The Ovalisation of Steel Circular Hollow  Sections under Bending

Amer M. Ibrahim; Manahel Sh. Khalaf

doi:10.24237/djes.2018.11103

Authors

Amer M. Ibrahim Department of Civil Engineering, Engineering College, University of Diyala, Iraq
Manahel Sh. Khalaf
manahelshahath@gmail.com
Department of Civil Engineering, Engineering College, University of Diyala, Iraq

Keywords:

Circular Hollow Sections, Ovalisation, Bending, Diameter to thickness ratio, Local buckling and Cross-section behavior.

Abstract

This paper investigates the ovalisation behavior of the Steel Circular Hollow Sections (CHSs) when subjected to bending moment. The experimental program included testing of ten specimens in four groups in order to examine the influence of changing the diameter, thickness, length and the presence of openings on the ovalisation phenomenon of these specimens.The experimental results showed that the ovalisation of the specimen cross-section appears clearly when the diameter to thickness ratio (D/t) is ranging from 17 to 50, while the ovalisation of the specimens that have D/t ratio greater than 50 is very little or unclear because the instability of these specimens are controlled by the local buckling. In addition, the change of the specimen length and the presence of openings didn’t cause the cross-section ovalisation.

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