PSI - Issue 70

Oberoi Kabrambam et al. / Procedia Structural Integrity 70 (2025) 74–81

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Nomenclature CFST Concrete-filled steel tube FE Finite element B

Side length of hexagonal section Height of the hexagonal section

H

t

Thickness of steel tube Ultimate moment Yield stress of steel tube

M u

y f c f

Unconfined compressive cylinder strength of concrete Unconfined compressive cube strength of concrete

cu f cc f

Confined concrete compressive strength Unconfined concrete compressive strain Confined concrete compressive strain Young’s modulus of confined concrete

c 

cc 

cc E

2. Model description Nonlinear FE (Finite element) model of regular hexagonal cross-sectional shape CFST beam were prepared using ABAQUS software. All models were performed 4-point bend test as shown in Fig. 3 and FE model made using ABAQUS software is shown in Fig. 4. The displacement load option was adopted to represent the point loads. In Table 1, B-20 represents hexagonal CFST beam of concrete strength 20 MPa.

Fig. 3. Test setup (all dimensions are in mm) ( İlgün and Sancioğlu , 2023).

Fig. 4. FE model.

Table 1. Specimen labels and material properties. No. Specimen B (mm)

H (mm) 207.85 207.85 207.85 207.85

t (mm)

B/t

f y (MPa)

f c (MPa)

1 2 3 4

B-20 B-25 B-30 B-35

120 120 120 120

2.5 2.5 2.5 2.5

48 48 48 48

236.3 236.3 236.3 236.3

20 25 30 35