AISC D840 2024

$27.08

Design Guide 40: Rain Loads and Ponding

Published By	Publication Date	Number of Pages
AISC	2024

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Description

This design guide provides an in-depth review of rain loads and ponding effects to help design professionals properly and efficiently design for ponding on roofs constructed with structural steel, open web steel joists, and joist girders. It includes several recommended methods of analysis that can be used to consider the effects of ponding, methods of design accounting for ponding effects, and a presentation of the SJI Roof Bay Analysis Tool. These methods are thoroughly discussed and then demonstrated with many helpful design examples.

PDF Catalog

PDF Pages	PDF Title
1	Rain Loads and Ponding
3	Inside Cover Page
4	Copyright
5	Authors Acknowledgments Preface
7	Table of Contents
9	Chapter 1 Introduction 1.1 Behavior of Roofs under Rain Loads
11	1.2 Current Code Provisions and Requirements
15	1.2.1 International Building Code 1.2.2 International Plumbing Code 1.2.3 Material-Specific Standards 1.2.4 Provisions from FM Global
16	1.2.5 Ponding and Snow Loads 1.3 Obsolete Methods of Design for Ponding
19	Chapter 2 Recommended Method of Design for Ponding 2.1 Design Basis 2.2 Calculation of Required Strength 2.3 Calculation of Rain Load Including Ponding Effects
20	2.4 Calculation of Snow Load Including Ponding Effects 2.5 Calculation of Available Strength
21	2.6 Bays with Low Slope
22	2.7 Serviceability 2.8 Practical Considerations
24	2.9 Recommendations when Drain Sizes Are Not Yet Known
25	Chapter 3 Methods of Analysis for Ponding 3.1 Closed-Form Solutions 3.2 Amplified First-Order Analysis
26	3.3 Negative Spring Stiffness 3.4 Iterative Analysis
29	Chapter 4 SJI Roof Bay Analysis Tool
30	4.1 Input
32	4.2 Analysis Procedure 4.3 Output
33	4.4 Design Procedure
35	Chapter 5 Design Examples 5.1 Example 1—Existing Dead Flat Roof
38	5.2 Example 2—Open Web Steel Joist Roof Design
41	5.3 Example 3—Structural Steel Roof Design
50	5.4 Example 4—Bay with Low Slope and Secondary Members Perpendicular to a Free-Draining Edge
53	5.5 Example 5—Bay with Low Slope and Secondary Members Parallel to a Free-Draining Edge
61	Chapter 6 Concluding Notes
63	Symbols
65	Glossary
67	References
70	Back Cover