Wood-Armer Torsion Design
This new torsion design option allows the designer to use the "Wood-Armer" approach to handle twisting moments in slabs.
To provide this torsion design options, a new cross section analysis quantity, Absolute Twist, is calculated.
You can plot Absolute Twist, as shown in the figure, "Plotting Results" in Chapter 30.
When you choose the Wood-Armer torsion design, every set of design forces is converted into two sets of design forces, identical to the original except with the design moments changed to:
Md = M + AT, and
Md = M - AT
where AT = absolute twist
The Wood-Armer method (as originally developed by Wood and Armer) was intended to be applied at every point in the slab; RAM Concept ’s implementation is an extrapolation of the method for use in cross sections.
The Wood-Armer method is NOT applicable to beams, and is not recommended for strips containing beams.
References