Steel and Composite Structures

  • 제16권6호
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  • Pages.703-718
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  • 2014
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  • 1229-9367(pISSN)
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  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
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Evaluating long-term relaxation of high strength bolts considering coating on slip faying surface

  • Nah, Hwan-Seon (Smart Energy Lab., Korea Electric Power Corporation Research Institute) ;
  • Lee, Hyeon-Ju (Smart Energy Lab., Korea Electric Power Corporation Research Institute) ;
  • Choi, Sung-Mo (The University of Seoul, Department of Architectural Engineering)
  • 투고 : 2013.09.26
  • 심사 : 2014.03.31
  • 발행 : 2014.06.25
⟨ 이전 논문 다음 논문 ⟩

초록

The initial clamping forces of high strength bolts subjected to different faying surface conditions drop within 500 hours regardless of loading, any other external force or loosening of the nut. This study develops a mathematical model for relaxation confined to creep on a coated faying surface after initial clamping. The quantitative model for estimating relaxation was derived from a regression analysis for the relation between the creep strain of the coated surface and the elapsed time for 744 hours. This study establishes an expected model for estimating the relaxation of bolted joints with diverse coated surfaces. The candidate bolts are dacro-coated tension control bolts, ASTM A490 bolt, and plain tension control bolts. The test parameters were coating thickness, species of coating. As for 96, 128, 168, and $226{\mu}m$ thick inorganic zinc, when the coating thickness was increased, relaxation after the initial clamping rose to a much higher range from 10% to 18% due to creep of the coating. The amount of relaxation up to 7 days exceeded 85% of the entire relaxation. From this result, the equation for creep strain can be derived from a statistical regression analysis. Based on the acquired creep behavior, it is expected that the clamping force reflecting relaxation after the elapse of constant time can be calculated from the initial clamping force. The manufacturer's recommendation of inorganic zinc on faying surface as $75{\mu}m$, appears to be reasonable.

