Snow Loads Guide to the Snow Load Provisions of ASCE 7-22 by Michael O'Rourke

Format:

Book

Author/Creator:

O'Rourke, Michael, Author.

Series:

ASCE Press Series

Language:

English

Subjects (All):

Snow loads.

Structural dynamics.

Structural engineering--Standards--United States.

Structural engineering.

Building--Cold weather conditions--Standards--United States.

Building.

Building, Stormproof--Standards--United States.

Building, Stormproof.

Physical Description:

1 online resource (199 pages)

Edition:

1st ed.

Place of Publication:

Reston : American Society of Civil Engineers, 2023.

Summary:

Snow Loads: Guide to the Snow Load Provisions of ASCE 7-22 supplies detailed, authoritative explanations of the snow load provisions contained in Minimum Design Loads and Associated Criteria for Buildings and Other Structures, Standard ASCE/SEI 7-22. Author Michael O’Rourke illustrates the key concepts for applying the provisions to the design of new and existing structures that could collect falling or drifting snow. Like its predecessors that accompanied earlier versions of ASCE 7, this new edition of Snow Loads discusses ground, flat roof, and sloped roof snow loads; partial loads; unbalanced loads; drift on lower roofs; roof projections; sliding snow loads; rain-on-snow surcharge; and ponding instability and existing roofs. Driven by recent changes to the ASCE 7 snow load provisions, this guide also describesSignificant changes to the ground snow loads and drift load provisions of ASCE 7-22,Open framed equipment support structures, and Snow loads for solar paneled roofs.This guide includes worked examples of real-life design problems, as well as answers to frequently asked questions. Snow Loads is an essential supplement to ASCE 7-22 for all engineers, architects, construction professionals, and building officials who work on projects in regions subject to snow.

Contents:

Intro

Snow Loads

Contents

Chapter 1:

References

Chapter 2:

2.1 The Maps: Influence of Latitude, Elevation, and Coastlines

2.2 The Maps: Site-Specific Case Studies

2.3 State Tables

2.4 Exceptions and Clarifications

Example G2-1. Ground Snow Loads

Problem

Solution

Example G2-2. Exemptions

Chapter 3:

3.1 Measured Conversion Factors

3.2 Flat Roof Snow Load (pf)

3.3 Exposure Factor (Ce)

3.4 Thermal Factor (Ct)

3.5 Minimum Snow Loads for Low-Sloped Roofs

3.6 Snow Load for Near-Ground Surfaces

Example G3-1. Roof Exposure

Example G3-2. Thermal Factor

Chapter 4:

4.1 Snow Sliding

4.2 Air-Supported Structures

4.3 Overall Comparison with Observations

Example G4-1. Uniform Roof Snow Load, Monoslope Roof (1 on 12)

Example G4-2. Uniform Roof Snow Load, Monoslope Roof (4 on 12)

Example G4-3. Uniform Roof Snow Load, Wide Gable Roof

Chapter 5:

5.1 Continuous-Beam Systems

5.2 Other Structural Systems

Example G5-1. Uniform and Partial Snow Loads, Monoslope Roof with Overhang

Purlins

Roof Trusses

Example G5-2. Partial Snow Load, Continuous Purlins in Gable Roof (1 on 12)

Example G5-3. Partial Snow Load, Cantilevered Roof Girder System

Chapter 6:

6.1 Hip and Gable Roofs

6.2 Curved Roofs

6.2.1 Balanced Loads

6.2.2 Unbalanced Loads

6.3 Sawtooth-Type Roofs

6.4 Domes

Example G6-1. Unbalanced Snow Load, Narrow Gable Roof

Example G6-2. Unbalanced Snow Load, Wide-Gable Roof

Example G6-3. Unbalanced Snow Load, Asymmetric Gable Roof

Problem.

Solution

Example G6-4. Balanced and Unbalanced Snow Load, Curved Roof

Balanced Load

Unbalanced Load

Example G6-5. Unbalanced Snow Load, Sawtooth Roof

Unbalanced Loads

Reference

Chapter 7:

7.1 Leeward Drift

7.1.1 New Approach

7.1.2 Drift Height Modifying Factor

7.2 Windward Drift

7.3 Adjacent Roofs

7.4 Roof Steps in Series

Example G7-1. Roof Step Drift Load

Leeward Drift

Windward Drift

Example G7-2. Roof Step Drift, Limited Height

Example G7-3. Roof Step Drift, Adjacent Structure

Example G7-4. Roof Steps in Series

Example G7-5. Roof Step Leeward Drift Controls

Example G7-6. Roof Step Windward Drift Controls

Chapter 8:

8.1 Snow Capture Walls

Example G8-1. Parapet Wall Drift

Drift Load

Example G8-2. Rooftop Unit Drift

Example G8-3. Elimination of Rooftop Unit Drift

Example G8-4. Parapet Wall Revised

Example G8-5. Snow Capture Wall

Chapter 9:

9.1 Adjacent Roofs

9.2 Separated Roofs

Example G9-1. Sliding Snow Load, Residential Gable Roof (4 on 12)

Flat Roof and Balanced Loads

Sliding Load

Example G9-2. Sliding Snow Load, Commercial Gable Roof (1 on 12)

Example G9-3. Sliding Load, Separated Roof

Chapter 10:

Example G10-1. Uniform Design Snow Load, Monoslope Roof (1/4 on 12)

Example G10-2. Uniform Design Snow Load, Gable Roof (1/4 on 12)

Chapter 11:.

11.1 Ponding Instability

11.2 Existing Roofs

Example G11-1. Susceptible Bays Purlin-Parallel Geometry

Example G11-2. Susceptible Bays Purlin-Perpendicular Geometry

Chapter 12:

12.1 Floor-Level Snow Loads

12.2 Snow Load on Piping and Cable Trays

Example G12-1. Isolated Cable Tray

Example G12-2. Adjacent Cable Trays

Chapter 13:

13.1 General Recommendations

13.2 Specific Recommendations

13.3 Balanced Load Considerations

13.4 Sliding Load Considerations

13.5 Drift Load Considerations

Chapter 14:

14.1 Design Example 1

14.1.1 General Considerations

14.1.2 Unheated Storage Building

14.1.2.1 Unbalanced Loading

14.1.3 Heated Storage Building

14.1.3.1 Unbalanced Loading

14.1.3.2 Roof Step Drifts

14.2 Design Example 2

14.2.1 Balanced Load

14.2.1.1 Minimum Loading

14.2.1.2 Rain-on-Snow Surcharge

14.2.2 Unbalanced Loads

14.3 Design Example 3

14.3.1 Site A (pg&amp

thinsp

&amp

equals

64 lb/ft2)

14.3.2 Site B (pg&amp

10 lb/ft2)

Chapter 15:

Index

About the Author.

Notes:

Print version record.

Other Format:

Print version: O'Rourke, Michael Snow Loads

ISBN:

1-5231-5556-6

0-7844-8483-X