On-site Fe-SMA strengthening of floorbeam cutout cracks in steel bridge deck

Multiple actual bridges have found various fatigue cracks originating from the edge of arc-shaped floorbeam (FB) cutouts in orthotropic steel bridge deck (OSD). Therefore, it is of great benefit to develop an effective reinforcement method to repair such cracks. In this work, a novel iron-based shape memory alloy (Fe-SMA) strengthening technique on cutout cracks was proposed and practically employed to the OSD of a cable-stayed steel bridge in China. Based on crack inspection in the field, stress behaviors at the cracked FB cutouts were studied through field measurement. Then the effects of drilling stop-hole and bonding Fe-SMA on the stress response under the passing vehicles were investigated. Furthermore, the fatigue performances around cutout details before and after reinforcement were also evaluated based on stress-life approach. The results show that the stress concentration position shifts from the crack tip to the stop-hole edge after drilling, and the hole edge still exhibits high stress response and severe stress concentration under wheel load. Further bonding Fe-SMA plates on the basis of stop-hole can provide better reinforcement effect. Compared to the traditional stop-hole method, the attachment of Fe-SMA plates on the cracked FB cutouts performed well in reducing the local fatigue stress ranges at the hole edge. The retrofitted cutout was expected to endure an infinite number of cycles without failure since all stress ranges fell below the constant amplitude fatigue limit (CAFL), in case of the integrity of the strengthening system. Furthermore, thermally activated Fe-SMA can provide beneficial compressive stresses at the hole edge to prevent crack initiation, which facilitates to extend the service life of the cracked cutout detail. In summary, it is recommended to repair the cutout cracks in FB web by combining the bonded Fe-SMA plates with stop-hole method as soon as the cracks are found.

• Record URL:
  • https://doi.org/10.1016/j.engstruct.2024.118607
• Record URL:
  • http://www.sciencedirect.com/science/article/pii/S0141029624011696
• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/01410296
• Supplemental Notes:
  • © 2024 Elsevier Ltd. All rights are reserved, including those for text and data mining, AI training, and similar technologies. Abstract reprinted with permission of Elsevier.
• Authors:
  • Lyu, Zhilin
  • Jiang, Xu
  • Qiang, Xuhong
  • Xu, Zhimin
  • Wang, Jinquan
• Publication Date: 2024-10-1

Language

• English

Media Info

• Media Type: Web
• Features: References;
• Pagination: 118607
• Serial:
  • Engineering Structures
  • Volume: 316
  • Issue Number: 0
  • Publisher: Elsevier
  • ISSN: 0141-0296
  • Serial URL: http://www.sciencedirect.com/science/journal/01410296

Subject/Index Terms

• TRT Terms: Bridge decks; Cable stayed bridges; Fatigue cracking; Iron alloys; Steel bridges; Structural strengthening
• Geographic Terms: China
• Subject Areas: Bridges and other structures; Highways; Maintenance and Preservation;

Filing Info

• Accession Number: 01928868
• Record Type: Publication
• Files: TRIS
• Created Date: Aug 27 2024 9:40AM