Monday, April 16th, 2018

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Volume effects

It has been long known and proven that large structural members do not have the same strength per unit of size as smaller members. The theory behind this is weak link analysis which suggests that the larger the area the more potential area will contain a strength limiting defect.

Testing has proven this theory and industry quidelines have been set up that take a reduction in allowable stresses for large members. Span charts and load tables will already incorporate this factor.

For designers using large members they should always consider volume effects in their structural calculations. AITC publishes a document detailing proper use of this factor.