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RISS 인기검색어
- 검색키워드
- 저자 : Akshay Mangal Mahar (검색결과 1 건)
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Direct Strength Method for Cold-Formed Steel Unlipped Channel Columns Subject to Local Buckling
Akshay Mangal Mahar,S. Arul Jayachandran,Mahen Mahendran 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.6
This paper evaluates the strength of unlipped channel columns using the Direct Strength Method (DSM), which applies to the sections with either intermediate or edge stiff eners. The local buckling behaviour of plain cold-formed steel sections (CFS) with fi xed-ends is studied by investigating the results of (i) 25 experimental studies published in the literature and (ii) a numerical study of 105 CFS sections. This paper reveals that the aspect ratio (web height to fl ange width ratio) of the cross-section signifi cantly aff ects the local buckling strength of plain unlipped channel sections. The DSM local buckling strength as specifi ed in the codes of practice ignores the eff ect of this parameter, resulting in unconservative designs for such columns. The diff erence in strength prediction can be up to about 15% for columns with a web height to fl ange width ratio of 3.0. At this aspect ratio, the inter-element stiff ness contribution in the post-buckling stage is the minimum, resulting in a lower strength estimation. To account for this inadequacy, this paper suggests a modifi ed DSM design procedure that accounts for the eff ect of stiff ness contribution from the aspect ratio of the cross-section in the post-buckling stage. The proposed modifi ed DSM design equations agree well with the results of experimental and numerical studies and preserve the target reliability of AISI- S100 (2016) for LRFD.
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