Dapeng Wang, Wei Dou. Identification of Bolt Preload Loss Before and After Corrosion Based on Optical Frequency Domain Reflection Technique[J]. Laser & Optoelectronics Progress, 2025, 62(3): 0306004
- Laser & Optoelectronics Progress
- Vol. 62, Issue 3, 0306004 (2025)
Fig. 1. OFDR basic principle diagram
Fig. 2. Optical fiber paste placement diagram for equalstrength beams
Fig. 3. Theoretical strain of equal-strength beams and optical fiber mean strain fitting curve
Fig. 4. Theoretical strain of equal-strength beams under temperature stress and optical fiber mean strain fitting curve
Fig. 5. Schematic diagrams of bolt numbering, cover dimensions, and physical fiber placement
Fig. 6. Comparison between before and after cleaning of corrosion products in group Ⅲ
Fig. 7. Schematic diagrams of distributed fiber optic paste placement after corrosion in groups Ⅱ and Ⅲ
Fig. 8. Strain distribution of unilateral 4-bolt specimens of group Ⅰ
Fig. 9. Strain distribution of group Ⅰ unilateral 9-bolt specimens
Fig. 10. Group Ⅱ unilateral 4-bolt specimen loosening bolts 1-8
Fig. 11. Group Ⅰ unilateral 9-bolt specimen loosening bolts 1-9
Fig. 12. Strain distribution of graded release preload force of No. 1 bolt of group Ⅰ
Fig. 13. Strain distribution of graded release preload force of No. 4 bolt of group Ⅰ
Fig. 14. CAD software to create 3D solid units
Fig. 15. Longitudinal 4-bolt mid-span path strain distribution in group Ⅱ
Fig. 16. Longitudinal 9-bolt mid-span path strain distribution in group Ⅰ
Fig. 17. Distribution of peak unilateral 9-peg strain in group Ⅰ
Fig. 18. Distribution of peak unilateral 9-bolt strain in group Ⅱ
Fig. 19. Distribution of peak unilateral 9-bolt strain in group Ⅲ
Fig. 20. Strain distribution of graded release preload force of No. 1 bolt of group Ⅰ
Fig. 21. Strain distribution of graded release preload force of No. 4 bolt of group Ⅰ
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Table 1. Comparison of measured and theoretical strains of distributed optical fiber
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Table 2. Geometric dimensions of bolted specimens and connected steel plates
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