Test of Circular Steel Tubes in Bending

by Donald R. Sherman, (M.ASCE), Prof. of Struct. Engrg.; Univ. of Wisconsin-Milwaukee, Milwaukee, Wisc.,

Serial Information: Journal of the Structural Division, 1976, Vol. 102, Issue 11, Pg. 2181-2195

Document Type: Journal Paper


A series of tests on 10-3/4in. (270-mm) tubes was conducted to determine the plastic rotation capacity of tubular beams. Six different D/t values ranging from 18-102 were used in the tests. Cantilever and fixed-ended beams, with moment gradients (shears) and restraints against ovalizing at the end, are compared with the behavior of the constant moment region of simple beams. Tubes with D/t greater than about 50 do not have sufficient plastic hinge rotation capacity to develop the classical ultimate strength. In the absence of a small moment gradient or stiffening, the plastic moment is not quite reached in tubes with D/t of 35. For inelastic buckling in the range of D/t of 18-80, critical strains appear to be proportional to (t/D)², as opposed to the conventionallinear relationship. Information concerning the complex post-buckling behavior is also presented.

Subject Headings: Material tests | Steel columns | Bending (structural) | Plastics | Rotation | Moment (mechanics) | Plastic hinges | Tubes (structure)

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