Essentials in the theory of framed structures . 1300* ance the moments of the forces acting on the horizontal memberabout D; the vertical force at F is 600 lb. acting it at once on the sketch; and do likewise with each force,as soon as its magnitude and sense are found. The verticalforce at D, is 900 lb. acting upward. Since the inclined mem-ber is puUing downward 600 lb. at F, the horizontal membermust be pulling upward 600 lb. at F. A vertical force of 600lb. acts downward at C, and upward at C. A vertical force of900 lb. acts downward at D. Balance the moments of theforces
Essentials in the theory of framed structures . 1300* ance the moments of the forces acting on the horizontal memberabout D; the vertical force at F is 600 lb. acting it at once on the sketch; and do likewise with each force,as soon as its magnitude and sense are found. The verticalforce at D, is 900 lb. acting upward. Since the inclined mem-ber is puUing downward 600 lb. at F, the horizontal membermust be pulling upward 600 lb. at F. A vertical force of 600lb. acts downward at C, and upward at C. A vertical force of900 lb. acts downward at D. Balance the moments of theforces acting on the inclined member about X 34 = 450 Sec. IV APPLICATION OK PRINCIPLES OP EQUILIBRIUM lOI A horizontal force of 450 lb. acts to the right at C, and to theleft at F; consequently a horizontal force of 450 lb. acts to theleft at C and to the right at F. Finally a horizontal force of 450lb. acts to the left at D, and to the right at D. 300^600*J, II Ji<-6 ??. Pig. 76 Inspect each member and see if the forces acting on each arein equilibrium. Draw shear and bending moment diagrams forthe vertical and horizontal members. I02 THEORY OF FRAMED STRUCTURES Chap. II The resultant of the two forces acting at F must have adirection through C, otherwise the inclined member wouldrotate and not be in equilibrium. Likewise the resultant at Cpasses through F, and the member resists a longitudinalstress. Whenever forces act at only two points on a member,the member reacts as a tie or strut and not as a beam. 64. Problems. 1-6. The structures shown in Figs. 72 to 77 inclusive are to be treated asfollows: Determine the horizontal and vertical components of the reactions,sketch each member separately and find the horizontal and vertical componentsof the forces acting thereon.
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectstructu, bookyear1922
