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RISS 인기검색어
- 검색키워드
- 저자 : S. S. Ajeesh (검색결과 2 건)
- 무료
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- 유료
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Direct Strength Design of Cold-Formed Steel Members Using Constrained Spline Finite Strip Method
S. S. Ajeesh,S. Arul Jayachandran 한국강구조학회 2019 International Journal of Steel Structures Vol.19 No.6
Direct strength method (DSM) for the design of cold-formed steel members recommends fi nite strip method (FSM) for calculating the elastic buckling stresses corresponding to local, distortional and global buckling, which are considered to be the basic input parameters for design. This paper presents application of constrained spline fi nite strip method (cSFSM) developed by authors for calculating pure elastic buckling stresses in DSM and hence predicting the ultimate member capacity in uniform fl exure and axial compression. The elastic buckling stresses are determined for a specifi ed set of experiments available in literature using cSFSM by considering diff erent end conditions and failure modes and the elastic stress values are applied in DSM for calculating ultimate member capacity. For beams with simply supported-warping free ends and columns with simply supported-warping fi xed ends, the DSM evaluated results using cSFSM produces results comparable with experiments. The results obtained by the comparison of DSM with experiments were not satisfactory for fi xed columns and beams with simply supported-warping fi xed ends.
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Distortional–Global Interactive Buckling of Thin-Walled Columns with Complex Lips
Navin K. Vincent,Allen Varghese,S. S. Ajeesh 한국강구조학회 2023 International Journal of Steel Structures Vol.23 No.4
When the interaction of buckling modes in thin-walled steel columns are considered, most of the existing research deals with local–distortional mode or local–global mode interaction. The studies available on compression members undergoing distortional–global buckling mode interaction is comparatively less. This study analyses the behaviour of cold-formed thin-walled compression members having complex lips under axial compression and undergoing interaction of distortional–global buckling (D–G) modes. Finite element analytical (FEA) study is performed on members with complex lips for a range of geometries after validating the finite element model with existing experimental results. Member dimensions are selected based on elastic buckling analysis results such that the member fails predominantly in D–G interaction. Comparison of nonlinear finite element results are made with; (1) direct strength method (DSM) for the design of compression members, and (2) modified DSM for columns considering the interaction of buckling modes proposed in the literature. Modifications are proposed for the existing DSM expression to incorporate the D–G interaction, which provides a closer comparison with FEA results.
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