Volume 22 Issue 6
Dec.  2022
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BU Yi-zhi, AN Lang, CUI Chuang, HU Ji-dan, ZHANG Qing-hua, ZHU Jin-zhu. A Fe-SMA-based fabricated active reinforcement method for fatigue cracks in steel bridge decks[J]. Journal of Traffic and Transportation Engineering, 2022, 22(6): 84-94. doi: 10.19818/j.cnki.1671-1637.2022.06.005
Citation: BU Yi-zhi, AN Lang, CUI Chuang, HU Ji-dan, ZHANG Qing-hua, ZHU Jin-zhu. A Fe-SMA-based fabricated active reinforcement method for fatigue cracks in steel bridge decks[J]. Journal of Traffic and Transportation Engineering, 2022, 22(6): 84-94. doi: 10.19818/j.cnki.1671-1637.2022.06.005
shu

A Fe-SMA-based fabricated active reinforcement method for fatigue cracks in steel bridge decks

doi: 10.19818/j.cnki.1671-1637.2022.06.005
  • 1.

    School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    CCCC Second Harbor Engineering Co., Ltd., Wuhan 430040, Hubei, China

Funds:

National Natural Science Foundation of China 51878561

National Natural Science Foundation of China 51978579

National Natural Science Foundation of China 52108176

Open Projects of State Key Laboratory for Health and Safety of Bridge Structures BHSKL19-06-KF

Transportation Science and Technology Project of Sichuan Province 2019-ZL-12

Science and Technology Project of Sichuan Province 2021YJ0037

More Information
  • Author Bio:

    BU Yi-zhi(1961-), male, professor, PhD, yizhibu@163.com

    CUI Chuang(1989-), male, associate professor, PhD, ccui@swjtu.edu.cn

  • Received Date: 2022-06-15
  • Publish Date: 2022-12-25
    Abstract
  • A new fabricated active reinforcement method for fatigue cracks in steel bridge decks based on iron-based shape memory alloy (Fe-SMA) was proposed to achieve the rapid reinforcement of the steel bridge decks. The safety and reliability of the reinforcement system were verified by the calculation results of the finite-element refined double-sided reinforcement model and the observation of the preliminary activating and loading test. On this basis, the fatigue cracks in the U-rib butt weld were taken as the research object, the linear elastic fracture mechanics was involved, the stress and cracking characteristics of the fatigue details were considered, the amplitude of the stress intensity factor of mode-Ⅰ cracks at the tips of surface and internal cracks under cyclic loading was used to evaluate the reinforcement effect of the reinforcement system, and the specific reinforcement schemes for cracks with different lengths were determined. Analysis research results show that the amplitude of the stress intensity factor of the crack tips can be reduced to below the propagation threshold by the Fe-SMA-based active reinforcement method for fatigue cracks in steel bridge decks, and can effectively restrain the further propagation of fatigue cracks. The non-penetrating fatigue cracks shorter than 50 mm can be reinforced by the Fe-SMA with a width of 60 mm, and the stress intensity factor of the points of concern at the crack tips reduces by more than 90%. The 50-120 mm long penetrating fatigue cracks can be reinforced by the Fe-SMA with a width of 120 mm. The fatigue cracks with a length of 120-350 mm need to be reinforced simultaneously by bottom plates and webs. The desired crack-arresting state is achieved invariably. 2 tabs, 19 figs, 30 refs.

     

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