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Title: Fatigue and residual strength of concrete-filled tubular X-joints with full capacity welds
Authors: Qian, X. 
Jitpairod, K.
Marshall, P. 
Swaddiwudhipong, S.
Ou, Z.
Zhang, Y.
Pradana, M.R.
Keywords: Concrete-filled sections
Fatigue crack initiation
Fatigue crack propagation
Full capacity welds
S-N curve
Tubular joint
Issue Date: 2014
Citation: Qian, X., Jitpairod, K., Marshall, P., Swaddiwudhipong, S., Ou, Z., Zhang, Y., Pradana, M.R. (2014). Fatigue and residual strength of concrete-filled tubular X-joints with full capacity welds. Journal of Constructional Steel Research 100 : 21-35. ScholarBank@NUS Repository.
Abstract: This paper presents the experimental findings on the fatigue performance and residual strength of the circular hollow section X-joints with a concrete-filled chord. The welding profile along the brace-to-chord intersection employs a recently proposed set of welding details, namely the full capacity tubular joint welds. The experimental investigation focuses on: 1) the stress concentration comparison corresponding to different stages of the specimen preparation, 2) the fatigue crack initiation life and propagation life; and 3) the comparison of the measured fatigue life with respect to the design S-N curves. The experimental measurement reveals that the fatigue crack propagation life contributes to a significant portion of the total fatigue life for both the hollow section tubular joints and the concrete-filled tubular joints. The total fatigue life of the test specimens complies with the life estimation based on the existing design S-N curves, originally developed for tubular joints fabricated using the complete joint penetration welds. The residual strength of the fatigue-cracked tubular joints follows approximately a linear relationship with respect to the percentage of the crack area along the brace-to-chord intersection. © 2014 Elsevier Ltd.
Source Title: Journal of Constructional Steel Research
ISSN: 0143974X
DOI: 10.1016/j.jcsr.2014.04.021
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