. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. t one line, considering thatthe greatest danger is shearing on a line through the centerof the bolts. The length required for shear on the end bolt JOINTS AND CONNECTIONS 161 1450 = in., so the end bolts may be placed -f 6 X 120= ins. from the end of the plank. In Fig. 95 is shown (with width exaggerated) the arrangementof the bolts. The spacing so carefully figured is the closest safespacing. The bolt& can be placed much farther apart if desired.
. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. t one line, considering thatthe greatest danger is shearing on a line through the centerof the bolts. The length required for shear on the end bolt JOINTS AND CONNECTIONS 161 1450 = in., so the end bolts may be placed -f 6 X 120= ins. from the end of the plank. In Fig. 95 is shown (with width exaggerated) the arrangementof the bolts. The spacing so carefully figured is the closest safespacing. The bolt& can be placed much farther apart if the middle splice carrying all the tension place two bolts seveninches from the ends of the planks. Space the remaining bolts10 ins. center to center. The 14-ft. lap in the middle of the trussis then connected up so that the two outer planks act to carry 2-^ /3^/^^^^ a. ? 2-#-->U- 2-^-^--24---^<-24--^-24-^--24-y^--24---^- Fig. 95—Methods of Splicing Lower Chord Composed of Several Pieces half the tension from one support to the other. It now remainsto bolt the other two outside planks to them in order that the restof the tension can be carried. There should be two bolts close to each joint, so, six inches fromthe end of the planks, put in two bolts. Each joint has 16 bolts intwo lines, which bolts may be spaced 12 ins. center to center. Forthe rest of the chord put bolts at intervals of 4 ft. staggered andat the very end put two bolts through 6 ins. from the end to makea firm bearing for the end of the brace. Between the bolts,used merely to hold the planks firm, large spikes may be drivenat intervals of about 12 ins. to make the whole constructionmore rigid. The same principles apply when five or more planks are such a case, however, it often happens that long planks maybe placed in the middle of the span in such manner that all th
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