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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.
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
Test results of nine stiffened panels loaded axially show that the Perry-Robertson formula accurately predicts the collapse load and the direction of collapse provided the imperfection term ©¯ is interpreted in a logical manner. A new expression for ©¯ is derived. Four other panels were tested in bending or with combined bending-axial loadings. Simple rules are also presented for the design of stiffened panels with these