Structural Drawings… Jun, 2005 By Mark K. Gilligan, S.E. In Articles, Structural Forum A Perspective This article is currently only available in PDF format, please click the link to the top right. About the author ⁄ Mark K. Gilligan, S.E.Mark K. Gilligan, S.E., is a Structural Engineer with Tipping Mar in Berkeley, CA. Prev Composite Beam Design Next Structural Licensure Promotes Public Safety