. The strength of materials; a text-book for engineers and architects. iV. 60 iV^. 120. Fig. 132a.—Lillys Column Formula. It will be remembered that /^, gives the safe stress per for struts with central loads. If the loads are eccentric wemust proceed as described later. Then if A = area of section of strut, Safe load = P, = /^^ . A. If, as often occurs in practice, we are given the load but 292 THE STRENGTH OF MATERIALS have not designed the section, so that we do not know thebuckling factor, we can often get a rough idea by taking atrial value of ^ equal to about f /,, i. e. 4 to
. The strength of materials; a text-book for engineers and architects. iV. 60 iV^. 120. Fig. 132a.—Lillys Column Formula. It will be remembered that /^, gives the safe stress per for struts with central loads. If the loads are eccentric wemust proceed as described later. Then if A = area of section of strut, Safe load = P, = /^^ . A. If, as often occurs in practice, we are given the load but 292 THE STRENGTH OF MATERIALS have not designed the section, so that we do not know thebuckling factor, we can often get a rough idea by taking atrial value of ^ equal to about f /,, i. e. 4 tons per sq. in. forsteel, and finding the area requisite for this stress. This willgive us an idea of the area required, and we can choose asection with roughly this area, and see by finding its bucklingfactor what is the safe load on it.
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