DOI QR코드

DOI QR Code

Retrofitted built-up steel angle members for enhancing bearing capacity of latticed towers: Experiment

  • Wang, Jian-Tao (Department of Civil Engineering, Xi'an Jiaotong University) ;
  • Wu, Xiao-Hong (School of Aerospace, Xi'an Jiaotong University) ;
  • Yang, Bin (Department of Civil Engineering, Xi'an Jiaotong University) ;
  • Sun, Qing (Department of Civil Engineering, Xi'an Jiaotong University)
  • 투고 : 2020.03.13
  • 심사 : 2021.11.07
  • 발행 : 2021.12.10

초록

Many existing transmission or communication towers designed several decades ago have undergone nonreversible performance degradation, making it hardly meet the additional requirements from upgrades in wind load design codes and extra services of electricity and communication. Therefore, a new-type non-destructive reinforcement method was proposed to reduce the on-site operation of drilling and welding for improving the quality and efficiency of reinforcement. Six built-up steel angle members were tested under compression to examine the reinforcement performance. Subsequently, the cyclic loading test was conducted on a pair of steel angle tower sub-structures to investigate the reinforcement effect, and a simplified prediction method was finally established for calculating the buckling bearing capacity of those new-type retrofitted built-up steel angles. The results indicates that: no apparent difference exists in the initial stiffness for the built-up specimens compared to the unreinforced steel angles; retrofitting the steel angles by single-bolt clamps can guarantee a relatively reasonable reinforcement effect and is suggested for the reduced additional weight and higher construction efficiency; for the substructure test, the latticed substructure retrofitted by the proposed reinforcement method significantly improves the lateral stiffness, the non-deformability and energy dissipation capacity; moreover, an apparent pinching behavior exists in the hysteretic loops, and there is no obvious yield plateau in the skeleton curves; finally, the accuracy validation result indicates that the proposed theoretical model achieves a reasonable agreement with the test results. Accordingly, this study can provide valuable references for the design and application of the non-destructive upgrading project of steel angle towers.

키워드

과제정보

This research work was financially supported by the National Natural Science Foundation of China (Grant No. 51978570, 52008228), the Project funded by China Postdoctoral Science Foundation (No. 2020M670341) and the Scientific Research Project of Shaanxi Provincial Department of Education (No. 18JK1105); their support is gratefully acknowledged. The authors are also grateful to everyone participating in this experimental program for their selfless assistance.

