Commands and functions > Stairway > Stairway calculation
  
Stairway calculation
Ribbon:
Tab ATHENA > Group Drawing > Stairway calculation
Menu:
ATHENA > Drawing > Stairway calculation
Toolbar:
ATH Drawing > Stairway calculation
Command input:
ath_fstair
This command divides a line or a distance into stairway steps. The stairway parameters can be set in a dialog box.
Dialog box Stairway calculation
db_ath_fstair
The dynamic preview box shows the true sectional illustration of the stairway as well as its start and end points. Optionally, markings can be switched on when stairway dimensions deviate.
Dialog box section Display
Axis
Creates a stairway section with axis. The axis marks the start and end points of the stairway.
Baseline
Creates a stairway section with baseline.
Mark deviation
Marks deviations if the stairway dimensions deviate from the stairway formula.
Outline
Generates the outline of a stairway section.
Filled
Creates a filled stairway section.
Hatched
Creates a hatched stairway section.
Layer
Opens the Dialog box Assign Layer. You will find further information on this in the Chapter Layer assignment.
Hatch
Opens the Dialog box Assign hatch pattern. You will find further information on this in the Chapter Hatch pattern assignment.
Dialog box section Dimensions
Vertical height
Defines the height of the stairway.
Flight length
Defines the flight length of the stairway.
Input
Temporarily closes the dialog box to adopt a center distance from the drawing. Then the following input request appears:
Input request 
Option Points
Specify starting point of stairway line or [Object/?]:
Specify the starting point of the stairway line.
Select the Option Object to specify the stairway line by object selection.
With the option ? you call the help.
Specify end point of stairway line or [Object/?]:
Specify the end point of the stairway line.
Option Object
Select object or [Points/?]
Select a line as the stairway line.
Select the Option Points to define the stairway line by specifying points.
When you have specified the stairway line, ATHENA returns to the Dialog box Stairway calculation.
Dialog box section Properties
Rise
Defines the minimum and maximum values for the rise of the stairway. When you activate this option, the largest possible rise (< maximum rise) is used for the stairway calculation.
Going
Defines the minimum and maximum values for the going (tread depth) of the stairway.
When you activate this option, the largest possible going (< maximum going) is used for the stairway calculation.
Step proportion
The step proportion is calculated from twice the rise plus going (2s+a). When you use this option, the stairway is calculated according to the best step proportion.
With this computation method the results in each case from the minimum and maximum rise and minimum and maximum going are compared to the mean step proportion. The result closest to this is accepted.
Number of steps
Carries out the stairway calculation according to the number of steps. You can define the number of steps in the input field.
Slope
The ideal slope of a stairway in the interior is 30°. The current slope is computed and displayed in the results section.
Comfort
The ideal comfort of a stairway is calculated from the going minus rise (a-s) and is 120 mm.
The current comfort is computed and displayed in the results section.
Sure-footed safety
The ideal sure-footed safety of a stairway is calculated from the going plus rise (a+s) and is 460 mm.
The current sure-footed safety is computed and displayed in the results section.
The stairway calculation is closed with OK and you can insert the stairway section with the settings made into the drawing.