Bidirectional Behaviour of Unstiffened and Stiffened Direct-Welded Connections for Square CFST Columns

Abstract:

This paper describes finite element analyses of two-way moment frame beam-column joint subassemblies constructed using steel I-shaped beams connected to square concrete filled steel tubular (CFST) columns. These are direct-welded connections with (i) no stiffeners, (ii) internal horizontal stiffener plates, (iii) vertical tube stiffeners, and (iv) the combination of (ii) and (iii). They were analyzed under one-way and two-way column lateral loading. It is shown that internal stiffeners increase the joint stiffness and strength by up to 80% and 60% respectively. The effect of bidirectional loading on the joint capacity is found to be minor. A design method is developed to predict the required stiffener capacity. The method is applicable for both one-way and two-way loading cases.

• Periodical: Key Engineering Materials (Volume 763)
• Pages: 794-803
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.763.794
• Online since: February 2018
• Authors: Helmy Tjahjanto*, Gregory A. MacRae, Anthony Abu
• Keywords: Bidirectional Loading, Concrete Filled Steel Tube (CFST), Direct-Welded, Doubler Plates, Internal Stiffener

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