Thesis

Web crippling of cold-formed plain channel steel section beams

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Awarding institution
  • University of Strathclyde
Date of award
  • 1994
Thesis identifier
  • T8283
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Abstract
  • The web crippling strength of cold-formed plain channel steel section beams was investigated theoretically and experimentally in this research program. The web crippling strength in this thesis is termed the ultimate web crippling load and this was theoretically analysed using two different design specifications and a plastic mechanism approach. The two design specifications used in this research program were BS 5950 Part 5:1987 and European Recommendations For The Design of Light Gauge Steel Members, 1987. In the plastic mechanism approach, a plastic mechanism model of web crippling failure was developed and analysed using a method of yieldline analysis. This approach has resulted in analytical expressions and these are specially used to analyse the ultimate web crippling load of the plain channel section beams subjected to combined actions of web crippling and bending. Besides the theoretical investigations, experimental investigations were also carried out for many plain channel section beam specimens of various dimensions. In the experimental investigations, test loads applied to the specimens were varied according to the loading conditions specified by AISI 1986 and they were transfered onto the specimens through various load bearing lengths. The experimental results were used to study the influence of various factors on the ultimate web crippling loads and toverify the theoretical results. The accuracy of theoretical results was statistically analysed and their deviations from the experimental results were limited within the acceptable scatter values ± 20%. Some examples of the web crippling behaviour of the specimens characterized by their experimental load-deflection curves were also presented and, especially for the specimens under combined actions of web crippling and bending, their experimental load-deflection curves were compared to the theoretical collapse curves obtained from the plastic mechanism approach. Finally, the results of the experiments and the verification of each theory used in this research program are discussed and concluded in the last three chapters of this thesis.
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DOI
EThOS ID
  • uk.bl.ethos.679592
Date Created
  • 1994
Former identifier
  • 991474413402996

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