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It is possible to enter an oblique angle between 0 and 90 degrees to model a beam or joist rotated with respect to the load, and Sizer checks the x-axis (strong axis) and y-axis ( weak axis) strengths separately using the component of the load in these directions.
Oblique purlins are secondary framing members used in curved or pitched roofs that are subjected to two-way bending moments. Two-way bending is created by the action of the tangential and normal components of the vertical load.
Oblique purlins are designed for two-way bending when the roof sheathing cannot effectively transfer tangential loads to the member ends.
Oblique loading is not available for CLT panels or I-joists.