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과제정보

연구 과제 주관 기관 : KETEP

참고문헌

  1. Alkelani, A.A, Housari, B.A. and Nassar, S.A. (2008), "A proposed model for creep relaxation of soft gaskets in bolted joints at room temperature", ASME J. Pressure Vessel Technol., 130(1), 1-6.
  2. Architectural Institute of Japan (2003), Guidebook on Design and Fabrication of High Strength Bolted Connections, AIJ.
  3. Arimond, J. and Raymond, M.K. (1996), Bolt-Load Modeling for Composites, Machine Design, 68(22), Farmington Hills, MI, USA.
  4. ASTM F 2280-06 (2006), Twist off Type Tension Control Structural Bolt/Nut/Washer Assemblies, Steel, Heat Treated, 150 ksi Minimum Tensile Strength, ASTM International, Philadelphia, PA, USA
  5. Bickford, J.H. (2008), An Introduction to the Design and Behavior of Bolted Joints, (4th Ed.), CRC Press, New York, NJ, USA.
  6. Bickford, J.H. and Nassar, S.A. (1998), Handbook of Bolts and Bolted Joints, Marcel Dekker Inc., Madison Avenue, New York, NJ, USA.
  7. Frank, K.H. and Yura, J.A. (1981), An Experimental Study of Bolted Shear Connections, US Department of Transportation, Federal Highway Association, Washington D.C., USA.
  8. Heistermann, C. (2011), Behavior of Pretensioned Bolts in Friction Connections, Licentiate Thesis, Lulea University of Technology, Sweden.
  9. Hou, Z., Wen, S. and Chen, L. (2004), "Pre-tension relaxation of high strength bolts", 2004 Pacific Structural Steel Conference, Long Beach, CA, March.
  10. Janglinski T., Nimityongskul A., Schmitz R. and Lak, R.S. (2007), "Study of bolt load loss in bolted aluminum joints", J. Eng Mater. Tech., 129(1), 48-54. https://doi.org/10.1115/1.2400262
  11. Jo, J.B. and Seong, T.R. (2009), "Time dependent reduction of clamping forces of high strength bolt F13T", J. Korean Soc. Civil Eng., 29(4A), 291-297.
  12. Kim, J.H. and Choi, S.M. (2001), "An experimental study on the structural behavior in friction type bolted joint under cyclic loading", J. Arch. Inst. Korea, 17(1), 27-35.
  13. Kulak, G.L., Fisher, J.W. and Struik, J.H.A. (2001), Guide to Design Criteria for Bolted and Riveted Joints, (2nd Edition), American Institute of Steel Construction (AISC), Inc., Chicago, IL, USA.
  14. Nah, H.S., Lee, H.J., Kim, K.S., Kim, J.H. and Kim, W.B. (2009a), "Method for estimating the clamping force of high strength bolts subjected to temperature variation", Inter. J. Steel Struct., 9(2), 123-130. https://doi.org/10.1007/BF03249487
  15. Nah, H.S., Lee, H.J., Kim, K.S., Kim, J.H. and Kim, W.B. (2009b), "Evaluation of slip coefficient of slip critical joints with high strength bolts", Struct. Eng. Mech., 32(4), 477-488. https://doi.org/10.12989/sem.2009.32.4.477
  16. Nah, H.S., Lee, H.J., Kim, K.S., Kim, J.H. and Kim, W.B. (2010), "Evaluating relaxation of high-strength bolts by parameters on slip faying surfaces of bolted connections", Inter. J. Steel Struct., 10(3), 295-303. https://doi.org/10.1007/BF03215838
  17. Nassar, S.A. and Alkelani, A.A. (2006a), "Clamp load loss due to elastic interaction and gasket creep relaxation in bolted joints", ASME J. Pressure Vessel Technol., 128(3), 395-401.
  18. Nassar, S.A. and Alkelani, A.A. (2006b), "Effect of tightening speed on clamp load distribution in gasketed joints", SAE Special Publication SP-2033, 173-187.
  19. Polyzois, D. and Frank, K.H. (1986), "Effect of overspray and incomplete masking of faying surfaces on the slip resistance of bolted connections", Eng. J./AISC, 23(2), 65-69.
  20. RCSC Committee (2004), Specification for Structural Joints Using ASTM A325 or A490 Bolts, AISC Inc., Chicago, IL, USA.
  21. Webster, J. (1994), "Design formula to predict retained steel bolt stretch when joining A380 aluminum components at high temperature", International Off-Highway & Power Plant Congress & Exposition, SAE Technical Paper Series 941738, pp. 1-9.
  22. Yang, J. and DeWolf, J. (1999), "Mathematical model for relaxation in high strength bolted connections", J. Struct. Eng., 125(8), 803-808. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:8(803)
  23. Yang, J. and DeWolf, J. (2000), "Relaxation in high strength bolted connections using galvanized steel", J. Bridge Eng., 5(2), 99-106. https://doi.org/10.1061/(ASCE)1084-0702(2000)5:2(99)

피인용 문헌

  1. 01.30: Evaluation on clamping load of high strength bolts under ambient environment vol.1, pp.2-3, 2017, https://doi.org/10.1002/cepa.78
  2. Estimation on Clamping Force of High Strength Bolts Considering Temperature Variable of Both Site conditions and Indoor Environments vol.6, pp.3, 2015, https://doi.org/10.11004/kosacs.2015.6.3.032
  3. A Study on the Secure Plan of Clamping Force according to the Variation of Torque-Coefficient in Torque-Shear High Strength Bolts vol.5, pp.3, 2014, https://doi.org/10.11004/kosacs.2014.5.3.008
  4. Estimation on clamping load of high strength bolts considering various environment conditions vol.24, pp.4, 2014, https://doi.org/10.12989/scs.2017.24.4.399
  5. A Reduced-Order Model for Loosening of Bolted Joints Subjected to Axial Shock Excitation vol.86, pp.12, 2014, https://doi.org/10.1115/1.4044813
  6. Dynamic interactions between two axially aligned threaded joints undergoing loosening vol.520, pp.None, 2014, https://doi.org/10.1016/j.jsv.2021.116625