Fiber monitoring of cold-casting anchor's performance

WU Jun; ZHOU Shi-liang; SHU Yue-jie; CAO Shi-bao; ZHOU Yuan-hang

doi:10.19818/j.cnki.1671-1637.2019.06.004

Volume 19 Issue 6

Turn off MathJax

Article Contents

Article Navigation > Journal of Traffic and Transportation Engineering > 2019 > 19(6): 37-44

Next Previous

WU Jun, ZHOU Shi-liang, SHU Yue-jie, CAO Shi-bao, ZHOU Yuan-hang. Fiber monitoring of cold-casting anchor's performance[J]. Journal of Traffic and Transportation Engineering, 2019, 19(6): 37-44. doi: 10.19818/j.cnki.1671-1637.2019.06.004

Citation:

WU Jun, ZHOU Shi-liang, SHU Yue-jie, CAO Shi-bao, ZHOU Yuan-hang. Fiber monitoring of cold-casting anchor's performance[J]. Journal of Traffic and Transportation Engineering, 2019, 19(6): 37-44. doi: 10.19818/j.cnki.1671-1637.2019.06.004

Citation:

PDF( 1938 KB)

Fiber monitoring of cold-casting anchor's performance

doi: 10.19818/j.cnki.1671-1637.2019.06.004

Chongqing Southwestern Research Institute of Water Engineering, Chongqing Jiaotong University, Chongqing 400016, China

More Information

Author Bio:
WU Jun (1981-), male, associate professor, PhD, 195575462@qq.com
Received Date: 2019-05-19
Publish Date: 2019-12-25

Abstract

Abstract

To monitor the performance of cold-casting anchor, the structural stress characteristics were analyzed, and the micro unit static balancing model of steel wire in the anchor and modified epoxy filler was established. The impact of bond stress between steel wire and epoxy filler on the steel wire stress distribution characteristics was analyzed, and the failure of anchor was characterized as a singular change of bond stress. A non-destructive monitoring method of anchor's performance status by measuring the axial multi-point stress distributions of steel wires was proposed. For the LMLPES-7-211 anchor, the axial stress distribution characteristics of steel wires in the anchor were analyzed by using the finite element method. According to the non-uniform strain characteristics and harsh environment requirements, a strain-equalized DTG measurement scheme using the capillary encapsulation was proposed, and a special implantable distributed strain sensor for cold-casting anchor was developed. The simulation tests of cable anchor's performance state monitoring were carried out, two DTG distributed strain sensors were implanted into anchor 1 with normal performance and anchor 2 with abnormal performance, respectively, and then the distributed strains of steel wires under the standard stress state of anchor were monitored. Analysis result shows that the distributed strains of steel wire in the anchors 1 and 2 present a big difference. The strain attenuation trend in the anchor 1 is smoother, and the error is less than 5% compared with the finite element simulation result. The smoothness of strain attenuation trend in anchor 2 is insufficient, and the maximum error is more than 40% compared with the finite element simulation result. The performance degradation causes the bond stress of near the anchoring section to drop sharply, reaching a maximum of-2.55 MPa, and the bond stress near the anchoring section of tapping base plate increases greatly, and the increment reaches 3.25 times. Therefore, by setting the reasonable threshold of bond stress, the online monitoring and early warning of anchor's performance state can be realized.
- bridge engineering,
- performance monitoring,
- fiber distributed sensing,
- cold-casting anchor,
- bond stress,
- strain-equalized DTG

FullText(HTML)

References(28)

