Steel and Composite Structures

  • 제21권6호
  • /
  • Pages.1227-1250
  • /
  • 2016
  • /
  • 1229-9367(pISSN)
  • /
  • 1598-6233(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Investigation on SCFs of concrete-filled circular chord and square braces K-joints under balanced axial loading

  • Chen, Yu (School of Urban Construction, Yangtze University) ;
  • Hu, Kang (School of Urban Construction, Yangtze University) ;
  • Yang, Jian (School of Urban Construction, Yangtze University)
  • 투고 : 2016.03.03
  • 심사 : 2016.08.03
  • 발행 : 2016.08.30
⟨ 이전 논문 다음 논문 ⟩

초록

Most of the research work has been conducted on K-joints under static loading. Very limited information is available in consideration of fatigue strength of K-joints with concrete-filled chord. This paper aims to describe experimental and numerical investigations on stress concentration factors (SCFs) of concrete-filled circular chord and square braces K-joints under balanced axial loading. Experiment was conducted to study the hot spot stress distribution along the intersection of chord and braces in the two specimens with compacting concrete filled in the chord. The test results of stress distribution curves of two specimens were reported. SCFs of concrete-filled circular chord and square braces K-joints were lower than those of corresponding hollow circular chord and square brace K-joints. The corresponding finite element analysis was also conducted to simulate stress distribution along the brace and chord intersection region of joints. It was achieved that experimental and finite element analysis results had good agreement. Therefore, an extensive parametric study was carried out by using the calibrated finite element model to evaluate the effects of main geometric parameters and concrete strength on the behavior of concrete-filled circular chord and square braces K-joints under balanced axial loading. The SCFs at the hot spot locations obtained from ABAQUS were compared with those calculated by using design formula given in the CIDECT for hollow SHS-SHS K-joints. CIDECT Design Guide was generally quite conservative for predicting SCFs of braces and was dangerous for predicting SCFs of chord in concrete-filled circular chord and square braces K-joints. Finally SCF formulae were proposed for circular chord and square braces K-joints with concrete-filled in the chord under balanced axial loading. It is shown that the SCFs calculated from the proposed design equation are generally in agreement with the values derived from finite element analysis, which were proved to be reliable and accurate.

