Definitions and Terminology
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Definitions and Terminology
starting point
The starting point is located at the lower left point of the first step when the stairs turn right at the landing, or the lower right side of the first step when turning left (i.e., the external side).
direction of staircase
This is the ascending direction from the first step. In winding steps, the direction is determined by the first step even if the staircase subsequently changes direction.
direction point of the first step
This point is related to the center point of a spiral staircase. The line between these two points defines the location of the first step of the flight.
direction of turn in landing
This is the direction you turn to at the first landing, relative to the first flight, or the direction of the first turn on a winding staircase when ascending the stairs. The staircase model 9 turns in two directions; therefore, the direction you define is the first turn.
width
This is the width of the stairs measured at right angles to the direction of the staircase.
parameters
The following parameters are those from which you choose two as the fixed parameters. The system calculates the others.
|
No. |
Prameter |
Description |
|
1. |
rise |
Height of an individual step. |
|
2. |
tread |
Width of individual step measured at 90° to the rise (In the case of winding stairs this is measured from the narrow side of the step). |
|
3. |
height |
Total height of the staircase (floor to floor). |
|
4. |
length |
Total length of the staircase (model 1 single flight only). |
|
5. |
end point of flight |
|
|
6. |
no. of stairs in the flight |
|
Flights are always measured in plan from the first (lowest) riser to the last (highest) tread, inclusive. The top step, in elevation, is the same level as the upper floor slab. The bottom plane of the staircase solid is the same level as the lower floor slab.
In linear staircases the thickness of the waist — the distance measured perpendicularly from the underside of the flight to the line of the flight — is an internal parameter determined by the system and cannot be set by the user. If you want to change the waist, it can be enlarged or decreased after creating the stair model using the regular polygon editing commands.
linear
Stairs with parallel risers within the same flight (in plan).
winding
Stairs with risers that are not parallel to each other, within the same flight (in plan), causing the direction of the staircase to change.
light steps
Steps of specified thickness where the underside of the step is parallel to the top surface. Each step is an independent entity.
massive steps
Steps whose material fills the whole height of the rise and whose underside slopes parallel to the general slope of the flight. Each flight is a single monolithic entity.
angle for measuring headroom
The angle from the first step of a spiral staircase, measured horizontally (on XY plane) to the point where the minimum headroom height is to be measured.