Cyclopedia of architecture, carpentry, and building : a general reference work . onthe rivets in this member is the resultant of these two forces, and is: V43 700- + 24 965- = 50 300 pounds. Since the rivets are f-inch and the plates f-inch, the number of rivetsrequired is 50 300 -^ 5 630 = 9 shop rivets. This number should beplaced symmetrically with respect to the intersection of the twochords. In case the point of application of the reaction had notcoincided with the intersection of the chords, the number of rivets mustbe computed according to the formula on page 36. For the joint at L^, a
Cyclopedia of architecture, carpentry, and building : a general reference work . onthe rivets in this member is the resultant of these two forces, and is: V43 700- + 24 965- = 50 300 pounds. Since the rivets are f-inch and the plates f-inch, the number of rivetsrequired is 50 300 -^ 5 630 = 9 shop rivets. This number should beplaced symmetrically with respect to the intersection of the twochords. In case the point of application of the reaction had notcoincided with the intersection of the chords, the number of rivets mustbe computed according to the formula on page 36. For the joint at L^, a sufficient number of rivets must be put in,in order to take up the difference in stress between the membersL, L, and L, L,. The number required is (43 700 - 37 450) - 3 7>50= 2 shop rivets. The purlins have a horizontal shear at each end, of -f/ -^ 2 =2 490 -^ 2 = 1 245 pounds. This requires 1 245 -^ 4 420 = 1 shoprivet or 1 field rivet, to keep them from sliding down on the topchord. Clip angles 5 by 3^ by |-inch will be used as shown in Plate I- 270 ROOF TRUSSES 57 Clii. These help in the erecting of the purhns, since they are shop-rivetedto the truss and therefore hold the purlins in place while they arebeing field-riveted to the truss and to the clip angles (see Fig. 77). Rivets in Lateral Bracing. The plates of the lateral bracing shouldbe made j inch thick. The 3-inch leg of the angle will beplaced against the plate. Riv-ets f inch in diameter can thenbe used, and the strength of thejoint will be governed by bear-ing in the J-inch plate. Thestress for which the rivets areto be determined is given on It is 27 000 pounds. Thenumber of field rivets in bearingin j-inch plate, required to with-stand the stress, is (27 000 ^ 4 420) X | = 9. The size and shapeof the plate can be determined only while making the detailed draw-ing (see Plate III, p. (U). Design of the Splice. The general details of the splice will be asshown in Fig. GS. The plate underneath will l)e made
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