Project: HiCAD Steel Engineering

Straight Stairs - Rise Variants

Steel Engineering > Stairs/Railings > Industrial staircase

If you choose OK to exit the Straight stairs tab, HiCAD asks you to identify the stair start and/or the stair end, depending on the selected stairwell boundary. HiCAD automatically determines all possible rise variants for your stairs and makes them available to you for selection. The number of variants displayed depends on the settings for stairs.

You choose a variant by clicking the corresponding Number of rises ... button.

For each determined variant, HiCAD displays stair information which is regarded as a guideline for the stairs being easily negotiable.

• Tread (t)
  Step width minus the nose overhang
• Rise (r)
  Height from step to step
• 2r + t
  Rise (r) and tread (t) are in particular proportion to a human's step. A value of around 630 applies to stairs being easily negotiable.
• Rise angle
  A value between 30° and 45° applies to stairs being easily negotiable.
• Rise / tread ratio
  The ratio of rise to tread r : t should be between 1:1.73 and 1:1.
• Distance to stair start
  You can change this value subsequently. The value is predefined so that the distance from the stair start is equal to the distance from the stair end. Enter the new value, if desired. Click Preview. HiCAD checks the value you have entered and may issue an error message

Stair contour with steps (top view), (1) Distance from stair start, (2) Tread lines, (3) Distance from stair end

• Stair data
  You return to entering the stair parameters and can make any changes required there.
• Preview
  A preview of the stairs is displayed.
• Fit
  The stairs are fitted, taking into account the data you have entered.

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