. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. g and follow the methods given for that special framing. The shed-roof truss (Fig. 147) is so called because it slopes one way, like the roof of a lean-to shed. In this type it is necessary to set off the whole load line, as though the roof had unequal reactions. Notice the difference in the stresses in the member QR and the member OP. The scissors truss shown in Fig. 148 is a very commonFig. 146. - Hog Back Truss. ^^^^^^ ^ favorite with many builders and draftsmen. S
. Practical structural design; a text and reference work for engineers, architects, builders, draftsmen and technical schools;. g and follow the methods given for that special framing. The shed-roof truss (Fig. 147) is so called because it slopes one way, like the roof of a lean-to shed. In this type it is necessary to set off the whole load line, as though the roof had unequal reactions. Notice the difference in the stresses in the member QR and the member OP. The scissors truss shown in Fig. 148 is a very commonFig. 146. - Hog Back Truss. ^^^^^^ ^ favorite with many builders and draftsmen. Setting off the loads onthe load Une it is very quickly discovered that to make theforce diagram close it is necessary to commence with the loadon joint 3, instead of either joint 2 or joint 5. Completingthe diagram, which has to be done by drawing the dotted linesaj and fj, it is discovered that all the members are in dotted lines aj and fj represent the thrust of the truss againstthe walls or tops of the buttresses. The dotted line oj repre-sents the tension required to resist the thrust, consequently the. B 7F_8GJ?-^ II I
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