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Validation/Solver Error: Diaphragms - Too few nodes in a rigid diaphragm

Tekla Structural Designer Rigid Diaphragm validation error Solver Error Mat Raft
2022
Tekla Structural Designer
2023
Tekla Structural Designer
2024
Tekla Structural Designer
2025
Tekla Structural Designer
2026
Tekla Structural Designer
Environment
Not environment-specific

Question

I am getting a “too few nodes in rigid diaphragm” error for a Mat foundation I created. I note that the Mat is not meshing for some reason when viewing the Solver scene view and presume this is why there are insufficient nodes?

 

Answer

To form a rigid diaphragm there must be at least three non-collinear nodes (that are not supports).

A Mat foundation actually has supports at every node so a diaphragm is not necessary/possible to construct.

The solution is to select the Mat slab and uncheck the Include in Diaphragm option. A Mat is meshed in the 3D analysis, so will act as a diaphragm without the (rigid) diaphragm setting applied.

 
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