Design of Cold-formed Steel Built-Up Closed Section Columns using Direct Strength Method

Selvaraj, Sivaganesh and Madhavan, Mahendrakumar (2022) Design of Cold-formed Steel Built-Up Closed Section Columns using Direct Strength Method. Thin-Walled Structures, 171. pp. 1-18. ISSN 0263-8231

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Abstract

Structural behavior of Cold-formed Steel (CFS) face-to-face connected built-up closed cross-section columns is investigated in the present study. The CFS built-up columns are designed as long (L > 20r) and locally slender (λl > 1) to verify the influence of intermediate longitudinal connection spacing and check the appropriateness of the current AISI's Direct Strength Method (DSM) design. A total of 31 axial compression tests were carried out with fixed–fixed end conditions, the design parameters such as local slenderness (λl), global slenderness (λc), intermediate longitudinal fastener spacing (a), and length of the column (L) are varied. The failure modes of the column are summarized and the reason for them is elucidated. The influence of intermediate longitudinal connection spacing was observed in the failure modes and ultimate loading capacity. The test results including ultimate load and failure modes were compared with the current direct strength method design predictions. As a preliminary work towards improving the current AISI design approach, a modified local slenderness (λlm) expression is suggested to consider the influence of intermediate longitudinal fastener spacing in the design strength of cold-formed steel built-up closed cross-section columns. © 2021 Elsevier Ltd

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IITH Creators:

IITH Creators	ORCiD
Madhavan, Mahendrakumar	UNSPECIFIED

Item Type:

Article

Additional Information:

The investigation reported in this paper was funded by the Science Engineering and Research Board (SERB) Research Grant (No. SB/S3/CEE/046/2014 ) from the Department of Science and Technology (DST) , Government of India. The authors would like to gratefully acknowledge Pennar Engineered Building Systems Ltd., Hyderabad for their help in fabricating the test specimens required for experimental investigation.

Uncontrolled Keywords:

Built-up cross-section; Cold formed steel; Direct strength method; Local buckling; Long-column; Modified local slenderness; Slender cross-section

Subjects:

Civil Engineering

Divisions:

Department of Civil Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

13 Jul 2022 12:10

Last Modified:

13 Jul 2022 12:10