Yitian Xu, Jinghong Wu, Baijian Tang, Le Qi, Zhihao Meng, Pengfei Liu. Deformation Monitoring of Offshore Steel Pipe Piles Based on Weak Reflection Bragg Grating Technology[J]. Laser & Optoelectronics Progress, 2022, 59(11): 1105001
- Laser & Optoelectronics Progress
- Vol. 59, Issue 11, 1105001 (2022)
Fig. 1. Principle of weak grating sensing
Fig. 2. Steel beam section
Fig. 3. Weak grating strain sensing cable and demodulator. (a) Compact sheath weak grating strain sensing cable (type J); (b) armoured fixed-point weak grating strain sensing cable (type K); (c) cabinet dense distributed optical fiber demodulator
Fig. 4. Layout of measuring points of steel beam
Fig. 5. Bending test diagram. (a) Physical diagram; (b) schematic diagram
Fig. 6. Comparison of strain data results. (a) 800 N; (b) 1600 N; (c) 2400 N; (d) 2800 N
Fig. 7. Strain error
Fig. 8. Comparison of deflection results
Fig. 9. Deflection error
Fig. 10. Diagram of horizontal static load device
Fig. 11. Bending strain curves of pile
Fig. 12. Moment diagram of pile
Fig. 13. Pile deflection
Fig. 14. Pile deflection under different loads
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Table 1. Parameters of weak grating sensing cable
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Table 2. Strain values of midspan section
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Table 3. Deflection value of midspan section
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