References

[1]	YE Jue-ming. Discussion on technical skill of high strength steel wire stay cable[J]. Metal Products, 2002, 38(2): 11-14, 23. (in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-JSZP201202004.htm
[2]	WU Yu-miao, JIANG Xiang-cheng, ZHU Li-ming. Deterioration analysis of stay cable system of cable-stayed bridge and the dealing scheme[J]. World Bridge, 2013, 41(3): 77-80, 84. (in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-GWQL201303017.htm
[3]	LIU Hai-ji. Analysis of cable disease causes and solutions of cable-stayed bidge[J]. City Building, 2013(24): 288. (in Chinese). doi: 10.3969/j.issn.1673-0232.2013.24.260
[4]	LI Quan, XI Yan, ZHAO Yi-cai, et al. Experimental study on neotype filler for stayed-cable chilled casting anchor[J]. Technology of Highway and Transport, 2011(1): 86-89. (in Chinese). doi: 10.3969/j.issn.1009-6477.2011.01.022
[5]	LU Jian-feng, LUO Yi-hong, CHEN Yi-ling, et al. Failure analysis of 650 tons tension rod of cold casting anchor[J]. Prestress Technology, 2014(2): 37-39. (in Chinese).
[6]	HAN S H, LEE W S, BANG M S. Probabilistic optimal safety with minimum life-cycle cost based on stochastic finite element analysis of steel cable-stayed bridges[J]. International Journal of Steel Structures, 2011, 11(3): 335-349. doi: 10.1007/s13296-011-3008-9
[7]	CHOI D H, PARK W S. Tension force estimation of extradosed bridge cables oscillating nonlinearly under gravity effects[J]. International Journal of Steel Structures, 2011, 11(3): 383-394. doi: 10.1007/s13296-011-3012-0
[8]	MOZOS C M, APARICIO A C. Numerical and experimental study on the interaction cable structure during the failure of a stay in a cable stayed bridge[J]. Engineering Structures, 2011, 33(8): 2330-2341. doi: 10.1016/j.engstruct.2011.04.006
[9]	BOARETTO N, CENTENO T M. Automated detection of welding defects in pipelines from radiographic images DWDI[J]. NDT and E International, 2017, 86(1): 7-13.
[10]	SHAO Jia-xin, DU Dong, CHANG Bao-hua, et al. Automatic weld defect detection based on potential defect tracking in real-time radiographic image sequence[J]. NDT and E International, 2012, 46(1): 14-21.
[11]	ZOU Yi-rong, DU Dong, CHANG Bao-hua, et al. Automatic weld defect detection method based on Kalman filtering for real-time radiographic inspection of spiral pipe[J]. NDT and E International, 2015, 72: 1-9. doi: 10.1016/j.ndteint.2015.01.002
[12]	ZHAO Yi, LI Xiao-min, LIN Lei, et al. Measurements of coating density using ultrasonic reflection coefficient phase spectrum[J]. Ultrasonics, 2011, 51(5): 596-601. doi: 10.1016/j.ultras.2010.12.015
[13]	DONG Ze-jiao, LI Sheng-long, WEN Jia-yu, et al. Real-time temperature field measurement of asphalt pavement based on fiber Bragg grating measuring technology[J]. Journal of Traffic and Transportation Engineering, 2014, 14(2): 1-6, 13. (in Chinese). doi: 10.3969/j.issn.1671-1637.2014.02.002
[14]	DENG Nian-chun, ZHOU Zhi, LONG Yue, et al. Fiber Bragg grating cold casting twist anchor cable and its application in bridges[J]. Prestress Technology, 2007(3): 3-6, 24. (in Chinese).
[15]	HO S C M, LI Wei-jie, WANG Bo, et al. A load measuring anchor plate for rock bolt using fiber optic sensor[J]. Smart Materials and Structures, 2017, 26: 1-7.
[16]	YANG Ming-hong, BAI Wei, GUO Hui-yong, et al. Huge capacity fiber-optic sensing network based on ultra-weak draw tower gratings[J]. Photonic Sensors, 2016, 6(1): 26-41. doi: 10.1007/s13320-015-0298-0
[17]	WANG Yun-miao, GONG Jian-min, WANG D Y, et al. A quasi-distributed sensing network with time-division-multiplexed fiber Bragg gratings[J]. IEEE Photonics Technology Letters, 2011, 23(2): 70-72. doi: 10.1109/LPT.2010.2089676
[18]	RAO Y J, RIBEIRO A B L, JACKSON D A, et al. Simultaneous spatial, time and wavelength division multiplexed in-fibre grating sensing network[J]. Optics Communications, 1996, 125: 53-58. doi: 10.1016/0030-4018(95)00722-9
[19]	YU Hai-hu, ZHENG Yu, GUO Hui-yong, et al. Research progress in online preparation techniques of fiber Bragg gratings on optical fiber drawing tower[J]. Functional Materials, 2014, 12(5): 12001-12005. (in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-GNCL201412001.htm
[20]	LI Jian-zhi, DU Yan-liang, LIU Chen-xi. FBG strain sensor based on online forming[J]. Optics and Precision Engineering, 2009, 17(9): 2069-2075. (in Chinese). doi: 10.3321/j.issn:1004-924X.2009.09.001
[21]	LINDNER E, CANNING J, CHOJETZKI C, et al. Post-hydrogen-loaded draw tower fiber Bragg gratings and their thermal regeneration[J]. Applied Optics, 2011, 50(17): 2519-2522. doi: 10.1364/AO.50.002519
[22]	ASLUND M L, CANNING J, STEVENSON M, et al. Thermal stabilization of type I fiber Bragg gratings for operation up to 600 degrees[J]. Optics Letters, 2010, 35(4): 586-588. doi: 10.1364/OL.35.000586
[23]	XU Ru-quan, GUO Hui-yong, LIANG Lei. Distributed fiber optic interferometric geophone system based on draw tower gratings[J]. Photonic Sensors, 2017, 7(3): 246-252. doi: 10.1007/s13320-017-0408-2
[24]	JOHNSON D. Draw-tower process creates high-quality FBG arrays[J]. Laser Focus World, 2012, 48(10): 53-56.
[25]	WU Jun, CHEN Wei-min, SHU Yue-jie, et al. Embedded strain homogenized FBG sensor for smart cables[J]. Acta Photonica Sinica, 2015, 44(7): 1-6. (in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-GZXB201507015.htm
[26]	WU Jun, CHEN Wei-min, YU Kui, et al. Strain sensing properties of grating ends packaged FBG sensors[J]. Acta Photonica Sinica, 2016, 45(2): 1-5. (in Chinese). http://www.cnki.com.cn/Article/CJFDTOTAL-GZXB201602016.htm
[27]	WANG Hua-ping, ZHOU Zhi. Advances of strain transfer analysis of optical fibre sensors[J]. Pacific Science Review, 2014, 16: 8-18.
[28]	XUE Zi-qiu, PARK H, KIYAMA T, et al. Effects of hydrostatic pressure on strain measurement with distributed optical fiber sensing system[J]. Energy Procedia, 2014: 4003-4009.

Relative Articles

Supplements(0)

Cited By

Get Citation

PDF

XML

Article Metrics

Article views (1494) PDF downloads(518)

Fiber monitoring of cold-casting anchor's performance

doi: 10.19818/j.cnki.1671-1637.2019.06.004

Abstract

References

Catalog

Article Metrics

Related

Fiber monitoring of cold-casting anchor's performance

doi: 10.19818/j.cnki.1671-1637.2019.06.004

Abstract

References

Catalog

Article Metrics

Related

Export File

Citation

Format

Content