Straight Stairs - Parameters (3-D SE)

"Civil Engineering" docking window" > Steel Engineering > Stairs+Railings > Stairs

You use the stair parameters on the Straight stairs tab to define 

• the size of the stair start and stair end and the height of the unfinished floor,
• the stringer type for the first and last steps,
• the stringer and step type,
• the distances between stringers and steps and the nose overhang as well as
• the number of rises.

(1) Height above datum for stair start, (2) Height above datum for stair end, (3) Height above datum for unfinished floor, (4) Stringer beam height, (5) A1 stringer step upper edge, (6) A2 stringer step upper edge, (7) A3 stringer step upper edge, (8) U1 nose overhang, (9) Unfinished floor

Parameters for straight stairs

• Height above datum
  Enter the values for the stair start and stair end. If you want to use a specific floor structure for which the unfinished floor needs to be taken into account, enter this value as well. The values for the stair start and stair end determine the flight length. This is the dimension of first step front edge to last step front edge

• Stringers for stair start / end
  You choose the stringer type for the stair start and the stair end. Simply click the relevant symbol. If the Without stairwell option is activated on the Settings: Straight stairs tab, you can specify the size of the first/last step in the Length field.

• Stringer type, Step type
  The stringer is the component of a staircase that bears the steps and bounds the run to the side. The stringer type allows you to choose between a U-beam and broad flat steel. You then define the dimensions of the stringer via the selection list which you activate by clicking the button on the right. You choose the step type and the size of the step in the same way.

• Distances and Nose overhang
  In this window pane, you define the distances between stringers and steps as well as the nose overhang.
• A1
  Perpendicular distance from the floor to the upper edge of the stringer.
• A2
  Direct distance from the upper edge of a step to the upper stringer border.
• A3
  Perpendicular distance from the floor to the upper edge of the stringer.
• U1, W
  The stairs can either be generated by specifying the nose overhang U1 or the rise angle W. Activate the desired parameter and enter the value.
  The nose overhang is the horizontal dimension by which the front edge of a step protrudes over the width of the tread of the step below. It should be at least 3 cm. The rise angle results from the step width, the number of rises and the staircase height.
  If you specify the rise angle W, the nose overhang results from the step width, number of rises and the staircase height.
• Number of rises
  This value defines the number of rises. It is only evaluated if the Rise data acc. to standard checkbox on the Settings: Straight stairs tab is inactive. If you enter 0 or 1 (no steps), the number of rises which comes closest to the mean of the step rule (2r+t=620) is automatically determined in the Rise variants dialogue window 

 Related Topics

Straight Stairs (3-D SE) • Sketch (3-D) • Stairs and Railings (3-D SE)