Supports are defined with the Set Vault Restraints command. Before the vault calculation is made, it is necessary to determine the supporting properties of the vault edges. With the Set Vault Restraints command, the edges of the vault are fixed to rotation and/or translation, or you can solved together with the structure with the semi-rigid diaphragm acceptance solution.

Location of Set Vault Restraints Command

After entering the vault command, you can access the Set Vault Restraints command from the vault toolbar that opens.

Usage Steps

  • Click the set vault restraints icon.

  • The Set Boundary Conditions dialog will open.

  • Click on the edge of the vault for which you want to change the boundary conditions.

  • In the set boundary conditions dialog, select the option you want.

  • Click the OK button to exit the dialog.

Set Boundary Conditions Dialog


Boundary conditions for separate solution

If a solution is made with the assumption of a fully rigid diaphragm, the vault is solved separately from the structure. In this case, the support conditions of the vault edges are determined by two options: rotation and translation. Vault loads should also be applied to the structure.

Translation restrained


If checked, the selected edge is restrained against translation.

Rotation restrained


If checked, the selected edge is restrained against rotation.

Boundary conditions for solution with building system

If the solution is made with the assumption of semi-rigid diaphragm, the structure - the vault is solved together. In this case, the objects to which the edges of the vaults are connected are determined by the options given in the dialog.


The edge of the vault is considered a fixed support.

Connection distance

Give the amount of distance that will be required for the vault edge to be attached to the support.

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