Fatigue Behavior of Integral Built-Up Box Y-Joints between Concrete-Filled Chords with Perfobond Ribs and Hollow Braces
Publication: Journal of Structural Engineering
Volume 146, Issue 3
Abstract
A novel integral built-up box Y-joint welded to rectangular hollow section braces and concrete-filled square hollow section chord stiffened by perfobond ribs was proposed and studied in fatigue. Eight specimens, including one control with a hollow chord, were tested under axial loadings in the brace. Static tests initially were conducted to estimate the hot-spot stresses in the brace–chord weld intersection and at the arc transition point of the gusset plate. Stress concentration factors (SCFs) were compared with those of the hollow chord specimen to assess the influence of concrete fill and perfobond ribs. Fatigue tests then were carried out to failure under cyclic tension force in the brace. Crack initiation locations, crack propagations, failure modes, and the corresponding fatigue data were recorded. Using test results, the design curve for the proposed joint based on hot-spot stress method was established, adopting the least-squares method considering a 95th percentile. The curves of the proposed joint and conventional welded joints without gusset plate were compared for both square and circular braces connected to square chords. Additionally, the curves were compared with those in available design guides. It was shown for the proposed joint that SCFs are significantly lower than for joints with hollow chords and its fatigue strength is much higher than other conventional joints. One design guide curve was shown to overestimate the fatigue strength of the proposed joint; however, curves from other design guides underestimated its fatigue strength.
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Acknowledgments
The authors acknowledge the National Natural Science Foundation of China (Grant Nos. 51778058 and 51378068) and the Fundamental Research Funds for the Central Universities, Chang’an University (Grant Nos. 300102219310 and 310821175015) for their financial support. In addition, the authors thank the China Scholarship Council for supporting the lead author during his research in Canada.
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Published In
Journal of Structural Engineering
Volume 146 • Issue 3 • March 2020
Copyright
©2019 American Society of Civil Engineers.
History
Received: Feb 6, 2019
Accepted: Jun 5, 2019
Published online: Dec 21, 2019
Published in print: Mar 1, 2020
Discussion open until: May 21, 2020
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