Numerical Study of Circular Concrete Filled Steel Tubes Subjected to Pure Torsion

Abstract

This study numerically explored the torsional behavior of circular concrete-filled steel tubes (CFST) under pure torsion. Numerical models of CFSTs were developed in ABAQUS. The models were validated by comparing with the experimental results available in the literature; then, these models were used for parametric study. Based on the obtained results, the mechanism of torsional moment transferring from steel plates to CFST was presented. The results obtained from the parametric study indicated that the compressive strength of concrete marginally improved the torsional moment capacity of the CFST while concrete prevented buckling and helped the steel tubes to work more effectively. The steel strength significantly affected the torsional moment capacity of the CFST. When the yield strength of steel increased from 235 to 420 MPa, the yield torsional moment of the CFST increased by approximately 50%. The yield torsional moment capacity of the steel tube had the strongest correlation with the yield moment of the CFST, followed by the ratio of diameter to thickness of the steel tube while the parameters related to the compressive strength of concrete exhibited a poor correlation with the yield torsional moment.

Meso‐scale modeling of size effect on pure torsional failure of concrete‐filled steel tubular columns

“…The comparison between the calculated values and the simulation values as well as the test values 1,8,9,14,16,17,46,48,49,50 is shown in results, the specimens have different section sizes (B = 114, 130, 140, 160, 200, and 400 mm), steel ratios (0.05-0.2), steel strength (345-450 MPa), concrete strength (30-90 MPa), and slenderness ratios (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). It can be seen that under different section sizes, steel ratios, steel yield strength, concrete strength, and slenderness ratios, the errors between the modified formula and the experimental values are <21%, indicating that the modified formula is suitable for the calculation of the torsional capacity of the square columns.…”

“…Beck and Kiyomiya, 10 Le et al 11 conducted pure torsion tests on CFST columns, pure steel tubes, and plain concrete columns. In addition, some numerical simulations on CFST columns have been carried out by Le et al 12 and Lee et al 13 Through the analysis of the test and simulation results, it is pointed out that the core concrete can prevent the concave buckling of the steel tube, so that the steel tube has a large plastic deformation but no strength degradation, resulting in a significant improvement on the bearing capacity and ductility of the CFST columns. Nie et al 14,15 conducted tests under pure torsion, compression‐torsion, and bending‐shear‐torsion states of CFST columns, and established a theoretical model for process analysis of CFST columns under torsion called the laminated tubes method.…”

Rotor Fatigue Life Calculation Using Constant-Amplitude Load Cycles for an Interior Permanent Magnet Synchronous Motor

“…If a multilinear stress-strain curve is unavailable, it can be approximated to a bilinear stress-strain curve using the mechanical properties provided in the material datasheet, as shown in Fig. 15 [44], [45]. Slope OA, modulus of elasticity, and slope AB', tangent modulus, in Fig.…”

Research on Thermal Response Behavior of the Intumescent Coating at High Temperature: An Experimental and Numerical Study

“…Concrete-filled steel tubular (CFST) structures are widely used in modern buildings due to their excellent mechanical and construction performance [1,2]. However, the mechanical performance of a CFST structure degrades significantly with increasing temperatures, and the structure cannot maintain its strength and stiffness at high temperatures [3].…”