In order to export loads, load cases and loads combinations one should select the Loads and load comb. to be exported in the StruXml Export dialog.

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Load cases

If the Export Loads and load comb.option is selected, all Load Cases existing in Revit will be exported to FEM-Design (including those loads cases that do not contain any loads assigned).

The only property of the load case that is exported from Revit to FEM-Design is a Name. Definition of Nature and Category is not relevant for the export to FEM-Design, except in one case. If the Category is set to Dead Loads, the load case will be exported as load case Type: +Struc. Dead load.  All the other load cases exported from Revit to FEM-Design, will be assigned with the Type: Ordinary.

Example

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Loads

Following Load types are exported from Revit to FEM-Design:

  • Point Load
  • Line Load
  • Area load
  • Hosted Point Load
  • Hosted Line Load
  • Hosted Area load

Example

Figure below shows a vertical force of 1kN is applied to a column in Revit. The value of the force is -1kN so the force acts downward. The force is applied into a load case: Dead load. After importing it to FEM-Design, the load value is –1 kN, as defined in Revit.  The correct direction of the load is preserved by setting a positive direction (with the global Z axis) that is consistent with the positive direction of Revit coordinate system. The load is assigned to a corresponding load case Dead load.

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If more force components is assigned into one point load or one surface load, the visible force in Revit will be displayed as resultant force. After exporting it to FEM-Design, the point (or surface load) will be divided into separate components. So, the column from figure above will be loaded with a force of 1kN acting in the X – direction.

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Load combinations

Following load combinations parameters are exported:

  • Name
  • Formula
  • State
    • Ultimate corresponds to Ultimate Limit State in FEM-Design,
    • Serviceability corresponds to Serviceability - characteristic limit state in FEM-Design.

Type and Usage are ignored.

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Load comment

It is possible to export load comments from Revit to FEM-Design. If there is a comment in the Comment instance parameter of a point, line or area load in Revit, we will automatically export it to struxml, into the load comment parameter.

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Created by IwonaBudny on 2018/10/31 12:45
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