Strength and Deformability of the Concrete Core of Precompressed Concrete Filled Steel Tube Columns of Annular Cross-Section

Abstract

The advantages of short concrete filled steel tube columns with a precompressed concrete core are presented in the article. Particular cases, where such compression is most appropriate, are listed. Taking into consideration the structural features of concrete filled steel tube columns it is recommended to calculate their bearing capacity on the basis of deformation model of reinforced concrete. The reliability of this calculation will be largely dependent on the conformity of the accepted diagram of the concrete core deformation with its actual behavior. Formulas for determining the strength of precompressed concrete core and the ultimate strain of its shortening are proposed, which allow constructing the sufficiently accurate deformation diagram.

Simplified Method for Calculating the Bearing Capacity of Slender Concrete-Filled Steel Tubular Columns

“…Currently, a large amount of experimental research is being carried out on new types of pipe-concrete structures, including columns made of high-strength [8] and lightweight concrete [9]. Various types of cross-sections have been explored, including square and rectangular [10][11][12][13], hexagonal [14][15][16], octagonal [17], annular [18,19], elliptical, and oval [20,21] columns. In addition to the material of the core, the material of the shell also varies.…”

Simplified 2D Finite Element Model for Calculation of the Bearing Capacity of Eccentrically Compressed Concrete-Filled Steel Tubular Columns

“…The specifics of calculating the strength of short, centrally compressed concrete, steel pipe columns of the annular cross-section are considered in [15,16]. In addition, the complex stress state of the concrete core and the steel shell and the uneven distribution of transverse stresses over the cross-section of the design elements are taken into account.…”

Using statistical methods to determine the load-bearing capacity of rectangular CFST columns

“…The priority issue of structure designing is ensuring the strength and reliability of the structures, which should be solved, first of all, on the basis of calculation methods that satisfy all the requirements, according to numerous studies in this field [5][6][7][8][9][10][11][12][13]. The authors propose to use regression analysis as one of these methods -a statistical research method that allows for evaluation of the degree of the impact of independent factors on the dependent variable.…”