Continuing Education

Roof Design Using Iterative Analysis For Ponding Loads [N24]

In this session roof ponding requirements in the SJI 2015 Specifications, IBC 2015, ASCE 7-16, the International Plumbing Code (2015), FM Global and the AISC 2016 Specification are reviewed. The recently improved SJI Roof Bay Analysis Tool is also discussed. This tool assists the engineer in selecting the most economical joist bay configuration and now also determines the stability of the bay for roof ponding. The ponding analysis method implemented in the tool, in which loads are computed based on the deformed shape of the roof, are introduced and compared to traditional methods of assessment defined within the AISC Specification. Several analysis examples of roofs constructed with joists and Joist Girders are presented. The presentation also includes photographs of roof failures with discussion as to why the collapses occurred.

Intended Audience: Engineers, Architects
Track: Design & Analysis

  • Date: 4/11/2018 - 4/13/2018
  • PDH Credits: 0


James Fisher, PE, PhD; Mark Denavit, PE, PhD

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