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BASE PLATE DESIGN METHOD

At the present time EPCServer has posted analysis for only square plates with a tension load located at the center of the plate. Many plate sizes and thicknesses have been preanalyized with the results captured in a database. The analysis starts with a square plate supported only at anchor locations. All Plates, regardless of the dimensions use a 1 1/2" edge distance from the center of the anchor to the edge of the plate. The finite element model is as follows:

NODES


ELEMENTS


The analysis for a center Load in the Z direction starts with a unit load applied at node 71

Nodes 20, 79, 155, and 145 are restrained in the Z direction

The analysis is run and the results provide positive deformations on the plate within the centerarea of the plate and negative deformations on the outside edges of the plate. Since base plates are mounted on a concrete surface, negative displacements cannot occur, thus providing us with a non linear problem.

The results of the analysis are scanned and where negative deformations occur, those nodes are remodled with a support in the Z direction. The analysis is run again to give us the final solution.

Note that our analysis does not affix a concrete stiffness, rather we apply a support with an infinite stiffness for both the anchor and concrete surface. The results of many plate analysis are saved to a data base. When a user inputs a plate size, thickness, and applied loads, our analysis interpolates to provide the best results.

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