Snow Loads

by O'Rourke, Michael J.; Wrenn, Peter D.

• ISBN13: 9780784407257
• ISBN10: 0784407258
• Format: Paperback
• Copyright: 2004-03-01
• Publisher: Amer Society of Civil Engineers

Table of Contents

List of Figures	vii
List of Tables	xi
Preface	xiii
Acknowledgments	xv
Introduction	1	(4)
Ground Snow Load	5	(6)
Influence of Latitude, Elevation, and Coastlines	6	(2)
Site-Specific Case Studies	8	(2)
Example 2.1: Ground Snow Loads	10	(1)
Flat Roof Snow Loads	11	(14)
Measured Conversion Factors	11	(3)
Flat Roof Snow Load	14	(2)
Exposure Factor (Ce)	16	(3)
Example 3.1: Roof Exposure	19	(1)
Thermal Factor (Ct)	20	(1)
Importance Factor (I)	21	(1)
Minimum Roof Loads	21	(4)
Sloped Roof Snow Load	25	(8)
Example 4.1: Uniform Snow Load, Monoslope Roof (1 on 12)	27	(2)
Example 4.2: Uniform Snow Load, Monoslope Roof (4 on 12)	29	(1)
Example 4.3: Uniform Snow Load, Wide Gable Roof	29	(1)
Example 4.4: Uniform Snow Load, Narrow Gable Roof	30	(3)
Partial Loading	33	(12)
Continuous-Beam Systems	34	(1)
Other Structural Systems	35	(3)
Example 5.1: Uniform and Partial Snow Load, Monoslope Roof with Overhang	38	(1)
Example 5.2: Partial Snow Load, Continuous Purlins in Gable Roof (1 on 12)	39	(3)
Example 5.3: Partial Snow Load, Continuous Purlins in Gable Roof (3 on 12)	42	(1)
Example 5.4: Partial Snow Load, Continuous Purlins with Low Ground Load	43	(2)
Unbalanced Loads	45	(12)
Hip and Gable Roofs	45	(3)
Example 6.1: Unbalanced Snow Load, Narrow Gable Roof	48	(1)
Example 6.2: Unbalanced Snow Load, Wide Gable Roof	48	(1)
Curved Roofs	49	(2)
Example 6.3: Balanced and Unbalanced Snow Load, Curved Roof	51	(2)
Sawtooth-Type Roofs	53	(1)
Example 6.4: Unbalanced Snow Load, Sawtooth Roof	54	(1)
Domes	54	(3)
Drifts on Lower Roofs	57	(16)
Leeward Drift	58	(7)
Windward Drift	65	(1)
Example 7.1: Roof Step Drift Load	65	(3)
Example 7.2: Roof Step Drift, Limited Height	68	(1)
Example 7.3: Roof Step Drift, Adjacent Structure	69	(1)
Example 7.4: Roof Step Drift, Low Ground Snow Load	69	(4)
Roof Projections	73	(8)
Example 8.1: Parapet Wall Drift	74	(3)
Example 8.2: Roof Top Unit (RTU) Drift	77	(1)
Example 8.3: Parapet Wall Drift, Low Ground Snow Load	78	(3)
Sliding Snow Loads	81	(8)
Example 9.1: Sliding Snow Load, Residential Gable Roof (4 on 12)	83	(2)
Example 9.2: Sliding Snow Load, Commercial Gable Roof (1 on 12)	85	(2)
Example 9.3: Sliding Load, Low Ground Snow Area	87	(2)
Rain-on-Snow Surcharge Loads	89	(6)
Example 10.1: Uniform Design Snow Load, Monoslope Roof (1/4 on 12)	93	(1)
Example 10.2: Uniform Design Snow Load, Gable Roof (1/4 on 12)	94	(1)
Ponding Instability and Existing Roofs	95	(2)
Ponding Instability	95	(1)
Existing Roofs	96	(1)
Frequently Asked Questions	97	(16)
References	113	(2)
Appendix	115	(16)
Index	131