Snow Loads for Structural Design in Montana (Revised 2004)

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List of Tables 1.1 Design Snow Loads at Monitored Stations in Montana . . . . . . . . . . . . . . . . . 10 2.1 Cutout from Table 1.1 for Example 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . 63 2.2 Output from Snow Load Finder-Belgrade . . . . . . . . . . . . . . . . . . . . . . . . 63 2.3 Cutout from Table 1.1 for Example 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 2.4 Output from Snow Load Finder-Martinsdale . . . . . . . . . . . . . . . . . . . . . . . 66 2.5 Balanced snow load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 2.6 Unbalanced snow load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69 A.1 Snow load data for NWS stations in Region 1 . . . . . . . . . . . . . . . . . . . . . . 76 A.2 Snow load data for NWS stations in Region 2 . . . . . . . . . . . . . . . . . . . . . . 78 A.3 Snow load data for NWS stations in Region 3 . . . . . . . . . . . . . . . . . . . . . . 80 A.4 Snow load data for NWS stations in Region 4 . . . . . . . . . . . . . . . . . . . . . . 82 A.5 Snow load data for NWS stations in Region 5 . . . . . . . . . . . . . . . . . . . . . . 86 A.6 Snow load data for NWS stations in Region 6 . . . . . . . . . . . . . . . . . . . . . . 88 A.7 Snow load data for SNOTEL stations in Montana . . . . . . . . . . . . . . . . . . . . 92 B.1 Original snow depth/snow-water equivalent equations . . . . . . . . . . . . . . . . . 105 B.2 Final snow depth/snow-water equivalent equations . . . . . . . . . . . . . . . . . . . 106 3
Preface This report provides recommended ground snow loads that can be used in the design and analysis of structures across the state of Montana. This document is a revision of an earlier publication by Dr. Fred F. Videon and James P. Schilke titled Snow Loads for Structural Design in Montana. Since its issue in 1989, the publication of Videon and Schilke has become an indispensable aid to building designers and building officials working in the state. This revision updates the ground snow load values for Montana based on the additional data available since the earlier work was completed in 1989, and it also takes advantage of advances in computer technology in the intervening years to offer the designer a broader overview of the results of the snow load analyses. The authors thank the Civil Engineering Department at Montana State University, as well as the Montana Section of ASCE for their financial support in conducting this study and preparing this document. The authors would also like to thank Dr. Dan VanLuchene for reviewing the example problems and Phil Farnes for reviewing the snow loads. Dr. VanLuchene has been teaching structural engineering at Montana State University for almost 20 years. Phil Farnes has been investigating ground snow loads in Montana for over 30 years, and assembled one of the first statewide snow load maps in 1975 (Farnes, 1975). 4 Gregory P. Theisen Michael J. Keller Jerry E. Stephens Fred F. Videon James P. Schilke
Page 1 and 2: Snow Loads for Structural Design in
Page 3: List of Figures 1.1 Map of Montana
Page 7 and 8: ASCE 7-02. Presented in Appendix A
Page 9 and 10: The contour maps at the end of this
Page 11 and 12: Table 1.1: Design Snow Loads at Mon
Page 19 and 20: CONTOUR INTERVALS 25 30 354045 500
Page 21 and 22: Chapter 2 Snow Load Design Examples
Page 23 and 24: calculation is provided in Example
Page 25 and 26: 2.2 Example 2 - Drifting Snow Requi
Page 27 and 28: Table 2.3: Cutout from Table 1.1 St
Page 29 and 30: pg = 198.7psf (same as example 3).
Page 31 and 32: 2.8 References Ellingwood, B., and
Page 33 and 34: Station NWS station name. The stati
Page 35 and 36: Snow loads for the SNOTEL stations
Page 37 and 38: Station County Table A.1: Snow load
Page 45 and 46: Station County Latitude Longitude E
Page 51 and 52: Station County Latitude Longitude E
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A.2 National Weather Service (NWS)
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Therefore, a snow season consisting
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tions. The lognormal and the log-Pe
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A.4 Determining the 50-year MRI Gro
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snow course station data could be l
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snow loads that result when the sam
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Data Snow Depth/ Water Equivalent D
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Region 2 - 4000 ft to 5000 ft Regio
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Page 73:
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Snow Loads for Structural Design in Montana (Revised 2004)

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