Unified slenderness limits for structural steel circular hollow sections
Keywords:circular hollow sections, reliability analysis, section classification, slenderness limits, tubular construction
Circular hollow sections (CHS) are widely used in a range of structural engineering applications. The sections may be hot-finished or cold-formed from a variety of metallic materials with a range of yield strengths. The design of these sections is covered by all major design codes, yet there are significant differences in the treatment of local buckling, as considered through cross-section classification. Cross-section classification criteria relate to rotation capacity and strength requirements (attainment of the plastic or elastic moment in bending and the yield load in compression), while the relative performance of structural CHS is governed by susceptibility to local buckling and is influenced by cross-section slenderness, material stiffness and yield strength, forming process (affecting geometry, material homogeneity and residual stresses), material strain hardening characteristics and ovalization. Furthermore, the classification criteria and reliability requirements vary among the different structural design codes. This paper presents a review of 153 test results on CHS in bending, covering structural steel, aluminium, stainless steel and very high strength steel. Based on the available test data, current codified provisions in the European, North American and Australian Standards are reassessed, and following reliability analyses new unified slenderness limits are proposed for structural steel CHS.
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