Design Guide 40
Rain Loads and Ponding
Smarter.Stronger.Steel.
Design Guide 40 Rain Loads and Ponding
Mark D. Denavit PE PhDJames M.Fisher PE PhD Dist.M.ASCE
by
American Institute of Steel Construction
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The information presented in this publication has been prepared following recognized principles of designand construction. While it is believed to be accurate this information should not be used or relied upon for any specific application without petent professional examination and verification of its accuracy.suitability and applicability by a licensed engineer or architect. The publication of this information is not a employees or mittee members or of any other person named herein that this information is suitablesaedoe eouuuowoooasnened oeaemaking use of the information presented in this publication assumes alliability arising from such use.
Caution must be exercised when relying upon standards and guiclelines cleveloped by other bodies andincorporated by reference herein since such material may be modified or amendled from time to time sub-for such material other than to refer to it and incorporate it by reference at the time of the initial publication of this edition.
Printed in the United States of America
Authors
Mark D. Denavit Ph.D. PE. is an associate professor at the University of Tennessee Knoxville. He obtained his doctoraldegree from the University of Illinois at Urbana-Champaign and previously worked as a design engineer at Stanley D. Lindseyposite Design and Task Committee 7 on Evaluation and Repair; a member of the ASCE/SEI 7-28 Snow and Rain Loads Sub- and Associates Ltd. in Atlanta Georgia He is a member of the AISC Committee on Specifications Task Committee 5 on Com-
his M.S. and Ph.D. degrees in structural engineering from the University of Illinois at Urbana-Champaign. Dr. Fisher’s structuralexpertise has resulted in authoring and co-authoring 16 books and numerous technical publications. He has lectured for AISCthroughout the United States and Mexico.
Dr.Fisher served as the chair of the AISC Committee on Specifications from 2003 to 2010. He continues to be active on several AISC Specification Task Committes. He is an emeritus member of the AISI Cold-Formed Specification Committee. In addition Dr. Fisher serves as the consulting engineer to the Steel Joist Institute.
In 1984 Dr. Fisher received the T.R. Higgins Lectureship Award presented by AISC and in 2000 he received the AISC Lifetime Achievement Award. Both awards recognized his exceptional contribution to the steel construction industry. He received AISC°shighest award the J. Lloyd Kimbrough Award in 2006. In 2020 Dr. Fisher received the AISC Steel Conference Speaker award.
Acknowledgments
The authors thank the American Institute of Steel Construction for funding the development of this document and for assistancein its preparation. The authors thank Paxton Lifsey master’s student at the University of Tennessee Knoxville for assistancepreparing figures. The authors thank the following reviewers of this document including members of the American Institute of Steel Construction and the Steel Joist Institute for their constructive ments.
J.R. Mujagic Chris RaebelJoe Voigt
Josh Buckholt Michael DeschCindi Duncan Arvind Goverdhan
Preface
This AISC/SJI Design Guide is based on the 2022 edition of ASCE/SEI 7 Mintimuem Design Loads and Associated Criteria forBsildings and Other Srcnres the 2022 editionof theAISC SpecifcationforSrructrl Steel Bildings and the 2020edition of the SJI Standrd Specifications for K-Series LH-Series and DLH-Series Open Web Steel Joists and for Joist Girders. It providesguidance for the design of roof systems to avoid or resist ponding instability and water accumulation. The motivation for this e sp oop u od o s ba ss upo s u si nuiss opo ss ssbuilding officials designers engineers students and others.
