AECOsim Building Designer Help

Stair Properties, Stringers panel

The Stair Properties dialog, Stringers panel, is used to set or modify the stringer related property settings for a stair assembly.



SettingDescription
Stringer Base Offset

Sets the distance from the finish floor to the stinger termination point. It provides a means for either extending or reducing the length of a stringer.

For structural reasons, stringers may extend beyond the finish floor. Some stringers are encapsulated with concrete at the floor and the stringer needs to extend down to the floor structure instead of the floor surface. A positive number is up, a negative number is down.

Stringer Base Offset(f) Floor Finish

Finish floor = Base floor point + Base offset

Stringers do not follow the convention of finish floor to finish floor used by tread and riser calculation using the Base Offset in the placement tab.

Stringer Top Seat Offset

Sets the distance from the finish floor to the stinger termination point.

To connect to different structural system, the Stringer Top Offset only applies to the stringer calculation without affecting the riser/tread calculations. A positive number is up, a negative number is down.

The Top Offset in the placement tab is used in riser calculations only provides a means for either extending or reducing the length of a stringer.

Left / Right Stringer Type

Sets the stringer type to the stair.

  • None – no stringer is applied to the stair assembly.

  • Open – the stringer is kept open as carriage.

  • Closed – the stringers are closed to stairs side.



    None



    Open



    Closed

Stringer Offset

Sets the distance between the nose or foremost edge of the tread and the top of the stringer, measured perpendicular to the stair slope.

Disabled when the Stringer type is set to OPEN. For a CLOSED stringer type, depending on the method used in stringer design, either one or both Stringer offset and Stringer Carriage offset are necessary. They are interrelated because the depth of stringer is controlled by our Stringer Section Profile. So if either the Nosing or Stringer Carriage Offset is set then the other value is the calculated results of the remaining distance.

Stringer Profile

Sets the stringer profile from the structural sections profile list. Opens Structural Sections filter list, where you can select one of the sections for a given code and type. The selected section profile's name is displayed in this text field.

  • Code – lists the loaded section file names, for example, us. The section profiles in the selected code appear in the section profiles list box.
  • Type – lists one or more section type associated with the code. Types are provided to group like section types within a section file. For example, I shapes, angles, tee and zee types are grouped together across multiple section files.
  • Section profiles list – displays section profiles for selected code and type. Double clicking on the desired section profile assigns the stringer profile.
Carriage Offset

Sets the distance from the heel of the tread and/or riser to the bottom of the stringer measured perpendicularly to the stair slope. Stringer Offset and Stringer Carriage Offset are interrelated.

Applicable to OPEN Stringer Type.



(1) Stringer Offset(2) Stringer Carriage Offset

Note: Stringer Carriage Offset is used in Monolithic Stair construction.
Carriage Inset

Sets the value that defines how far the open stringer is inset from the edge of the stair toward the walkline.



Left & Right Carriage Inset, w – walkline

Base Profile

Sets the stringer base profile that defines the stringer base end condition and base connection.

  • Horizontal
  • Vertical
  • Heel
  • Seat
  • Mitered – connected.


Horizontal



Vertical



Heel



Seat



Mitered

Base Seat Distance

Sets the distance from the first nosing point of the first tread above the finish floor to the vertical cut plane for the stringer seat.



Base Seat Distance

Enabled when Top Profile is set to Seat, and applicable for both OPEN and CLOSED stringer types.

Base Extension Type

Sets Extension Type to a CLOSED Stringer Type.

  • Horizontal – is the distance from the first risers nose to the trim plane of the stringer measured horizontally (parallel to the floor).


    Horizontal Extension

  • Vertical – is the perpendicular distance from the finish floor to the where it intersects the sloped top of the stringer. It is at the point the stringer will be trimmed vertically.


    Vertical Extension

    The extension refers to how the base end of the stringer is to be trimmed.

Base Extension Distance

Sets the distance in working unit for either the horizontal or vertical extension distance depending on the option selected in the Stringer Base Extension Type.

Top Profile

Defines the stringer top end condition and/or top connection.

  • Vertical
  • Seat
  • Mitered – connected.
  • Heel


Vertical



Seat



Mitered



Heel

Top Seat Distance

Sets the distance from the last nosing point of the last tread below the finish floor to the cut plane for the stringer seat.



Top Seat Distance

Applicable when Top Profile is set to Seat for both OPEN and CLOSED stringer types.

Top Extension Type

Sets Extension Type to a CLOSED Stringer Type.

  • Horizontal – is the distance from the last risers nose to the trim plane of the stringer measured horizontally (parallel to the floor).


    Horizontal Extension

  • Vertical – is the perpendicular distance from the finish floor to the where it intersects the sloped bottom of the stringer. It is at the point the stringer will be trimmed vertically.



    Vertical Extension

    The extension refers to how the top end of the stringer is to be trimmed.

Note: Vertical Extension option is not applicable for Seat and Mitered Stringer Top Profiles.
Top Extension Distance

Sets the distance in working units for either the horizontal or vertical extension distance depending on the option selected in the Stringer Top Extension Type.

Top Trim Distance

Sets the perpendicular distance from the finish floor to trim the top of the stringer.



Top Trim Distance

Stringer Part Definition

Sets the stringer family and part pair through the popped up pull down menus.



Stringers family & parts - example, Part assigns matl_Stair_Stringer

Family and part assignment could be done for straight/slanted panels as well as for plane and parametric profile risers. The value set through Part option overrides the native definitions of family part, if any in the profile.