AECOsim Building Designer Help

Stair Construction Settings - Stringers tab

Used to set or modify the stringer related properties for a stair assembly.



SettingDescription
Stringer Base Offset Sets the distance from the finished 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

Note: 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 finished 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.
Tip: The Top Offset option in the Placement tab is used in riser calculations only as a means for either extending or reducing the length of a stringer.
Left/Right Stringer Type Sets the stringer type for 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.


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.
Note: 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 a profile list. Opens the 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 Types.


(Stringer Offset (1), Stringer Carriage Offset (2)

Note: Stringer Carriage Offset is typically used in monolithic stair constructions.
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" denotes walkline

Base Profile Sets the stringer base profile which defines the stringer base end condition and the base connection.
Type Illustration
Horizontal


Vertical


Heel


Seat


Mitered


Base Seat Distance Sets the distance from the first nosing point of the first tread above the finished 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 opened and closed stringer types.
Base Extension Type Sets the 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).


  • 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.


    The extension refers to how the base end of the stringer is to be trimmed.
Base Extension Distance Sets the distance in working units for either the horizontal or vertical extension distance depending on the option selected for the Base Extension Type property.
Top Profile Defines the stringer top end condition and/or top connection.
Type Illustration
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.


Note: Applicable when Top Profile is set to Seat for both open and closed stringer types.
Top Extension Type Sets the 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).


  • 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.


    The extension refers to how the top end of the stringer is to be trimmed.
Note: The vertical extension option is not applicable for Seat and Mitred 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 for the Stringer Top Extension Type property.
Top Trim Distance Sets the perpendicular distance from the finished floor to trim the top of the stringer.


Stringer Part Definition Sets the stringer family and part pair.


Stringers family & parts - example, Part assigns matl_Stair_Stringer

Family and Part assignments can be applied straight/slanted panels as well as for planar and parametric profile risers. The selected Part option overrides the native definitions of family part, if any in the profile.
Parent topic: Stair Construction Settings