The Structural Engineer > Archive > Volume 62 (1984) > Issues > Issue 15 > Tests on the Bending Strength of Circular and Octagonal Steel Tubes, Including the Effect of a Hole
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Tests on the Bending Strength of Circular and Octagonal Steel Tubes, Including the Effect of a Hole

Steel lighting columns are typically constructed from thin-walled tubes of circular or octagonal cross-section, and usually have an access hole in the region of high bending moment. The paper describes a series of tests to failure in pure bending on such tubes, some with and some without an access hole. The access hole was always at the position of extreme-fibre compression-the critical case. Twelve specimens were tested, using a purpose-built loading rig. The results give a quantitative indication of the weakening effect of an access hole, and have formed an essential basis for the development of design formulae described in a companion paper published, also in this issue of The Structural Engineer. S.A. Baban and G.H. Little