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By Michael J. O'Rourke

ISBN-10: 0784407258

ISBN-13: 9780784407257

Snow Loading is a common and dear reason behind structural functionality mess ups. in truth, snow is the controlling roof load in half US States. As a structural engineer, you want to be accustomed to snow rather a lot. This booklet will give you the instruments you want to comprehend and make amends for snow lots in structural layout. ''Snow so much: A advisor to the Use and figuring out of the Snow Load Provisions of ASCE 7-02'' is the one booklet of its variety that offers an in depth authoritative interpretation of snow load provisions of ASCE common 7-02. incorporated are examples of flat roof a lot, sloped roof rather a lot, partial rather a lot, in addition to all kinds of traditional flow loading. Readers will enjoy the commonly asked questions part, which addresses and demonstrates the right kind implementation of the provisions of ASCE 7-02, resembling precise snow loading situations and how one can mitigate float lots on latest roofs as a result of new additions. This consultant is key for working towards structural engineers. Twelve informative chapters hide: floor Snow Load, Flat Roof Snow a lot, Sloped Roof Snow Load, Partial Loading, Unbalanced a lot, Drifts on decrease Roofs, Roof Projections, Sliding Snow a lot, Rain-on-Snow Surcharge quite a bit, Ponding Instability and latest Roofs, and regularly requested Questions. Over 70 figures and tables in actual fact illustrate snow load eventualities. moreover, every one bankruptcy includes a variety of labored examples that might enable you in knowing and using tough wind a lot innovations

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Additional info for Snow loads : a guide to the use and understanding of the snow load provisions of ASCE 7-02

Example text

84 (17) Exposure Rating Note: Value in parentheses represents the number of roofs in each subcategory. 48. 7 factor is used because of the scatter observed in the study described above. 33 Exposure Factor (Ce) The ASCE 7-02 exposure factors are shown in Table 7-2. They are a function of the surface roughness category (ranging from city center to shoreline) and the location of the structure within the regional terrain (ranging from fully exposed to sheltered). 0 (Wind Loads). They are intended to capture the overall windiness of the area surrounding the site and define the variation of wind velocity with height within the atmospheric boundary layer.

1) roofs. Because snow is presumed not to remain on such steeply sloped roofs, consideration of across-the-ridge drift loading is unwarranted. Two unbalanced load distributions are prescribed for hip and gable roofs. For eave-to-ridge distances less than or equal to 20 ft (W^ 20 ft), one distribution applies, and for eave-to-ridge distances greater than 20 ft (W> 20 ft), another distribution applies. 5 ps/Ce on the leeward side) applies to small- and moderate-sized roofs, specifically roofs with an eave-toridge distance W ^ 20 ft.

Except for sawtooth-type roofs, the windward portion of the roof is the snow source and the leeward portion accumulates a percentage of the drifted snow. This is termed an "unbalanced" condition because the leeward portion has more snow than the windward portion. 4) is discussed in the following sections. 1 Hip and Gable Roofs Unbalanced or across-the-ridge drift loads must be considered for the following roof slopes (in degrees): where Wis the horizontal eave-to-ridge distance in feet. The lower bound, in essence, waives the unbalanced load requirement for narrow, low-sloped roofs.

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Snow loads : a guide to the use and understanding of the snow load provisions of ASCE 7-02 by Michael J. O'Rourke


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