Welding residual stresses : and the shear buckling strength of plate-web girders

Owen, Ronald. (1967). Welding residual stresses : and the shear buckling strength of plate-web girders Master's Thesis, School of Engineering, The University of Queensland.

       
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Author Owen, Ronald.
Thesis Title Welding residual stresses : and the shear buckling strength of plate-web girders
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 1967
Thesis type Master's Thesis
Total pages 235
Language eng
Subjects 09 Engineering
Formatted abstract This thesis presents the results of tests on six model plate girders to determine the effect of compressive residual stresses on the shear buckling strength of the girder webs. Three of the six girders had an artificial compressive residual stress introduced into the webs with balancing tensions in the flanges. The other three girders were free of residual stress. An idea of the magnitude and distribution of residual stresses in full size plate-web girders was obtained partly from a literature survey and partly from measurements of residual stresses in two welded girders. The first girder in which longitudinal residual stresses were measured had a 3/16" web plate 24" wide, and 6" X ½” flanges. The second had a 3/l6" web plate, 36" wide and 9" x ¾ " flanges. An analysis for residual stresses was performed for the latter girder, giving results in fair agreement with the measured residual stresses.

Results are also given for a buckling analysis of simply supported rectangular plates containing residual stresses and subject to bending and shear stresses. The small deflection theory for an ideal elastic plate was expressed in finite difference form and the analysis was performed on the digital computer.

The object of this thesis was to find a theoretical analysis which would agree with experiment for simple cases of residual stress distributions. In the event that this could be achieved, it would then be assumed that the analysis (being quite general and programmed for the computer) would apply for a more complicated residual stress distribution. For example, as introduced by welding.

The theoretical analysis did not agree with the experimental results. Indications are that the large deflection theory should be used instead of the small deflection theory partly because of the initial plate deflections which are usually present. There is also evidence that these initial deflections are increased by the welding process. The post-buckling strength of the web-plates should be examined as well.
Keyword Girders -- Testing.
Girders -- Welding.
Strains and stresses.

 
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