Data on the Cone Roof and Material Data tab defines the positioning the girder rings, according to the procedures outlined in the text by Brownell & Young. This includes positioning the girder rings according to the maximum allowed rafter lengths. If alternate positioning is needed, then the design can be forced in a certain direction by specifying data on the Girder Rings tab. For more information, see Preferred Column Type.
The location of each girder ring, and the number of girders that are in each ring are specified in the grid. This value is optional.