Analytical model for the prediction of the elastic response of curved T-stubs
Composite steel-concrete columns utilise the advantages of both materials, by combining high strength and ductility of steel with the compressive strength of the concrete. But the wide adaptation of composite structures is limited, mainly because of the lack of cheap and easy to construct connections, as many of which require costly and timeconsuming on-site welding, when circular concrete filled steel tubes (CFST) are adopted. New connections, like those incorporating the use of blind bolts and curved end-plates, may represent a valuable alternative. Such joints can be adapted to circular CFST to eliminate on-site welding, but they require the creation of new curved T-stub components. This paper proposes an analytical model for the evaluation of bolt forces in the curved T-stubs within the elastic range. The model is then validated against experimental results of joints between circular CFST columns and steel beams, with both preloaded and snug tightened bolts. Analytical model shows good agreement with experimental data, but needs further development to take into account the prying forces.
This work is licensed under a Creative Commons Attribution 4.0 International License.
European Committee for Standardization. (2005). Eurocode 3: Design of steel structures – Part 1-8: Design of joints (EN 19931-8:2005/AC:2009).
Gardner, A. P., & Goldsworthy, H. M. (1999). Moment-resisting connections for composite frames. In Proceedings of Conference on Mechanics of Structures & Materials (pp. 309–314), Rotterdam, Netherlands.
Mudrov, A., Šapalas, A., Šaučiuvėnas, G., & Urbonas, K. (2021). Moment resisting connection with curved endplates: Behaviour study. Applied Sciences, 11(4), 1520. https://doi.org/10.3390/app11041520
Oktavianus, Y., Goldsworthy, H. M., & Gad, E. F. (2014, 21–23 November). Behaviour of headed anchor blind bolts embedded in concrete filled circular hollow section column. In Australian Earthquake Engineering Society 2014 Conference, Lorne, Victoria.
Oktavianus, Y., Chang, H., Goldsworthy, H. M., & Gad, E. F. (2017). Component model for pull-out behaviour of headed anchored blind bolt within concrete filled circular hollow section. Engineering Structures, 148, 210–224. https://doi.org/10.1016/j.engstruct.2017.06.056
Wang, J. F., Han, L. H., & Uy, B. (2009). Behaviour of flush end plate joints to concrete-filled steel tubular columns. Journal of Constructional Steel Research, 65(4), 925–939. https://doi.org/10.1016/J.JCSR.2008.10.010
Wang, J., & Zhang, N. (2017). Performance of circular CFST column to steel beam joints with blind bolts. Journal of Constructional Steel Research, 130, 36–52. https://doi.org/10.1016/j.jcsr.2016.11.026
Yao, H., Goldsworthy, H., & Gad, E. (2008). Experimental and numerical investigation of the tensile behavior of blind-bolted T-stub connections to concrete-filled circular columns. Journal of Structural Engineering, 134(2), 198–208. https://doi.org/10.1061/(ASCE)0733-9445(2008)134:2(198)