. The strength of materials; a text-book for engineers and architects. Professor Lilly of Dublin has devisedformulae for columns which allow for secondary flexure orwrinkling in the column,* and may be regarded as a modifica-tion or correction of Rankines formula. It is of the form 1 + w . - + ac^ V Where tn is a constant depending on the shape of sectiont is the thickness of the metal in the section a is -^-^. (Compare p. 287.) 7)1 5N/,.E â the values of N being given for some sections in Fig. 132a. Use of Strut Formulae.âFig. 133 shows curves of f,, formild steel for various values of the bu
. The strength of materials; a text-book for engineers and architects. Professor Lilly of Dublin has devisedformulae for columns which allow for secondary flexure orwrinkling in the column,* and may be regarded as a modifica-tion or correction of Rankines formula. It is of the form 1 + w . - + ac^ V Where tn is a constant depending on the shape of sectiont is the thickness of the metal in the section a is -^-^. (Compare p. 287.) 7)1 5N/,.E â the values of N being given for some sections in Fig. 132a. Use of Strut Formulae.âFig. 133 shows curves of f,, formild steel for various values of the buckling factor accordingto the first four formulae. It is advisable to draw such acurve to a good scale, choosing one of the formulaeâsay * See Engineering, January 10, 1908, or a more complete paper andbibliography in Proc. Am. Soc. Vol. LXXVI (1913); also TheDesign of Plate Girders and Columns (Chapman & Hall, Ltd.). COLUMNS, STANCHIONS AND STRUTS 291 Rankineâwith a = np,crr\\ such curve can then be usedwhenever the value of /^, is required. N. 50. iV. 60 iV^. 120
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