참고문헌

  1. Alam, M.J. and Santhakumar, A.R. (1996), "Reliability analysis and full-scale testing of transmission tower", J. Struct. Eng., 122(3), 338-344. https://doi.org/10.1061/(ASCE)0733-9445(1996)122:3(338).
  2. Albermani, F., Mahendran, M. and Kitipornchai, S. (2004), "Upgrading of transmission towers using a diaphragm bracing system", Eng. Struct., 26(6), 735-744. https://doi.org/10.1016/j.engstruct.2004.01.004.
  3. Ananthi, G., Roy, K. and Lim, J. B. (2019a), "Experimental and numerical investigations on axial strength of back-to-back built-up cold-formed steel angle columns", Steel Compos. Struct., 31(6), 601-615. https://doi.org/10.12989/scs.2019.31.6.601.
  4. Ananthi, G., Roy, K., Chen, B. and Lim, J. B. (2019b), "Testing, simulation and design of back-to-back built-up cold-formed steel unequal angle sections under axial compression", Steel Compos. Struct., 33(4), 595-614. https://doi.org/10.12989/scs.2019.33.4.595.
  5. ANSI/TIA 222-G (2005), Structural standard for antenna supporting structures and antennas, American National Standards Institute (ANSI); Arlington, USA.
  6. Ballio, G. and Mazzolani, F.M. (1983), Theory and Design of Steel Strucutres, Taylor & Francis, Oxford, Oxfordshire, England.
  7. Ban, H., Shi, G., Shi, Y. and Wang, Y. (2012), "Overall buckling behavior of 460 MPa high strength steel columns: Experimental investigation and design method", J. Constr. Steel. Res., 74, 140-150. https://doi.org/10.1016/j.jcsr.2012.02.013.
  8. Baran, E., Akis, T., Sen, G. and Draisawi, A. (2016), "Experimental and numerical analysis of a bolted connection in steel transmission towers", J. Constr. Steel. Res., 121, 253-260. https://doi.org/10.1016/j.jcsr.2016.02.009.
  9. Chen, S. (2017), Principles of Steel Structure Design, Science Press, Beijing, China.
  10. Choi, J.Y. and Kwon, Y.B. (2018), "Direct strength method for high strength steel welded section columns", Steel Compos. Struct., 29(4), 509-526. https://doi.org/10.12989/scs.2018.29.4.509.
  11. Dostanti, C. (2011), "Analysis, design and strengthening of communication towers", Ph.D. Dissertation; University of Windsor, Ontario, Canada.
  12. Fu, X., Li, H.N. and Li, G. (2016), "Fragility analysis and estimation of collapse status for transmission tower subjected to wind and rain loads", Struct. Saf., 58, 1-10. https://doi.org/10.1016/j.strusafe.2015.08.002.
  13. Gayathri, B. and Ramalingam, R. (2018), "Joint stress based deflection limits for transmission line towers", Steel Compos. Struct., 26(1), 45-53. https://doi.org/10.12989/scs.2018.26.1.045.
  14. GB 50017-2017 (2017), Standard for Design of Steel Structures, Ministry of Housing and Urban-Rural Development of the People's Republic of China (MOHURD); Architecture Industry Press of China, Beijing, China.
  15. Han, J., Zhao, X., Tang, Z., Ma, H. and Li, Z. (2017), "Study on the bearing capacity of cold-formed steel under different boundary conditions in transmission towers", Earthq. Struct., 12(6), 665-672. https://doi.org/10.12989/eas.2017.12.6.665.
  16. Johnston, B.G. (1983), "Column buckling theory: historic highlights", J. Struct. Eng., 109(9), 2086-2096. https://doi.org/10.1061/(ASCE)0733-9445(1983)109:9(2086).
  17. Kitipornchai, S. and Albermani, F.G. (2006), "Upgrading of transmission towers using tension bracing diaphragm", Proceedings of the 19th Australasian Conference on the Mechanics of Structures and Materials, Christchurch, New Zealand, November.
  18. Komatsu, H., Ishii, K. and Fukushima, A. (2009), "Experimental study on buckling strength of angle steel compression members with built-up bracing", Kou kouzou rombunshuu, 16(62), 27-34. https://doi.org/10.11273/jssc.16.62_27.
  19. Lu, C., Ma, X. and Mills, J.E. (2014), "The structural effect of bolted splices on retrofitted transmission tower angle members", J. Constr. Steel. Res., 95, 263-278. https://doi.org/10.1016/j.jcsr.2013.12.011.
  20. Lu, C., Ma, X. and Mills, J. E. (2015), "Modeling of retrofitted steel transmission towers", J. Constr. Steel. Res., 112, 138-154. https://doi.org/10.1016/j.jcsr.2015.04.005.
  21. Lu, C., Ma, X. and Mills, J.E. (2018), "Cyclic performance of bolted cruciform and splice connectors in retrofitted transmission tower legs", Thin-Wall. Struct., 122, 264-285. https://doi.org/10.1016/j.tws.2017.10.020.
  22. Meshmesha, H.M., Kennedy, J.B., Sennah, K. and Moradi, S. (2019), "Static and dynamic analysis of guyed steel lattice towers", Struct. Eng. Mech., 69(5), 567-577. https://doi.org/10.12989/sem.2019.69.5.567.
  23. Mills, J.E., Ma, X. and Zhuge, Y. (2012), "Experimental study on multi-panel retrofitted steel transmission towers", J. Constr. Steel. Res., 78, 58-67. https://doi.org/10.1016/j.jcsr.2012.06.004.
  24. Moon, B.W., Park, J.H., Lee, S.K., Kim, J., Kim, T. and Min, K. W. (2009), "Performance evaluation of a transmission tower by substructure test", J. Constr. Steel. Res., 65(1), 1-11. https://doi.org/10.1016/j.jcsr.2008.04.003.
  25. Park, J. H., Moon, B. W., Min, K. W., Lee, S. K. and Kim, C. K. (2007), "Cyclic loading test of friction-type reinforcing members upgrading wind-resistant performance of transmission towers", Eng. Struct., 29(11), 3185-3196. https://doi.org/10.1016/j.engstruct.2007.03.022.
  26. Szafran, J. and Rykaluk, K. (2016), "A full-scale experiment of a lattice telecommunication tower under breaking load", J. Constr. Steel. Res., 120, 160-175. https://doi.org/10.1016/j.jcsr.2016.01.006.
  27. Taranath, B.S. (2016), Structural Analysis and Design of Tall Buildings: Steel and Composite Construction, CRC press, Boca Raton, Florida, USA.
  28. Xie, Q. and Sun, L. (2012a), "Experimental study on the mechanical behavior and failure mechanism of a latticed steel transmission tower", J. Struct. Eng., 139(6), 1009-1018. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000722.
  29. Xie, Q. and Sun, L. (2012b), "Failure mechanism and retrofitting strategy of transmission tower structures under ice load", J. Constr. Steel. Res., 74, 26-36. https://doi.org/10.1016/j.jcsr.2012.02.003.
  30. Zhang, Y., Xu, C. and Lu, X. (2007), "Experimental study of hysteretic behaviour for concrete-filled square thin-walled steel tubular columns", J. Constr. Steel. Res., 63(3), 317-325. https://doi.org/10.1016/j.jcsr.2006.04.014.
  31. Zhuge, Y., Mills, J.E. and Ma, X. (2012), "Modelling of steel lattice tower angle legs reinforced for increased load capacity", Eng. Struct., 43, 160-168. https://doi.org/10.1016/j.engstruct.2012.05.017.