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

Abstract

Concrete-filled steel tubular (CFST) columns are widely used in construction due to effective resistance to compression and bending joint action. However, currently, there is no generally accepted effective calculation method considering both nonlinearities of the materials and lateral compression. The article proposes the finite element analysis method of concrete-filled steel tubular columns in a physically nonlinear formulation by reducing a three-dimensional problem to a two-dimensional one based on the hypothesis of plane sections. The equations of Geniev’s concrete theory of plasticity are used as relations establishing the relationship between stresses and strains. The technique was tested by comparing the solution with the calculation in a three-dimensional formulation in the LIRA-SAPR software package and with the experimental data of A.L. Krishan and A.I. Sagadatov. It has been established that the effective area of operation of circular-section columns are small eccentricities of the longitudinal force. The proposed approach can be applied to analyzing the stress–strain state and bearing capacity of pipe-concrete columns of arbitrary cross-sections. There are no restrictions on the composition of concrete, and the shell material can be steel and fiberglass.

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

“…Then, the element curvature increment ∆χ = − d 2 ∆v dz 2 is calculated based on the value of ∆v, as well as the value ∆ε 0 z from the first equation in (9). Based on the values of ∆χ and ∆ε 0 z , it is possible to determine the stress state change in the each cross-section plane from the solution of the FEM equations obtained in [26]:…”

“…The concrete tangential modulus of elasticity is determined in accordance with the concrete deformation theory of plasticity developed by G.A. Geniev [26] as a function of shear strain intensity Γ:…”

“…The authors of [26] present a technique for reducing the three-dimensional problem of calculating an eccentrically compressed short CFST column to a two-dimensional one based on the hypothesis of plane sections. A further development of this article [26] for the case of slender CFST columns is presented in [27], in which a combined finite element (FE) was proposed, connecting a classic bar FE with a transverse cut in the cross-section to take into account the effect of lateral compression. Compared to 3D modeling, this approach made it possible to reduce the number of unknowns by approximately four times without a significant loss in the accuracy of the results.…”

Influencia de la adición de fibra de vidrio AR sobre la resistencia a la compresión del concreto f’c 210 kg/cm2. Una revisión sistemática: 2020 – 2024

“…Las recientes investigaciones llevadas a cabo por Chepurnenko et al (2021) han arrojado luz sobre las notables mejoras en la resistencia y adaptabilidad de las mezclas de hormigón cuando se integran fibras de vidrio. Este estudio hace uso del análisis de elementos finitos para convertir un complejo problema tridimensional en uno más manejable de dos dimensiones, empleando las ecuaciones de la teoría de plasticidad de Geniev.…”

Application of Multimedia Virtual Technology in Mechanical Engineering Display Design

“…Krishan and A.I. Sagadatov [8]. Reinforced bending concrete structures by adding sections and evaluating the bearing capacity of ISSN 2616-5767 Vol.6, Issue 6: 58-64, DOI: 10.25236/AJETS.2023.060609…”