Deformation Monitoring of Offshore Steel Pipe Piles Based on Weak Reflection Bragg Grating Technology

Yitian Xu; Jinghong Wu; Baijian Tang; Le Qi; Zhihao Meng; Pengfei Liu

doi:10.3788/LOP202259.1105001

Laser & Optoelectronics Progress, Volume. 59, Issue 11, 1105001(2022)

Deformation Monitoring of Offshore Steel Pipe Piles Based on Weak Reflection Bragg Grating Technology

Yitian Xu¹, Jinghong Wu^1、*, Baijian Tang¹, Le Qi², Zhihao Meng², and Pengfei Liu³

Author Affiliations

¹School of Civil Engineering,Suzhou University of Science and Technology, Suzhou 215011, Jiangsu , China

²Shandong Electric Power Engineering Consulting Institue Co., Ltd., Jinan 250013, Shandong , China

³Suzhou NanZee Sensing Technology Co., Ltd., Suzhou 215123, Jiangsu , China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(17)

Fig. 1. Principle of weak grating sensing

Download full size

Fig. 2. Steel beam section

Download full size

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

Download full size

Fig. 4. Layout of measuring points of steel beam

Download full size

Fig. 5. Bending test diagram. (a) Physical diagram; (b) schematic diagram

Download full size

Fig. 6. Comparison of strain data results. (a) 800 N; (b) 1600 N; (c) 2400 N; (d) 2800 N

Download full size

Fig. 7. Strain error

Download full size

Fig. 8. Comparison of deflection results

Download full size

Fig. 9. Deflection error

Download full size

Fig. 10. Diagram of horizontal static load device

Download full size

Fig. 11. Bending strain curves of pile

Download full size

Fig. 12. Moment diagram of pile

Download full size

Fig. 13. Pile deflection

Download full size

Fig. 14. Pile deflection under different loads

Download full size

Table 1. Parameters of weak grating sensing cable
View table
Table 1. Parameters of weak grating sensing cable
Number Number of cores Central wavelength of grating /nm Reflectivity /% Strain test range /με Diameter /mm Fixed-point spacing /m
Type J 1 1527-1568 0.01 15000 2.0 ≥0.5
Type K 1 1527-1568 0.01 15000 2.5 ≥0.5

Table 2. Strain values of midspan section

View table

Table 2. Strain values of midspan section

Load /N	Midspan measuring point /με				Error /%
Load /N	1-1'	5-5'	3-3'	Theoretical value	1-1'&3-3'	5-5'&3-3'
400	-39.34	-37.61	-45.24	-40.08	13.05	16.88
800	-86.56	-84.50	-85.86	-80.16	0.81	1.58
1200	-125.63	-125.06	-128.01	-120.25	1.86	2.31
1600	-169.15	-167.32	-169.14	-160.33	0.00	1.08
2000	-212.27	-211.37	-212.33	-200.41	0.03	0.45
2400	-258.32	-250.78	-255.51	-240.49	1.10	1.85
2800	-302.53	-294.34	-296.64	-280.57	1.98	0.78

Table 3. Deflection value of midspan section

View table

Table 3. Deflection value of midspan section

Load /N	Midspan measuring point /mm					Error /%
Load /N	Type J	Type K	3-3'	Theoretical value	Measured value	Type J and measured values	Type K and measured values
400	-2.017	-2.034	-2.319	-2.004	-2.527	20.198	19.516
800	-4.334	-4.332	-4.363	-4.008	-4.724	8.266	8.296
1200	-6.481	-6.462	-6.447	-6.012	-6.982	7.177	7.446
1600	-8.549	-8.693	-8.535	-8.016	-9.248	7.557	6.004
2000	-10.972	-10.999	-10.664	-10.020	-11.222	2.232	1.985
2400	-13.049	-13.030	-12.774	-12.025	-13.526	3.530	3.669
2800	-15.142	-15.164	-14.832	-14.029	-15.754	3.883	3.745

Tools

Get Citation

Copy Citation Text

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

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites