Benterkia, Zoubir (1991) End-plate connections and analysis of semi-rigid steel frames. PhD thesis, University of Warwick.

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Abstract

The thesis examines the behaviour of end-plate connections and the related topic of
analysis of unbraced semi-rigid steel plane frames with criteria for their design.
The static moment-rotation behaviour is investigated for connections consisting of
bolted flexible end-plates, flush and extended end-plates, between I-section members,
where the beams frame into the flanges of the columns. Attention is focussed on
moment-rotation characteristics as this is the most important influence on the
response of either individual members or complete frames. The non-linear nature of
these characteristics is identified and methods of representing moment-rotation curves
for subsequent use in analytical procedures are presented. A data base for such
types of connection is created.
An established computer program for second-order frame analysis has been extended
to frames with semi-rigid connections. Successive estimates are made of the secant
stiffness of these connections to represent their effect on frame behaviour. The
analysis program has been used to study the effects of semi-rigid joints on frame
behaviour.
Studies have been carried out to extend the Merchant-Rankine formula for the
assessment of the ultimate load of frames with semi-rigid joints over the application
range of which was until now restricted to frames with rigid joints.
A parameter entitled 'degree of flexibility' is introduced as a measure of the effect
of semi-rigid joints on the stiffness of the frame. Within the limits of the study, it
is demonstrated that the second-order effects will not be significant if the semi-rigid
elastic critical load exceeds ten times the design load, and the degree of flexibility
is less than 50%. This last requirement was satisfied by extended end-plate
beam-to-column connections. It has also been found that, under combined loading,
the serviceability limit on sway is likely to control design, rather than ultimate
strength.
Based on experimental and theoretical studies, it is recommended that the BS5950
simplified method should permit 20% end-restraint, which would improve significantly
the attractiveness of the method.

Item Type:	Thesis or Dissertation (PhD)
Subjects:	T Technology > TA Engineering (General). Civil engineering (General)
Library of Congress Subject Headings (LCSH):	Steel, Structural, Building, Iron and steel -- Joints, Structural frames
Official Date:	October 1991
Dates:	Date Event October 1991 Submitted
Institution:	University of Warwick
Theses Department:	School of Engineering
Thesis Type:	PhD
Publication Status:	Unpublished
Supervisor(s)/Advisor:	Anderson, D.
Extent:	[15], 976 leaves
Language:	eng
URI:	http://wrap.warwick.ac.uk/id/eprint/4248

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