Structures Congress 2018
Enhancing Fatigue Performance of Rib-to-Deck Joints in Orthotropic Steel Decks Using Thickened Edge U-Ribs
Publication: Structures Congress 2018: Bridges, Transportation Structures, and Nonbuilding Structures
ABSTRACT
Fatigue cracking of rib-to-deck welded joints is a critical issue compromising the service life of orthotropic steel decks (OSDs). A new thickened edge U-shaped rib (TEU) was proposed by researchers to enhance the fatigue performance for rib-to-deck joints, but few research related could be found. This study evaluated the fatigue performance of rib-to-deck welded joints in OSDs with thickened edge U-ribs (TEUs) through fatigue tests. A total of seven rib-to-deck specimens were tested, including four specimens with TEUs and three specimens with conventional U-ribs (CUs). The fatigue strength of specimens was compared using both the nominal stress and hot spot stress methods. The results were plotted against the FAT 100 and FAT 125 S-N curves. In terms of the nominal stress range, all the four data points of the TEU specimens are above the FAT 100 curve, while only one of the three data points of the CU specimens is above the FAT 100 curve. A similar trend was found in terms of the hot spot stress range with respect to FAT 125 curve. Meanwhile, the average fatigue strength of TEU specimens was 20% higher in terms of the nominal stress range and 24% higher in terms of the hot spot stress range than that of the CU specimens. Thus, the specimens with TEUs demonstrated higher fatigue strengths than those with CU. Finally, two full-scale orthotropic steel deck specimens were tested to assess the feasibility and advantages of the TEU over the CU in field applications. The fatigue life of the rib-to-deck welded joints with TEU was increased by 105% (from 4.2 M to 8.6 M cycles), proving the effectiveness of TEU in enhancing the fatigue resistance of these welded joints. Overall, the use of TEUs enhanced the fatigue strength of rib-to-deck joints. The research results have been incorporated in the relative specification in China, and the TEU has been used in several engineering projects.
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ACKNOWLEDGEMENT
This research was founded by National Natural Science Foundation of China (grant number: 51778536), Zhejiang Department of Transportation, China (grant number: 10115066) and Doctoral Innovation Fund Program of Southwest Jiaotong University.
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Published In
Structures Congress 2018: Bridges, Transportation Structures, and Nonbuilding Structures
Pages: 359 - 369
Editor: James Gregory Soules, CB&I
ISBN (Online): 978-0-7844-8133-2
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© 2018 American Society of Civil Engineers.
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Published online: Apr 17, 2018
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