TY - JOUR ID - TI - The Ovalisation of Steel Circular Hollow Sections under Bending AU - Amer M. Ibrahim عامر محمد ابراهيم AU - Manahel Sh. Khalaf PY - 2018 VL - 11 IS - 1 SP - 12 EP - 19 JO - DIYALA JOURNAL OF ENGINEERING SCIENCES مجلة ديالى للعلوم الهندسية SN - 19998716 26166909 AB - 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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