DETERMINATION OF THE STRUCTURAL PARAMETERS OF TRAPEZOIDAL CHANNEL NUMERICALLY
DOI:
https://doi.org/10.21009/jpensil.v15i3.67041Keywords:
Trapezoidal Channel, Finite Element Method, Irrigation, Structural Capacity, ReinforcementAbstract
In this study, the effects of one geometric parameter, the upper width of a reinforced-concrete trapezoidal irrigation channel, on its finite-element response is examined. Three ETABS shell models were analysed to compare the responses of the models using the same bottom width and height, shell material properties, loading types and support assumptions, but different top widths. The comparison is based on the maximum displacement along with the same shell resultants M11, M22, V13, S11 and S22. Maximum displacements were 0.008, 0.026, and 0.026 mm for Types 1, 2, and 3, respectively. For all models, the flexural demand was controlled by the transverse bending resultant M22, which peaked at 6.225, 3.216 and 2.818 kN·m/m for the three models respectively, while the longitudinal bending resultant M11 was smaller with a peak of 0.948, 0.664 and 0.651 kN·m/m respectively. Reinforcement verification was therefore carried out in each direction: M22 (Principal Transverse Reinforcement) and M11 (Longitudinal/Distribution Reinforcement). According to the baseline SNI 2847:2019 check, for the analysed 200 mm lining the minimum reinforcement, and not flexural strength demand, is the key factor determining the steel quantity needed in practice. The results show that a measurable redistribution of shell actions occurs based on geometry. The numerical values are not a benchmark solution as a formal study of mesh convergence is not included.
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