Ponding Analysis With the New AISC/SJI Design Guide

The ponding provisions that were in Appendix 2 of the AISC Specification are not in the 2022 edition, and ASCE 7 now requires ponding head be included in the rain load. Old approaches to ponding analysis are no longer permitted. AISC and SJI have a new Design Guide to help engineers navigate the new requirements. This session will review requirements for rain load and ponding in various specifications and codes, introduce a method of design for ponding that meets the requirements, and run through design examples to show how it all fits together.

Learning Objectives:

• Learn the main roof ponding requirements from ASCE/SEI 7-22.
• Describe the limitations of the method of ponding analysis given in Appendix 2 of the 2016 AISC Specification.
• Understand how to investigate the stability of simple roof systems for ponding using the SJI Roof Bay Analysis Tool.
• Identify the main factors influencing the ponding stability of open web steel joist roofs.