Steel Interchange

Shape Surface Area

Answer

Appendix A of AISC Design Guide 19 provides the surface area in ft2/ft. Assuming that you have what the table calls “Case B,” which is the entire surface area of both flanges and web, the surface area = (6.77 ft2/ft)(30 ft) = 203 ft2. The table also lists surface areas assuming that the shape is boxed-in or if the outside of one flange is not included. This publication is a free download for AISC members at www.aisc.org/epubs.

Brad Davis, Ph.D., S.E.