Elementary Geometrical Statics An Introduction to Graphic Statics

Cover Elementary Geometrical Statics An Introduction to Graphic Statics
Elementary Geometrical Statics An Introduction to Graphic Statics
W J Dobbs
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A FIG. 132. FIG. 132 a.
The force diagram is shown on the right. The rod oc is a tie, and the other two are struts.
It is often convenient to indicate in the space diagram which of the rods are ties, and which are struts. This we can do by drawing a double or thick line to indicate a strut, and a single or thin line to indicate a tie. Thus : FIG. 133. Or, it is found convenient to mark a strut +, and a tie .
218 POLYGON OF JOINTED RODS 123. Ex. 1. Four fine light rods, of lengths 4, 3, 4, 3 fee
...t respectively, are freely jointed at their extremities to form a parallelogram. To one of the o. Ngular points \ there is attached a mass of 60 pounds, and the whole is supported at the opposite angular point. What UNDER FORCES AT THE JOINTS.
219* horizontal forces must be applied at the other two- angular points, in order that the framework may rest with the lowest joint 5 feet vertically below the point of support ? Find also the stresses in the rods.
FIG. 134 a.
Having constructed the space diagram to scale, let the different portions of the figure be marked with the letters o, a, b, c, d, as indicated.


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