DOI QR코드

DOI QR Code

Axially-loaded multiplanar tubular KTX-joints: numerical analysis

  • Zhang, Chenhui (School of Civil Engineering, Qingdao University of Technology) ;
  • Zou, Bo (College of Civil Engineering, Tongji University) ;
  • Yang, Guotao (School of Civil Engineering, Qingdao University of Technology)
  • 투고 : 2020.10.16
  • 심사 : 2022.01.02
  • 발행 : 2022.01.25

초록

With the development of spatial structures, the joints are becoming more and more complex to connect tubular members of spatial structures. In this study, an approach is proposed to establish high-efficiency finite element model of multiplanar KTX-joint with the weld geometries accurately simulated. Ultimate bearing capacity the KTX-joint is determined by the criterion of deformation limit and failure mechanism of chord wall buckling is studied. Size effect of fillet weld on the joint ultimate bearing capacity is preliminarily investigated. Based on the validated finite element model, a parametric study is performed to investigate the effects of geometric and loading parameters of KT-plane brace members on ultimate bearing capacity of the KTX-joint. The effect mechanism is revealed and several design suggestions are proposed. Several simple reinforcement methods are adopted to constrain the chord wall buckling. It is concluded that the finite element model established by proposed approach is capable of simulating static behaviors of multiplanar KTX-joint; chord wall buckling with large indentation is the typical failure mode of multiplanar KTX-joint, which also increases chord wall displacements in the axis directions of brace members in orthogonal plane; ultimate bearing capacity of the KTX-joint increases approximately linearly with the increase of fillet weld size within the allowed range; the effect mechanism of geometric and loading parameters are revealed by the assumption of restraint region and interaction between adjacent KT-plane brace members; relatively large diameter ratio, small overlapping ratio and small included angle are suggested for the KTX-joint to achieve larger ultimate bearing capacity; the adopted simple reinforcement methods can effectively constrain the chord wall buckling with the design of KTX-joint converted into design of uniplanar KT-joint.

키워드

과제정보

The research is sponsored by the National Natural Science Foundation of China (Nos. 51808308, 51978351), State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University, China (No. SLDRCE17-02) and Postdoctoral Science Foundation of China (No. 2020M682137).

