Cyclopedia of architecture, carpentry, and building : a general reference work . by of. Since the unknown forces \ : must be marked FG and GB, drawfrom F a line parallel to fg, fromB a line parallel to hg,^ and marktheir intersection G. Then the poly-gon for the joint is FABGF, andsince AB acts down (see the polygon) WBG and GF act down and up respec-tively. Therefore, place the properarrowheads on hg and gf near (2), andrecord that the stresses in those mem-bers are both compressive. , we find that BG and GF wale4,100 and 1,875 pounds draw a polygon for joint(
Cyclopedia of architecture, carpentry, and building : a general reference work . by of. Since the unknown forces \ : must be marked FG and GB, drawfrom F a line parallel to fg, fromB a line parallel to hg,^ and marktheir intersection G. Then the poly-gon for the joint is FABGF, andsince AB acts down (see the polygon) WBG and GF act down and up respec-tively. Therefore, place the properarrowheads on hg and gf near (2), andrecord that the stresses in those mem-bers are both compressive. , we find that BG and GF wale4,100 and 1,875 pounds draw a polygon for joint(3) or (6) since there are hut two un-known forces at each joint. At (3) for instance, the unknown forces are those exerted by vh and gh^the known forces being the load (2,000 pounds) and the force 4,100pounds, exerted by hg. Since the unknown forces must bemarked CH and GH, draw from C a line parallel to ch, fromG one parallel to gh^ and mark their intersection H. Then. Fig. 25. 174 STATICS 41 GBCHG is the polygon for the joint, and since BC acts down(see the polygon) CH acts up and HG down. Therefore, placethe proper arrowheads on ch and hg near (3), and record that thestresses in those members are compressive and tensile , we find that CH and HG scale 4,100 and 2,720pounds respectively. It is plain that the stress in any member on the right-hand side is the same as that in the corresponding member onthe left, hence it is not necessary to construct the complete stress diagram. 2. It is required to analyze the truss of Fig. 25 which 2oooltos.
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