Essentials in the theory of framed structures . int o of the distorted outline coincides with joint oof the original outline. The distorted outline must then berotated about joint o, until joint 12 of the distorted outline islevel with joint 12 of the original outUne. Since joint o is nowto be considered fixed in position, instead of joint 4, the originis moved from point 4 to point o in Fig. 187. Draw the verticalthrough point o, and the horizontal through point 12, intersect-ing at 12; and on 0-12, as the bottom chord, construct thetruss to scale. The total vertical displacement or deflectio
Essentials in the theory of framed structures . int o of the distorted outline coincides with joint oof the original outline. The distorted outline must then berotated about joint o, until joint 12 of the distorted outline islevel with joint 12 of the original outUne. Since joint o is nowto be considered fixed in position, instead of joint 4, the originis moved from point 4 to point o in Fig. 187. Draw the verticalthrough point o, and the horizontal through point 12, intersect-ing at 12; and on 0-12, as the bottom chord, construct thetruss to scale. The total vertical displacement or deflection of any joint maybe considered as the result of three operations—distortion,vertical translation and rotation. As the distortion takes place,joint 2 is lowered the vertical distance from point 4 to point 2in the distortion diagram. The vertical translation lowers the 296 THEORY OF FRAMED STRUCTURES Chap. VII joint the vertical distance from point o to point 4. Finally therotation lowers the joint the vertical distance from point 2 to --I^ +3080 Z +3080 4 +3150 6 -^3150FIG. 186 8 +3080 10 +3080 12
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectstructu, bookyear1922
