Strength Calculation of Short Concrete-filled Steel Tube Columns
Tóm tắt
The aim of this work is to propose a technique to calculate the strength of short concrete-filled steel tube columns under the short-term action of a compressive load, based on the phenomenological approach and the theoretical positions of reinforced concrete mechanics. The main dependencies that allow the realization of the deformation calculation model in practice are considered. A distinctive feature of the proposed approach is the method of the multipoint construction of deformation diagrams for a concrete core and steel shell. In this case, two main factors are taken into account. First, the steel shell and the concrete core work under conditions of a complex stress state. Since the proposed dependencies to determine the strength and the ultimate relative strain of volumetrically compressed concrete are obtained phenomenologically, they are more versatile than the commonly used empirical formulas. In particular, they can be used for self-stressing, fine-grained and other types of concrete. Second, with a step-by-step increase in the relative deformation, the lateral pressure on a concrete core and a steel shell constantly change. Thus, the parametric points of the concrete and steel deformation diagrams also change at each step. This circumstance was not taken into account in earlier calculations. A comparison of the theoretical and experimental results indicates that the practical application of the developed calculation procedure gives a reliable and fairly stable estimate of the stress–strain state and the strength of concrete-filled steel tube columns.
Tài liệu tham khảo
CR 266.1325800.2016. (2016). Composite steel and concrete structures. In Design rules. Ministry of Construction, Housing and Utilities of the Russian Federation.
De Oliveira, W. L. A., De Nardin, S., Debs, De Cresce El, de Cresce El, A. L., & El Debs, M. K. (2009). Influence of concrete strength and length/diameter on the axial capacity of CFT columns. Journal of Constructional Steel Research, 65(12), 2103–2110. https://doi.org/10.1016/j.jcsr.2009.07.004.
Dundu, M. (2012). Compressive strength of circular concrete filled steel tube columns. Thin-Walled Structures, 56, 62–70.
EN 1992-1-1. (2004). Eurocode 2: Design of concrete structures. Brussels: European Committee for Standardization.
EN 1994-1-1. (2004). Eurocode 4: Design of composite steel and concrete structures. Brussels: European Committee for Standardization.
Fattah, A. M. (2012). Behaviour of concrete columns under various confinement effects. Dissertation, USA, Kanzas: Kanzas State University.
Fonov, V. M., Lyudkovsky, I. G., & Nesterovich, A. P. (1989). The strength and the deformability of pipe-concrete elements under axial compression. Concrete and reinforced concrete, 1, 4–6.
Fujimoto, T., Mukai, A., Nishiyama, I., & Sakino, K. (2004). Behavior of eccentrically loaded concrete-filled steel tubular columns. Journal of Structural Engineering, 130, 203–212.
Furlong, R. W. (1967). Strength of steel encased concrete beam-columns. Journal of the Structural Division, 93(5), 115–130.
Han, L. H. (2007). Concrete filled steel tubular structures (2nd ed.). Beijing: China Science Press.
Hu, H. T., Huang, H. S., & Chen, Z. L. (2005). Finite element analyses of CFT columns subjected to an axial compressive force and bending moment in combination. Journal of Constructional Steel Research, 61, 1692–1712.
Ilyushin, A. A. (1948). Plasticity. Moscow: Gostekhizdat.
Johanson, M. (2002). The efficiency of passive confinement in CFT columns. Steel Composite Structure, 2(5), 457–464.
Karpenko, N. I. (1996). General models of reinforced concrete mechanics. Russia, Moscow: Stroyizdat.
Karpenko, N. I., Karpenko, S. N., Petrov, A. N., & Palyuvina, S. N. (2013). Model of reinforced concrete deformation in increments and the calculation of beams-walls and bent plates with cracks. Petrozavodsk: Publishing house of PetrSU.
Kotsovos, M. D. (1980). A mathematical model of the deformational behavior of concrete under generalized stresses based on fundamental material properties. Journal of Construction Materials, 13, 289–298.
Krishan, A. L. (2008). New approach to estimating the durability of compressed pipe-concrete columns. In Concrete durability: Achievement and enhancement: Proceedings of the 7 th international congress, Scotland: University of Dundee, 8-10 July 2008 (pp. 143–151).
Krishan, A. L., Astaf’eva, M. A., & Sabirov, R. R. (2016). Calculation and construction of concrete filled steel tube columns. Saarbrucken: Palmarium Academic Publishing.
Liang, Q. Q., & Fragomeni, S. S. (2010). Nonlinear analysis of circular concrete-filled steel tubular short columns under eccentric loading. Journal of Constructional Steel Research, 66(2), 159–169.
Mander, J. B., Priestley, M. J. N., & Park, R. (1988). Theoretical stress-strain model for confined concrete. Journal of Structural Engineering, ASCE, 114(8), 1804–1826.
Nishiyama, I., Morino, S., Sakino, K., & Nakahara, H. (2002). Summary of Research on Concrete-Filled Structural Steel Tube Column System Carried Out Under The US-JAPAN Cooperative Research Program on Composite and Hybrid Structures. Japan.
Saatcioglu, M., & Razvi, S. R. (1992). Strength and ductility of confined concrete. Journal of Structural Engineering, 118(6), 1590–1607.
Shams, M., & Saadeghvaziri, M. A. (1997). State of the art of concrete-filled steel tubular columns. ACI Structural Journal, 94(5), 558–571.
Storozhenko, L. I., Plakhotny, P. I., & Cherny, A. Ya. (1991). Calculation of concrete filled steel tube structures. Kiev: Budivelnik.
Tang, C., Zhao, B., Zhu, H., & Shen, X. (1982). Study on the fundamental structural behavior of concrete filled steel tubular columns. Journal of Building Structures, 3(1), 13–31.
Tao, Z., Uy, B., Han, L. H., & He, H. S. (2008). Design of concrete-filled steel tubular members according to the Australian Standard AS 5100 model and calibration. Australian Journal of Structural Engineering, 8(3), 197–214.
Tsuda, K., Matsui, C., & Fujinaga, T. (2000). Simplified Design Formula of Slender Concrete-Filled Steel Tubular Beam-Columns. In Proceedings of the 6th ASCCS conference on composite and hybrid structures, Los Angeles, 1 (pp. 379-396).