PSI - Issue 81

Mohammad Daffa Noorsyahputra et al. / Procedia Structural Integrity 81 (2026) 84–91

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Fig. 5. Mesh configuration of the trash box model.

4. Results and Discussion A numerical analysis was performed to examine the impact of operating load variations on the structural performance of the trash box within a water hyacinth collector vessel. The simulation results show that the magnitude of displacement and stress in the structure is directly affected by increased operational load. The analysis shows simulation results for normal operating load capacities, which are equivalent to 100% of the design capacity. As shown in Fig. 6, the maximum displacement occurs at the top edge of the trash box wall, with a value of approximately 26.81 mm, due to vertical pressure on the base plate transmitted upward through the side walls. Meanwhile, the maximum stress of 14.9 MPa occurs at the link between the base plate and the wall. This is the place with the highest stress concentration. This maximum stress value remains significantly lower than the yield strength of galvanized steel; therefore, the structure is considered safe and stable under normal operating conditions.

a

b

Fig. 6. Contour result of the trash box at 100% fill capacity: (a) displacement; and (b) von Mises stress.

Meanwhile, the simulation results for extreme load conditions (175% of operational capacity), shown in Fig. 7, reveal a significant increase in displacement and stress. The maximum displacement was 47.3 mm at the top edge of the wall, indicating greater deflection as pressure increased. The maximum stress increased to 26.7 MPa, but it remains considerably below the material yield limit. These results indicate that even under extreme load conditions, the trash box remains within the elastic range and is safe to use during operation.