Impact analysis on finite element calculation error of the forced state of dam base surface
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Abstract:
Finite element numerical calculation is widely used in hydraulic engineering. Its accuracy and error is one of the important problems that need to be considered and controlled. Studies on this issue can provide technical support for the FEM in the design and check of hydraulic engineering. Gravity dam was used as the object of research. The factors influencing the error in finite element stress calculation were analyzed by comparing the resultant load value of the gravity dam with the internal force value of the dam base surface from finite element calculation (integral value of stress of dam base surface). The results showed that extracting the stress from different objects results in different finite element calculation error, even under the same stress state. It is necessary to select the proper object to extract the stress from according to the research goal and error control requirements. The error can be greatly reduced by making the thin-layer foundation adjacent to the dam the same size and in the same constraint condition as the dam body. Proper determination on mesh size, simulation range of foundation, number of paths to extract the stress, and spacing of extracting points can meet the required precision without overly consuming resources or time. The results can provide reference for controlling the finite element calculation error in similar projects.
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