Parameters of structural model

The parameters describing structural model are summarised in the table below.

priority definition

This parameter specifies "how" the priority will be defined.

priority value

The value defines the priority of the 1D member.

perpendicular alignment

This option specifies the alignment of the 1D member to its middle axis.

eccentricity definition

This parameter defines eccentricity that may be introduced.

eccentricity ey, ez

Depending on the previous parameter, the eccentricity can be specified.

end cuts

End-cuts can be defined automatically or manually. See below.

offset parameters

Offset parameters differ for automatic and manual end-cuts. See below.

In addition, there is one more parameter related to structural model. The basic beam parameterType defines the structural type of 1D member. This parameter defines the priority of the 1D member if the priority is specified according to member.

Priority

The priority is taken into account when connection of intersecting or touching 1D members is solved. The meaning will be best explained on a small example.

Let’s assume a column with a 1D member attached to its head. The calculation model looks like:

image\Wnd_CAD_Prior.gif

Now, let’s display the structural model. The priority of the column (B17) is set to 100. The priority of the inclined 1D member (B18) is set to 80. The automatically created detail will look like:

image\Wnd_CAD_Prior_A.gif

Now, let’s decrease the priority of the column (B17) to 50. The result will be:

image\Wnd_CAD_Prior_B.gif

In case a connection node is an inner node of a member, this member will be always recognized as column, independently on the priority of that member.

Perpendicular alignment

If adjusted to default value, the alignment of the structural model is taken from the alignment of the calculation model.

Eccentricity

The eccentricity may be defined in several ways:

whole member

The eccentricity is constant along the 1D member.

each end point

The eccentricity is defined separately for the two end points. In between, it varies linearly.

purlin on rafter

The eccentricity is so adjusted so that one member is put (laid) on the other. This option is useful mainly for "intersecting" 1D members that touch with their surfaces.

See below.

Purlin on rafter

The effect of this option is shown on the following two pictures. The first one shows intersecting beam without defined eccentricity.

image\Wnd_CAD_Purlin_1.gif

In the second picture, option Purlin on rafter is assigned to transverse beams. As a result they are put atop the other two beams.

image\Wnd_CAD_Purlin_2.gif

Note 1: The priority of "purlins", i.e. the beams with Purlin on rafter option must be lower than the priority of the intersecting beams. Otherwise, the setting will have no effect.

Note 2: Purlins and rafters must be connected by means of linked nodes. Otherwise the automatic calculation of vertical offset cannot be performed.

End cuts

Automatic end cuts

Automatic end cuts are calculated automatically. Individual 1D members are so adjusted to make a neat detail in joints. In addition, it is possible to define a gap that must be made between the face of the given 1D member and the joined member.

x-gap begin

gap at the beginning of the 1D member

x-gap end

gap at the end of the 1D member

Manual end cuts

The user may define the detail of the 1D member end manually. This may be useful for large models that do not change any more. Once the manual end cut is adjusted, there is no need to calculate it again when the model is regenerated. It also enables the user to design special details.

begin x-offset

end cut in longitudinal direction at the beginning of the 1D member

begin Rz

inclination Rz of the face of the 1D member at the beginning of the 1D member

begin Ry

inclination Ry of the face of the 1D member at the beginning of the 1D member

end x-offset

end cut in longitudinal direction at the end of the 1D member

end Rz

inclination Rz of the face of the 1D member at the end of the 1D member

end Ry

inclination Ry of the face of the 1D member at the end of the 1D member

Example

beam:

automatic end cut

image\endcut1.gif

beam:

automatic end cut

gap = 50 mm

image\endcut2.gif

beam:

manual end cut

Offset filled in from previous automatic end cut.

The end offset is 50 mm bigger than the beginning offset.

image\endcut3.gif

beam:

end offset = 500

image\endcut4.gif

beam:

end offset = 0

Ry = 135

column:

Ry = 45

image\endcut5.gif