참고문헌

  1. Ahmadi, H. and Lotfollahi-Yaghin, M.A. (2012), "Geometrically parametric study of central brace SCFs in offshore three-planar tubular KT-joints", J. Construct. Steel Res., 71, 149-161. https://doi.org/10.1016/j.jcsr.2011.10.024.
  2. Chen, Y. and Zhao, X.Z. (2011), "Finite element parametric analysis and design equation of bearing capacity for unstiffened uniplanar overlapped CHS KT-joints", J. Build. Struct., 32(4), 134-141. https://doi.org/10.14006/j.jzjgxb.2011.04.016.
  3. Chen, Y., Feng, R. and Wang, C. (2015), "Tests of steel and composite CHS X-joints with curved chord under axial compression", Eng. Struct., 99, 423-438. https://doi.org/10.1016/j.engstruct.2015.05.011.
  4. Chiew, S.P., Soh, C.K., Fung, T.C. and Soh, A.K. (1999), "Numerical study of multiplanar tubular DX-joints subject to axial loads", Comput. Strcut., 72(6), 749-761. https://doi.org/10.1016/S0045-7949(98)00217-X.
  5. Chiew, S.P., Zhang, J.C., Shao, Y.B. and Qiu, Z.H. (2012), "Experimental and numerical analysis of complex welded tubular DKYY-joints", Adv. Struct. Eng., 15(9), 1573-1582. https://doi.org/10.1260/1369-4332.15.9.1573.
  6. Choo, Y.S., Van der Vegte, G.J., Zettlemoyer, N., Li, B.H. and Liew, J.Y.R. (2005), "Static strength of T-joints reinforced with doubler or collar plates. I: Experimental investigations", J. Struct. Eng., 131(1), 119-128. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:1(119).
  7. Dexter, E.M. and Lee, M.M.K. (1999), "Static strength of axially loaded tubular K-joints. II: Ultimate capacity", J. Struct. Eng., 125(2), 202-210. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:2(202).
  8. GB50017 (2017), Standard for Design of Steel structures, Ministry of Housing and Urban-Rural Development of the People's Republic of China, Beijing, China.
  9. Han, Q., Lu, Y., Yu, B. and Yin, Y. (2010), "Ultimate load capacity and reinforcement of circular-hollow-section N-joint", Transactions Tianjin Univ., 16(1), 1-5. https://doi.org/10.1007/s12209-010-0001-x.
  10. Hibbitt, H., Karlsson, B. and Sorensen, P. (2012), Abaqus Analysis User's Manual (version 6.12), Dassault Systemes Simulia Corp., Providence, RI, U.S.A.
  11. Kurobane, Y., Makino, Y. and Ochi, K. (1984), "Ultimate resistance of unstiffened tubular joints", J. Struct. Eng., 110(2), 385-400. https://doi.org/10.1061/(ASCE)0733-9445(1984)110:2(385).
  12. Lee, C.H., Kim, S.H., Chung, D.H., Kim, D.K. and Kim, J.W. (2017), "Experimental and numerical study of cold-formed high-strength steel CHS X-joints", J. Struct. Eng., 143(8), 04017077. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001806.
  13. Lee, M.M.K. and Llewelyn-Parry, A. (2004), "Offshore tubular Tjoints reinforced with internal plain annular ring stiffeners", J. Struct. Eng., 130(6), 942-951. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:6(942).
  14. Lee, M.M.K. and Wilmshurst, S.R. (1996), "Parametric study of strength of tubular multiplanar KK-joints", J. Struct. Eng., 122(8), 893-904. https://doi.org/10.1061/(ASCE)0733-9445(1996)122:8(893).
  15. Lu, L.H., De Winkel, G.D., Yu, Y. and Wardenier, J. (1994), "Deformation limit for the ultimate strength of hollow section joints", Proceedings of the 6th International Symposium on Tubular Structures, Rotterdam, The Netherlands, December.
  16. Paul, J.C., Makino, Y. and Kurobane, Y. (1993), "Ultimate resistance of tubular double T-joints under axial brace loading", J. Construct. Steel Res., 24(3), 205-228. https://doi.org/10.1016/0143-974X(93)90044-S.
  17. Shao, Y.B., Wang, Y.M. and Yang, D.P. (2016), "Hysteretic behaviour of circular tubular T-joints with local chord reinforcement", Steel Compos. Struct., 21(5), 1017-1029. http://dx.doi.org/10.12989/scs.2016.21.5.1017.
  18. Sharaf, T. and Fam, A. (2013), "Finite element analysis of beam-column T-joints of rectangular hollow steel sections strengthened using through-wall bolts", Thin Walled Struct, 64, 31-40. https://doi.org/10.1016/j.tws.2012.12.002.
  19. Shen, W., Choo, Y.S., Wardenier, J., Packer, J.A. and Van Der Vegte, G.J. (2013), "Static strength of axially loaded EHS X-joints with braces welded to the narrow sides of the chord", J. Construct. Steel Res., 88, 181-190. https://doi.org/10.1016/j.jcsr.2013.05.012.
  20. Soh, C.K., Chan, T.K. and Yu, S.K. (2000), "Limit analysis of ultimate strength of tubular X-joints", J. Strcut. Eng., 126(7), 790-797. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:7(790).
  21. Spiegel, L. and Limbrunner, G.F. (2005), Applied Structural Steel Design. Tsinghua University Press, Beijing, China.
  22. van der Vegte, G.J. (1995), The Static Strength of Uniplanar and Multiplanar Tubular T-and X-joints, Ph.D. Dissertation, Delft University of Technology, Delft.
  23. Van der Vegte, G.J. and Wardenier, J. (1998), "The static strength of multiplanar tubular TX-joints under axial loading excluding the effects of overall chord bending moments", J. Construct. Steel Res., 47(1-2), 141-168. https://doi.org/10.1016/S0143-974X(98)80106-5.
  24. van der Vegte, G.J., Choo, Y.S., Liang, J.X., Zettlemoyer, N. and Liew, J.Y.R. (2005), "Static strength of T-joints reinforced with doubler or collar plates. II: Numerical simulations", J. Struct. Eng., 131(1), 129-38. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:1(129).
  25. Wardenier, J., Kurobane, Y., Packer, J.A., Van der Vegte, G.J. and Zhao, X.L. (2008), Design Guide for Circular Hollow Section (CHS) Joints Under Predominantly Static Loading, CIDECT.
  26. Wardenier, J., Packer, J.A., Zhao, X.L. and Van der Vegte, G.J. (2010), Hollow Sections in Structural Applications, Bouwen met Staal, Zoetermeer, The Netherlands.
  27. Yang, K., Zhu, L., Bai, Y., Sun, H. and Wang, M. (2018), "Strength of external-ring-stiffened tubular X-joints subjected to brace axial compressive loading", Thin Wall. Struct., 133, 17-26. https://doi.org/10.1016/j.tws.2018.09.030.
  28. Zhao S.D. (2014), Research on Optimization Design of Long Span Rib-Patterned Reticulated Shell Structures, Master's Theis, Tongji University, Shanghai.
  29. Zhao, X.L. (2000), "Deformation limit and ultimate strength of welded T-joints in cold-formed RHS sections", J. Construct. Steel Res., 53(2), 149-165. https://doi.org/10.1016/S0143-974X(99)00063-2.
  30. Zhao, X.Z., Chen, Y., Chen, Y.Y., Xu, X.B. and Xu, L.X. (2010), "Experimental study on static behavior of overlapped CHS KT-joints", Ind. Construct., 40(4), 107-111. https://doi.org/10.13204/j.gyjz2010.04.030.
  31. Zhao, X., Qiu, S., Hu, K., Sivakumaran, K.S. and Chen, Y. (2019), "Capacity of multi-planar out-of-plane overlapped tubular KK-joints having different joint details", J. Construct. Steel Res., 158, 182-200. https://doi.org/10.1016/j.jcsr.2019.03.023.
  32. Zhu, L., Zhao, Y., Li, S., Huang, Y. and Ban, L. (2014), "Numerical analysis of the axial strength of CHS T-joints reinforced with external stiffeners", Thin Wall Struct., 85, 481-488. https://doi.org/10.1016/j.tws.2014.09.018.
  33. Zou, B. (2015), Full-Scale Tests and Finite Element Analysis of Complex Spatial Multi-Planar Joints of Circular Steel Tubular Structures, Master's Theis, Tongji University, Shanghai.