Strip
Checking the Active box in the Strip tab allows you to display analysis results for the design strips. Each plot value represents the variation of the selected value at each design strip segment cross section (along the axis of each strip selected). Plots related to the maximum and minimum moments and shears can be displayed, enabling the envelope for a particular plot value to be displayed.
The Torsion value is the torsion about the centroid of the design strip segment, in equilibrium with the element nodal forces.
The Twist value is the component of the torsion due to the slab twisting moment (Mxy for design strips parallel to the x- or y- axes) calculated from the element stress predictions (and is not necessarily in equilibrium with the element nodal forces). The Twist value is not recommended for use in torsion design.
Absolute Twist is the sum of the absolute value of the twist along the cross section. This value differs from the "Twist" value in that it is always positive, and that in its calculation, twist values of different signs do not cancel out.
The Absolute Twist value is not used in design unless Wood-Armer torsion design is selected.
Definitions of other values can be found in Chapter 50, "Analysis Notes".
The "standard" strip context values are only available for loading and load combination layers, while the four enveloped contexts are available for loading, load combination and rule set design layers.
