Journal of Steel & Structure

Journal of Steel & Structure

Analytical Assessment of I-shaped Beam to Cylindrical Column Connections Response in Offshore Platfroms

Document Type : Original Article

Authors
Seied Ahmad Hosseini 1
Mostafa Zeinoddini 2
Taraneh Amin Taheri 1
1 Malek Ashtar University of Technology
2 K. N. Toosi University of Technology
10.22034/jss.2025.228433
Abstract
Off-shore platforms constructed for oil and gas production are prone to high potential fire risks.These probable fire incidents may cause local or global structural damages, which in turn can result in serious consequences such as causalities, destruction of the facilities, and damage to the environment. It is therefore necessary to design these structures so as to ensure the least amount of loss after a possible fire event. In this paper a closed form analytical solution for the prediction of moment-rotation and the rotational stiffness-rotation curves of I-shaped beam to cylindrical column connections, commonly used in off-shore platforms, in room and elevated temperatures is presented. The required yield and plastic moments in this model are provided as an extension to Roark's relationships. The results of this model are compared with those of a non-linear coupled mechanical-thermal finite element model previously provided by the authors, which was in turn validated using small-scale and large-scale experimental tests. Reasonable agreement has been found between the analytical model results and the experimental/numerical modeling results.
Keywords
I-shaped beam to cylindrical column
Off-shore platforms
High temperatures
Analytical model Roark's relationships
[1] Popov, E.P., and Stephen, R.M. (1970), “Cyclic loading of full-size steel connections”, Report No. UCB/EERC-70/03. Earthquake Engineering Research Centre, Univercity of California, Brekeley.
[2] Nader, M.N., and Astaneh, A. (1991), “Dynamic behavior of flexible, semirigid and rigid steel frames”, Journal of Constructional Steel Research, 18(3), pp.179-192.
[3] AISC (2022), “Specification for Structural Steel buildings”, ANSI/AISC 360-22, American Institute of Steel construction, Chicago, IL.
[4] ECCS-European Convention for Constructional Steelwork. (2015), Design of steel structures: eurocode 3: design of steel structures. John Wiley and Sons.
[5] Couchaux, M., Castiglioni, C., Hjiaj, M., and Wald, F. (2021), “I-beam-to-CHS-column moment resisting joints using passing-through plates”, Journal of Constructional Steel Research, 184, p.106703.
[6] Guo, X., Chen, S., Xu, Z., and Liu, J. (2024), “Hysteretic behavior of eccentric RHS beam-to-column joints under cyclic in-plane bending”, Journal of Constructional Steel Research, 223, p.109063.‏
[7] Piscini, A., Morelli, F., and Salvatore, W. (2021), “Experimental behavior of laser cut I-beam-to-CHS-column steel-concrete composite joints under vertical loads”, Journal of Constructional Steel Research, 181, p.106629.
[8] Ajwad, A., Di Benedetto, S., Latour, M., and Rizzano, G. (2024), “A component method approach for single-sided beam-to-column joints with CHS column and welded double-tee beam”, Thin-Walled Structures, 202, p.112055.
[9] Al Mohtar, F.M., and Hantouche, E.G. (2021), “Effect of thermal creep on the behavior of flush end-plate connection under transient conditions of fire”, Fire Safety Journal, 121, p.103268.
[10] Smith, J., and Zhang, L. (2023), “Thermal Creep Behavior of Structural Steel Connections: A Comprehensive Review. Journal of Constructional Steel Research”, doi: 10.1016/j.jcsr.2023.1087
[11] Lightfoot, E., and Le Messurier, A.P. (1974), “Elastic analysis of frameworks with elastic connections”, Journal of the Structural Division, 100(6), pp.1297-1309.
[12] Frye, M.J., and Morris, G.A. (1975), “Analysis of flexibly connected steel frames”, Canadian Journal of Civil Engineering, 2(3), pp.280-291.
[13] Krishnamurthy, N., Huang, H.T., Jeffrey, P.K., and Avery, L.K. (1979), “Analytical M-θ curves for end-plate connections”, Journal of the Structural Division, 105(1), pp.133-145.
[14] Batho C., and Lash S.D. (1936), “Further investigations on beam and stanchion connections encased in concrete, together with Lab. Investigation on a full Scale Steel Frame”, Final Report, Steel Structures Research Committee. Dept. of Scientific and Industrial Research. HMSO, London pp.92.
[15] Al-Bermani, F.G.A., Li, B., Zhu, K., and Kitipornchai, S. (1994), “Cyclic and seismic response of flexibly jointed frames”, Engineering Structures, 16(4), pp.249-255.
[16] Zhu, K., Al-Bermani, F.G.A., Kitipornchai, S., and Li, B. (1995), “Dynamic response of flexibly jointed frames”, Engineering Structures, 17(8), pp.575-580.
[17] Young, W.C., Budynas, R.G., and Roark, R.J. (2002), “Roark's formulas for stress and strain”, McGraw-hill.
[18] Hosseini, S.A., Zeinoddini, M., Saedi Daryan, A., and Rahbari, M. (2014), “Model fire tests on a beam‐to‐leg connection in an offshore platform topside”, Fire and Materials, 38(5), pp.529-549.
[19] Zeinoddini, M., and Hosseini, S.A. (2013), “Fire response of externally stiffened steel I-beam-to-CHS welded connections: A numerical modelling”, Journal of Constructional Steel Research, 89, pp.42-51.
[20] Abaqus  Analysis user's manual version 6.18-1. abaqus Inc. 2018.

  • Receive Date 04 September 2025
  • First Publish Date 04 September 2025
  • Publish Date 21 March 2025