This article describes how to scale for notional size when inputting user-defined curves for creep and shrinkage under time-dependent material properties.
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Notional size
Notional size scaling is used to specify how the user-defined curve will be modified by the notional size of a member. Each section property (frame and shell) has a notional size that is calculated automatically or can be specified by the user. Notional size, h, is essentially the twice the ratio of volume to the surface area for the cross section of a frame or shell section property. This works out, for example, to be equal to the thickness of a shell if you ignore the edges. For a circular frame section, the notional size is the radius.
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- Creep: a = 0.67, b = 0.75, and h0 = 3.70 in = 94 mm.
- Shrinkage: a = 0, b = 1.2, and h0 = 16.7 in = 423 mm.
You can choose other vales of these parameters to best match the data available for each material.