After an introductory Chapter on slabs, the broad design provisions of the
British and American Codes of Practice are set out A historical review of elastic and
ultimate load methods of slab design together with examples is then followed by a
discussion on loads, load factors, material factors, patterns of loading and the division
of slabs into various strips.
Three extensive chapters with examples on the use of the Codes of Practice
examine and discuss the provisions and behaviour of slabs on rigid and semi-rigid
supports and flat slabs supported by columns. The results of an extensive elastic finite
element investigation are compared with the various methods available for the design of
the three types of slabs under both serviceability and ultimate conditions.
In Chapter 5 on rigidly supported slabs it is concluded that for the British Code
the ultimate load recommendations are satisfactory but that in general the moment
coefficients recommended require considerable negative moment redistribution and in
some cases by considering the finite element results the steel must almost be yielding
under the serviceability loads. With one exception the American code is better from the
serviceability condition aspect but the simply supported slab bending moment
coefficients would cause premature failure.
Chapter 6 on slabs on semi-rigidly supported slabs indicates the British code is
sadly deficient on design information for this type of slab while the American code
gives proposals which give answers which are broadly in agreement with the finite
Chapter 7 on flat slabs shows that both the British and American codes are
reasonably satisfactory both from the serviceability and ultimate conditions.
The final Chapter highlights areas which need attention and make some
suggestions for further study.
A Master's Thesis. Submitted in partial fulfilment of the requirements for the award of Master of Philosophy of Loughborough University.