Local Plastic Buckling of A514 Steel Members

by John F. McDermott,

Serial Information: Journal of the Structural Division, 1969, Vol. 95, Issue 9, Pg. 1837-1850

Document Type: Journal Paper

Abstract: Axial-compression tests on 12 cruciform shapes made from ASTM A514 steel plates demonstrated the need to limit the ratio of the flange projection to the flange thickness (b/t) to about 5 in A514 steel to achieve yielding followed by sustained plastic strain (over 3% strain before gradual unloading), and to ensure suitability of A514 steel compression elements for plastic design. The critical plastic local buckling stress for A514 steel members with (b/t) < 5 can be accurately computed from the deformation-theory equation, σc = σy + Et [0.385 (t/b)2 – 0.005] by using values of σy and ET measured in tension tests, and conservatively computed by using σy = 100,000 psi (the minimum specified for A514 steel) and Et = 220,000 psi. Similarly, the strain corresponding to maximum stress can be predicted approximately by the deformation-theory equation, c = 0.385 (t/b)2.

Subject Headings: Steel plates | Plastic design | Steel | Flanges | Plastics | Axial forces | Buckling |

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