Yield-line formulae for slabs
In this book a first attempt is made to establish simple formulae for the calculation of various types of slab that are of interest in practice. The book includes a large number of examples of the application of the yield-line theory for slabs, as presented in my book "Yield-line theory", which will be referred to throughout this book by the abbreviation "YLT".
The same notation and sign convention are used as in YLT. As regards the term "restraint", the following remarks should be noted. It is necessary to differentiate between geometric and static restraint.
With geometric restraint, movements of the slab are completely prevented at the restraint and the restraining moment is statically indeterminate. With static restraint, the restraining moment is given and is equal to the ultimate moment in the section of restraint. The movement of the section of restraint is geometrically indeterminate. The older term, partial restraint, corresponds more closely to static restraint, although it does not cover this completely, as partial restraint can only give restraining moments that are smaller than those corresponding to geometric restraint, whereas static restraint may well result in greater restraining moments. In the following, restraint should be taken to mean static restraint, unless otherwise stated.
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