. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. thickness of lug = ins. Use 1-in. plate as assumed. 49 000 Length required for shear between lugs = ^ :^—^ = ins. ^ X loU X o Use 1 ft. ins. 49 000 Depth of toe = -^ ^ = ms. Use 4 ins. ^ 1600 X 8 Bearing stress of 1600 lbs. per sq. in. is used, as the timberfibers are confined and therefore capable of taking full end com-pression. Stress in bolster = horizontal component of stress in two |-in. bolts = 4830 lbs. x 2 x = 4830 lbs. 4830No. of shear
. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. thickness of lug = ins. Use 1-in. plate as assumed. 49 000 Length required for shear between lugs = ^ :^—^ = ins. ^ X loU X o Use 1 ft. ins. 49 000 Depth of toe = -^ ^ = ms. Use 4 ins. ^ 1600 X 8 Bearing stress of 1600 lbs. per sq. in. is used, as the timberfibers are confined and therefore capable of taking full end com-pression. Stress in bolster = horizontal component of stress in two |-in. bolts = 4830 lbs. x 2 x = 4830 lbs. 4830No. of shear pins required = ^^—^ = Use one 2-in. pin. oUU X oIn the cast-iron shoe shown in Fig. 103 the projection of thetoe Umited the bearing stress on the top of the chord. ,In theform shown in Fig. 104, since the line of thrust intersects the shoepractically at the end of the toe, the inclined bolts will be calledinto play to prevent a rotation of the shoe, which would greatly increase the toe pres-sure. The bolts, there-. _, fore, must be always BTcbles ik^3k8 ^ig^t m Order to XounfersunftRiveheaU. secure an approxi-. 4-^gp^^iJ^f^ mately uniform ver- tcr^Sm^ tical pressure. ~|r 6x8^Bofshr X^BoJfs This form of joint 2,%\3>%k5%Washers 10, ^^6x3^gx5>8 Washers, jg considered veryHill Bearing Edge of Tables. ?, ? good because it isFig. 105—Detail of End Joint simple in action and comparatively easy to frame into the timber. Both lugs musthave an even bearing against the wood and this is a hard thingto secure, but if the inspection is good the work will be all there is more than one bearing surface this objection JOINTS AND CONNECTIONS 179 always arises. If the fitting is not properly done the joint canbe shimmed with thin metal shims. Mr. Dewell makes- the following comments: This shoe canbe used only for stresses requiring not more than two lugs, henceits field of application is limited. Another defect is that theforge work is difficult with the thickness of
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