Secondary - Description
(Revised: 11/01/2016)
The Secondary Members
Description tab is used to describe the secondary member's basic parameters. General shape, depth, material thickness, and
other basic information. This tab has
multiple uses and the selection criteria will vary depending on the Secondary
Member Type and Location.
Properties for Z purlins: Properties for Truss Purlins:
Shape
From
this drop list, select the secondary shape of the active Secondary Member(s). The list is based on valid shapes for the secondary
location and purpose.
This
selection will affect the other options on this tab. Also some of the options
on the adjoining tabs may be dependent on the shape and the other criteria on
this tab.
Depth
From
this drop list, select the secondary depth of the active Secondary Member(s). The list is based on valid shapes for the
secondary location, purpose, and the Secondary Shape.
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Notes:
A Bar Joist depth must be input, this
dimension is not the seat depth (offset), but depth of the Bar Joist in inches.
Thickness
Constraints:
Constraints - Minimum
Select
this radio button to describe the minimum secondary thickness that can be used
during the secondary design function.
Constraints - Hold
Select
this radio button to describe a specific secondary member thickness that will
be used during the secondary design function.
Thickness
This
drop list is active after the secondary design has been run. It will originally
display the secondary thickness for the member(s).
The
thickness can be greater than the minimum thickness selected in the
constraints, if the Hold option was not selected.
Constraints - Thickness
From
this drop list, select the secondary thickness for the member(s).
This
Thickness Constraint will be either Held or the Minimum used during the
secondary design, base on the selected radio button
option.
Depending
on the shape and the depth of the secondary member(s), this value will vary.
Top and Bottom Chord
Thickness
Select
this radio button to describe the minimum chord thickness for WideBay Truss
Purlins.
Boxed Section?
Check
box if a Boxed Bottom Chord is needed. This option applies only to WideBay
Truss Purlins.
Boxed
member thickness will match bottom chord thickness.
Boxed
members are field installed and should only be provided if necessary.
Member:
Member - Continuous
This drop list is available when the secondary
shape can be lapped. This option will
attempt to lap adjacent secondary members at frame location, if possible.
When a selection is made from this drop list,
additional options for lap constraints are available on the Secondary
Information tab.
„
Notes:
Currently a Zee Shaped member is
required to enable this option.
When continuous conditions result in having
a short (≤ 6ft) span member, design may automatically combine the short
member with the adjacent member during the secondary generation process,
resulting in 1 longer member (this is more efficient and easier to erect).
Though the Continuous option may be
selected, some conditions will require a simple girts or purlins base on other
criteria. When recognized these conditions are adjusted to the appropriate data
automatically.
Member – Simple Lap /
Simple Butted
This
selection in the drop list is available when the secondary shape cannot be
lapped or it can be set as an option.
„
Notes:
Though the Continuous option may be
selected, some conditions will require a simple girt or purlin based on other criteria.
When recognized these conditions are adjusted to the appropriate data
automatically.
Simple Lap is only an option on roofs.
Simple Lap and Simple Butted are both
available on walls.
Standard
Controls:
See also: