Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 45 79. Breaking Load of Rafters.âIn finding the break- ing- load of timl)crs placed in any oblique position as shown in Fig. 21, take the length of the rafter equal to the horizontal S2:)an ac and proceed as in 77 and 78. 80. Table of Safe Quiescent Center Loads for Hor- izontal Beams of White Pine Supported at Both Ends.â In this table the safe load is taken at one-sixth of the theoretical breaking load. This large reduction is made necessary on account of the cross-grain of timbers and joists and the larg
Elementary lessons in the physics of agriculture elementarylesson01king Year: 1894 45 79. Breaking Load of Rafters.âIn finding the break- ing- load of timl)crs placed in any oblique position as shown in Fig. 21, take the length of the rafter equal to the horizontal S2:)an ac and proceed as in 77 and 78. 80. Table of Safe Quiescent Center Loads for Hor- izontal Beams of White Pine Supported at Both Ends.â In this table the safe load is taken at one-sixth of the theoretical breaking load. This large reduction is made necessary on account of the cross-grain of timbers and joists and the large knots which weaken very materially the pieces. Where a judicious selection is made in placing the joists, laying the inherently weak pieces in places where little strain can come upon them, much saving of lumber may be made. si r Span 10 feet. Span 12 feet. Span 14 feet. Span 16 feet. Breadth. Breadth. Breadth. Breadth. s 2 in. 4 in. Gin. 2 in. 4 in. (5 in. 2 in. 4 in. 6 in 2 in. 4 in. 6 in. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. lbs. 4 20) 480 720 200 400 600 172 344 516 150 300 450 6 540 1080 1620 450 noo 1350 386 772 1158 336 672 1008 8 9()0 1020 2880 800 KHIO 2400 686 1372 2058 600 1200 1800 10 1500 8000 4500 1250 2500 3750 1072 2144 3210 930 1872 2808 13 2160 4320 6480 1800 3600 5400 1544 3088 4632 1350 2700 4050 Breadth. Breadth. Breadth. Breadth. 8 in. lbs. lOin. ;i. 12 in. lbs. 8 in. 10 in. lbs. 12 in. lbs. 8 in. 10 in. 2 in. lbs. 8 in. lbs. 10 in lbs. 12 in. lbs. m. lbs. 4 mo 1200 1440 800 1000 1200 688 860 1032 600 750 900 <j 2U!() 2700 8210 1800 2250 2700 1544 1930 2316 1344 KiSO 2016 8 3H-I(i 4S()() 57(i() 3200 4000 4800 2744 3430 4116 2400 odilll ;;ooo 10 00(10 7500 0000 5000 6250 7500 4288 5360 6432 3744 â KISO 5016 12 8040 10800 12000 7200 9000 10800 6176 7720 9264 5400 6750 8100
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