The Design of Simple Roof-trusses in Wood and Steel

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J. Wiley & sons, 1902 - Graphic statics - 129 pages
 

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Page 23 - Structures freely exposed to the weather, such as railway trestles, uncovered bridges, etc. "Class B (moisture contents, 15 per cent.) — Structures under roof but without side shelter, freely exposed to outside air, but protected from rain, such as roof trusses of open shops and sheds, covered bridges over streams, etc. "Class C (moisture contents, 12 per cent.) — Structures in buildings unheated, but more or less protected from outside air, such as roof trusses of barns, enclosed shops and sheds,...
Page 23 - PRACTICE. Since the strength of timber varies very greatly with the moisture contents (see Bulletin 8 of the Forestry Division), the economical designing of such structures will necessitate their being separated into groups according to the maximum moisture contents in use. MOISTURE CLASSIFICATION. Class A (moisture contents, 18 percent).
Page 26 - For quiescent loads, as in buildings, divide by 4. For moving loads, as in bridges, divide by 5.
Page 39 - Snow, light, weighs per cubic foot 5 to 12 For spans Over 75 ft. add 4 Ibs. to the above loads per square foot. It is customary to add 30 Ibs.
Page 36 - DIAMETER OF PIN IN INCHES. AREA OF PIN IN SQUARE INCHES. MOMENTS IN INCH-POUNDS FOR FIBRE STRAINS OF 15,000 Lbs.
Page 98 - X H" weigh from 1480 to 1850 Ibs. per square of roof (100 square feet), the lap being one-half the length of the tile. Tiles with grooves and fillets weigh from 740 to 925 Ibs. per square of roof. Pan-tiles 14J$" X 10}" laid 10" to the weather weigh 850 Ibs.
Page 32 - W= the breaking weight in pounds. " b = the breadth of the beam in inches " d — the depth of the beam in inches. " L = the length of the beam in inches.
Page 98 - Felt and asphalt 100 Felt and gravel 800-1000 Iron, corrugated 100- 375 Iron, galvanized flat 100- 350 Lath and plaster 900-1000 Sheathing, pine 1" thick yellow, northern 300 " " " " southern 400 Spruce 1" thick 200 Sheathing, chestnut or maple.
Page iii - The tables giving the properties of standard shapes are based upon sections rolled by the Cambria Steel Company.

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