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The Structural Engineer, Volume 53, Issue 3, 1975
A plastic method of analysis is applied to determine the collapse load for double layered flat reticular grids. Two grid types are considered, namely orthogonal and diagonal systems. The plastic analysis is performed by rotational considerations as conventionally applied to concrete slabs and from individual member deformations. The collapse load is also determined from a generalized computer displacement analysis that permits member yield and where necessary incorporates post buckling behaviour of individual members. The collapse load factors obtained from the different analyses compare favourably. J.F. Dickie and D.J. Dunn
The interest in improving fire escape facilities continues unabated and tends to centre on the helter-skelter solution. We may have treated this somewhat light-heartedly in the January issue: not because we found it risible, but because it is pleasant to think that a concept normally associated with children's pleasure may solve a horrifying hazard. Verulam
When specimens of wood with seemingly similar characteristics are tested, the strength results usually show high variability. This is attributed to two major sources: (a) Primary sources or the material factors. (b) Secondary sources or the human factors. Daniel N. Nwokoye