Essentials in the theory of framed structures . wn in Fig. 856, in which themoments are zero at A and B. Moments about A Moments about B 1,500 X s = 7,500 4,472 X 30 = 134,160 1,650 X 10 = 16,500 2,236 X 21 = 46,956 900 X 16 = 14,400 900 X 16 = 14,400 2,236 X 21 = 46,956 1,650 X 10 = 16,500 4,472 X 10 = 44,720 1,500 X S = 7,500 85,356 40)130,086 40)48,804 3,252 = Vr i,220 = Vl The truss and columns are shown separately in Fig. known forces acting on the columns are shown by full horizontal forces, represented by dotted lines at a, b, cand d, which the truss must exert on the
Essentials in the theory of framed structures . wn in Fig. 856, in which themoments are zero at A and B. Moments about A Moments about B 1,500 X s = 7,500 4,472 X 30 = 134,160 1,650 X 10 = 16,500 2,236 X 21 = 46,956 900 X 16 = 14,400 900 X 16 = 14,400 2,236 X 21 = 46,956 1,650 X 10 = 16,500 4,472 X 10 = 44,720 1,500 X S = 7,500 85,356 40)130,086 40)48,804 3,252 = Vr i,220 = Vl The truss and columns are shown separately in Fig. known forces acting on the columns are shown by full horizontal forces, represented by dotted lines at a, b, cand d, which the truss must exert on the columns in order to holdthem in equihbrium, are determined as follows: Moments about c , , J 2,020 X 16 „ . , . , force at d = ^ = 7,787 actmg to the nght. force at c = 7,787 — 2,920 = 4,867 acting to the left. Moments about a4,866 X 16 = 77,856 1,650 X 6 = 9,9001,500 X II = 16,5001,500 X 16 = 24,000 50,400 6)27,456 4,576 = force at b acting to the right,force at o = 900 + 1,650 + 4,576 + 1,500 + 1,500 — 4,866 = 5,260 acting to the Fig. 87. Sec. II ROOF TRUSSES 123 Table IV.—Compaeison of Wind Stresses—i,ooo-lb. Units Mem- Wall bearing truss Millbuild-ingtrussCase V Wind loadacting ber Case I Hi = 2,236 H2= 0 Case IIHi = 0Hi = 2,236 Case IIIHi = 1,118Hi = 1,118 Case IV Hi = 1,537Hi = 699 vertically, both sides Case VI I -S-6 -S-6 -S-6 -11-3+ -9-8 2 -S-6 -S-6 -II-3+ 9-3 -9-3 3 -S-6 -S-6 -S-6 - + i-i 4 -5-6 -S-6 -S-6 -5-6 - + S +70 +4-8 +S-9 + + 4-6- 3-5 + 6 + +3-4 +4-S +4-9 + 4-S- S-7 +7-6 7 + + 1-7 + — I. I + 8 + + + 1-4 + 1-4 + 9-3 + 1-3 9 -2-S -2-S -2-S -2-S - S-o+ -2-3 10 + + + + S-S- + II +4-2 +4-2 +4-2 +4-2 + 4-7 +3-8 12 0 0 0 0 + 0 13 + + 1-4 + 1-4 + 1-4 + + 1-3 14 -1-3 -1-3 -1-3 -1-3- - 1-3 — 124 THEORY OF FRAMED STRUCTURES ChAP. Ill Since the forces which the truss exerts on the columns must berespec
Size: 2512px × 995px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectstructu, bookyear1922
