PSI - Issue 70

Ashutosh Kumar et al. / Procedia Structural Integrity 70 (2025) 175–182

178

Table 1 Properties of anchor plate and anchor rod

Properties

Anchor Plate Linear Elastic

Tie Rod

Model

Linear Elastic Embedded Beam 1200 mm (length) 12 (diameter) 200 x 10 6

Structural element Young’s modulus (kPa) Size (mm x mm) Thickness (mm) Unit weight (kN/m 3 )

Plate

200 x 10 6 150 x 150

20

78.50

78.50

3. Validation of Finite Element Model It is essential to evaluate the accuracy and precision of the finite element model developed using PLAXIS 3D software prior to conducting a detailed numerical analysis. To verify its reliability, the results from the numerical model were compared with experimental data reported by Choudhary and Dash (2013). Fig. 3 displays the experimental test outcomes, compared against the typical pullout load-anchor displacement response obtained from the numerical model. The figure clearly demonstrates a good agreement between the numerical analysis and the experimental outcomes. However, slight deviations are observed in the numerical values compared to the experimental outcomes at initial anchor displacements, although the ultimate uplift capacity aligns closely with the experimental data. These discrepancies may stem from inaccuracies in determining soil properties, particularly the soil modulus, which significantly affects initial settlement. Conversely, the accurately determined peak friction angle likely contributes to the consistent uplift capacity observed in both cases. The soil properties incorporated into the numerical model are presented in Table 2.

30

25

Experimental Numerical Analyses

20

15

Uplift Capacity, (kN)

10

5

0

0

1

2

3

4

5

Anchor Displacement, (d/b) %

Fig. 3 Uplift capacity vs. anchor displacement response at RD =75% (Choudhary and Dash, 2013)

Table 2 Properties of soil (Choudhary and Dash, 2013)

Properties

RD =75%

RD =30%

Model

Mohr-coulomb

Mohr-coulomb

Young’s modulus (kPa) Poisson’s ratio, ( ν) Shear modulus (kPa) Cohesion (kPa) Unit weight (kN/m 3 ) Friction angle ( ϕ ) Dilation angle ( ψ)

10000

4000

0.3

0.3

3846

1538

0

0

16.20

15.0 30°

37°

7°

0