SNOW ACCUMULATIONS IN CANADA CASE HISTORIES-1
ON A WELL-SHELTERED HORIZONTAL SURFACE, SUCH AS A FLAT ROOF OF A HOUSE IN A FOREST CLEARING, SNOW WILL PRODUCE NEARLY UNIFORMLY-DISTRIBUTED LOADS WHICH CAN BE PREDICTED STATISTICALLY WITH REASONABLE ACCURACY. ACTUAL SNOW LOADS ON EXPOSED ROOFS ARE, HOWEVER, NONUNIFORM AND ARE DIFFICULT TO PREDICT BECAUSE THEY ARE AFFECTED BY NUMEROUS INFLUENCES. IN MANY AREAS OF CANADA WIND HAS A PROFOUND EFFECT ON THE MAGNITUDE AND DISTRIBUTION OF SNOW LOADS ON ROOFS. SINCE WIND PRODUCES SNOW DRIFTING, IT IS ABSOLUTELY ESSENTIAL IN DETERMINING THE PROPER DESIGN SNOW LOAD FOR A GIVEN ROOF TO TAKE INTO ACCOUNT THE EFFECTS OF WIND AND THE SHAPE OF THE ROOF. OTHER FACTORS SUCH AS THE POSSIBILITY OF SLIDING OF SNOW FROM ROOFS OF DIFFERENT SLOPE MUST ALSO BE CONSIDERED. THESE FACTORS, THEN, MUST BE USED TO MODIFY THE BASIC LOAD GIVEN BY THE SNOW LOAD ON THE GROUND. GUIDANCE WITH REGARD TO THE INFLUENCE OF WIND AND OTHER FACTORS ON THE ROOF LOADS IS NOW PROVIDED IN THE 1965 CODE. THIS GUIDANCE, HOWEVER, CAN ONLY DEAL WITH THE RELATIVELY COMMON TYPES AND SHAPES OF ROOFS. MANY UNUSUAL TYPES OF ROOFS AND CONDITIONS WILL HAVE TO BE CONSIDERED BY DESIGNERS. IN AN EFFORT TO PROVIDE FURTHER GUIDANCE TO DESIGNERS, WHO ARE RESPONSIBLE FOR MAKING THE BEST POSSIBLE ESTIMATE OF THE PROBABLE SNOW LOAD, THE DIVISION IS STARTING TO PUBLISH CASE RECORDS OF INTERESTING NONUNIFORM SNOW LOADS. THIS REPORT IS THE FIRST IN THE SERIES. /CGRA/
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Supplemental Notes:
- No 237, 1-29 PP, 17 FIG, 1 TAB, 17 PHOT, 1 REF
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Authors:
- Schriever, W R
- Faucher, Y
- Lutes, D A
- Publication Date: 1967-1
Media Info
Subject/Index Terms
- TRT Terms: Avalanches; Case studies; Design load; Load transfer; Roofs; Slopes; Snowdrifts; Wind
- Old TRIS Terms: Snowslides
- Subject Areas: Highways; Maintenance and Preservation;
Filing Info
- Accession Number: 00218133
- Record Type: Publication
- Source Agency: CANADIAN GOOD ROADS ASSOCIATION
- Files: TRIS
- Created Date: Sep 30 1994 12:00AM