키워드

과제정보

연구 과제 주관 기관 : National Natural Science Foundation of China

참고문헌

  1. Ahmadi, H. (2016), "A probability distribution model for SCFs in internally ring-stiffened tubular KT-joints of offshore structures subjected to out-of-plane bending loads", Ocean Eng., 116, 184-199. https://doi.org/10.1016/j.oceaneng.2016.02.037
  2. Ahmadi, H., Lotfollahi-Yaghin, M.A. and Aminfar, M.H. (2011), "Effect of stress concentration factors on the structural integrity assessment of multi-planar offshore tubular DKT-joints based on the fracture mechanics fatigue reliability approach", Ocean Eng., 38(17-18), 1883-1893. https://doi.org/10.1016/j.oceaneng.2011.08.004
  3. Ahmadi, H., Lotfollahi-Yaghin, M.A. and Aminfar, M.H. (2012), "The development of fatigue design formulas for the outer brace SCFs in offshore three-planar tubular KT-joints", Thin-Wall. Struct., 58, 67-78. https://doi.org/10.1016/j.tws.2012.04.011
  4. Ahmadi, H. and Lotfollahi-Yaghin, M.A. (2013), "Effect of SCFs on S-N based fatigue reliability of multiplanar tubular DKT-joints of offshore jacket-type structures", Ships Offshore Struct., 8(1), 55-72. https://doi.org/10.1080/17445302.2011.627750
  5. Ahmadi, H., Ali Lotfollahi-Yaghin, M.A. and Shao, Y.B. (2013), "Chord-side SCF distribution of central brace in internally ring-stiffened tubular KT-joints: A geometrically parametric study", Thin-Wall. Struct., 70, 93-105. https://doi.org/10.1016/j.tws.2013.04.011
  6. Cao, Y.G., Meng, Z.B., Zhang, S.H. and Tian, H.Q. (2013), "FEM study on the stress concentration factors of K-joints with welding residual stress", Appl. Ocean Res., 43, 195-205. https://doi.org/10.1016/j.apor.2013.09.006
  7. Chen, J., Chen, J. and Jin, W.L. (2010), "Experiment investigation of stress concentration factor of concretefilled tubular T-joints", J. Construct. Steel Res., 66(12), 1510-1515. https://doi.org/10.1016/j.jcsr.2010.06.004
  8. Cheng, B., Qian, Q. and Zhao, X.L. (2015), "Numerical investigation on stress concentration factors of square bird-beak SHS T-joints subject to axial forces", Thin-Wall. Struct., 94, 435-445. https://doi.org/10.1016/j.tws.2015.05.003
  9. Chinese Standard (2006), Code for carbon structure steel; GB/T700-2006, China Standards Press, Beijing, China. [In Chinese]
  10. Chinese Standard (2002), Technical specification for welding of steel structure of building; JGJ 81-2002, China Standards Press, Beijing, China. [In Chinese]
  11. Darren, G. and Mallery, P. (2013), SPSS for Windows Step by Step; A Simple Guide and Reference, 11.0 Update.
  12. Diaye, A.N., Hariri, S., Pluvinage, G. and Azari, Z. (2007), "Stress concentration factor analysis for notched welded tubular T-joints", Int. J. Fatigue, 29(8), 1554-1570. https://doi.org/10.1016/j.ijfatigue.2006.10.030
  13. Eurocode 3 (EC3) (2005), Design of Steel Structures-Part 1-8: Design of Joints, European Committee for Standardization, EN 1993-1-8, CEN, Brussels, Belgium.
  14. Gao, F., Shao, Y.B. and Gho, W.M. (2007), "Stress and strain concentration factors of completely overlapped tubular joints under lap brace IPB load", J. Construct. Steel Res., 63(3), 305-316. https://doi.org/10.1016/j.jcsr.2006.05.007
  15. Lee, C.K., Chiew, S.P., Lie, S.T. and Nguyen, T.B.N. (2009a), "Fatigue study of partially overlapped circular hollow section K-joints. Part 1: Geometrical models and mesh generation", Eng. Fract. Mech., 76(16), 2445-2463. https://doi.org/10.1016/j.engfracmech.2009.08.006
  16. Lee, C.K., Chiew, S.P., Lie, S.T. and Nguyen, T.B.N. (2009b), "Fatigue study of partially overlapped circular hollow section K-joints. Part 2: Experimental study and validation of numerical models generation", Eng. Fract. Mech., 76(15), 2408-2428. https://doi.org/10.1016/j.engfracmech.2009.08.005
  17. Liu, H.Q., Shao, Y.B., Lu, N. and Wang, Q.L. (2015), "Hysteresis of concrete-filled circular tubular (CFCT) T-joints under axial load", Steel Compos. Struct., Int. J., 18(3), 739-756. https://doi.org/10.12989/scs.2015.18.3.739
  18. Pang, N.L., Zhao, X.L., Mashiri, F.R. and Dayawansa, P. (2009), "Full-size testing to determine stress concentration factors of dragline tubular joints", Eng. Struct., 31(1), 43-56. https://doi.org/10.1016/j.engstruct.2008.07.014
  19. Ran, F. and Young, B. (2013), "Stress concentration factors of cold-formed stainless steel tubular X-joints", J. Construct. Steel Res., 91, 26-41. https://doi.org/10.1016/j.jcsr.2013.08.012
  20. Shao, Y.B. (2006), "Analysis of stress intensity factor (SIF) for cracked tubular K-joints subjected to balanced axial load", Eng. Fail. Anal., 13(1), 44-64. https://doi.org/10.1016/j.engfailanal.2004.12.031
  21. SPSS Inc. (1983), SPSS/PC: for the IBM PC/XT.
  22. Tong, L.W., Sun, C.Q., Chen, Y.Y., Zhao, X.L., Shen, B. and Liu, C.B. (2008), "Experimental comparison in hot spot stress between CFCHS and CHS K-joints with gap", Tubular Structures XII, (Z.Y. Shen, Y.Y. Chen, X.Z. Zhao Editors), Taylor & Francis, London, UK, pp. 389-395.
  23. Wang, K., Tong, L.W., Zhu, J., Zhao, X.L. and Mashiri, F.R. (2013), "Fatigue behavior of welded T-joints with a CHS brace and CFCHS chord under axial loading in the brace", J. Bridge Eng., 18(2), 142-152. https://doi.org/10.1061/(ASCE)BE.1943-5592.0000331
  24. Yang, J., Chen, Y. and Hu, K. (2015), "Stress concentration factors of negative large eccentricity tubular Njoints under axial compressive loading in vertical brace", Thin-Wall. Struct., 96, 359-371. https://doi.org/10.1016/j.tws.2015.08.027
  25. Zhao, X.L., Herion, S., Packer, J.A., Puthli, R.S., Sedlacek, G., Wardenier, J., Weynand, K., Wingerde, A.M. and Yeomans, N.F. (2001), Design guide for circular and rectangular hollow section welded joints under fatigue loading; CIDECT Design Guide No.8, TUV-Verlag, Cologne, Germany.

피인용 문헌

  1. Fatigue behavior and design of welded tubular T-joints with CHS brace and concrete-filled chord vol.120, 2017, https://doi.org/10.1016/j.tws.2017.08.024