Surface Type Error

Helpful Questions & Answers

  • Frequently Asked Questions (FAQs)

I received an error message “Surface of incompatible type... (Surface in upper plane of building story must be of ‘Load transfer’ type)” when running the calculation. What is the reason?

Answer

You have selected "Rigid diaphragm" as the story slab stiffness in the Building Stories (Image 02). The "Rigid Diaphragm" is used to rigidly connect all components of a story in the floor plane with a rigid link. By doing so, the floor can no longer be defined with its real stiffness.

Therefore, surfaces with the "Load Transfer" stiffness type must be used (Image 03). It is not possible to create internal rigid links for surfaces with the stiffness type "Standard".

Keywords

Building model Load transfer Rigid diaphragm Error message Building story Incompatible Surface type

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  • Updated 30 January 2023

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