: Structural engineering