Mechanical Displacement System Design, Saint-Martin-de-la-Porte, France
The hydroelectric power plant project goal was to analyze the resistance of a double mechanical displacement system on rails subjected to tensile stress.
AGICEA, Orange, France
Groupe MOSCATELLI, Sorgues, France
Technical Details and Calculation
The model includes various solids with different materials (steel S235, S275, bronze, steel 42CD4). The rail is supported by clamping connections fixed on foundation plates. The entire system can be moved, with the four rollers fixed on a slide component and limited to displacement in the x- and y-directions. The entire frame structure is represented by double UPN sections.
Since no tension force was specifically defined, the model was calculated with an iterative method taking into consideration the Eurocode safety factor until the stability and elastic limit of each material was reached.
The decision was made to calculate each component as a solid model (3D FEA) to check each mesh point as well as whether the contact stresses and internal deformations would affect the behavior of the respective part. Additionally, the mesh was considerably refined.
After the calculation, the deformation was checked to ensure realistic results.
Then, each component was isolated from similar material elements to view the maximum von Mises stresses. Figure 03 displays the clamping connection and roller von Mises stresses.
The iterative calculations were completed until the stability or elastic limit of the material was reached to derive the maximum allowable tensile force in the system. This maximum allowable load was determined to be 1.41 tons.
In addition, the project calculation package has been published where all results, input data, and design checks can be reviewed.
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Designing rigid end plate connections is difficult for four-row connection geometries and multi-axis bending stresses, because there are no official design methods.
The model is constructed by means of parameters for geometry and loads and regenerates when the parameters are changed.
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Programs Used for Structural Analysis
Module Extension for STEEL EC3 and RF-STEEL AISC
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements