Stair Alignment
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Sets the controlling anchor point for the stair.
Top
Left
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Top Center
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Top
Right
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Middle
Left
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Middle
Center
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Middle
Right
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Bottom
Left
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Bottom
Center
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Bottom
Right
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Stair Terminology
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- Base
is the bottom of the stairs with
direction of travel going up
- Top
is the top of the flight of the stairs
with direction of travel down.
- Center
is a stair alignment that uses the
walk line for placement
Examples
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Left Base alignment
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Left Top alignment
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Center Landing alignment
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Tip: Left/ Right alignments
help with placing stairs along walls.
- Landing is an intermediate platform; the first
segment defining the starting (base) stair flight, with direction of travel
down from the landing, and the second segment defining the ending (top) stair
flight with direction of travel up from the landing.
Note: Stair will not get placed by start/end with landing, minimum
of 2 risers at start/end are required. Start and End landings can be inserted
after placement of stair.
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Stair Configurations
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OpenBuildings Designer provides
predefined set of stair configurations including common industry standard stair
configurations. Dynamic placement allows you to define unique stair
configurations through precise placement of stair and landing segments. The
Preview on the placement dialog displays the actively selected configuration.
Note: Winder
stairs are designed to adhere to the International Building
Code, which follows 2 main requirements for most stair types:
- The walk line is
the same length as the standard treads on the entire stair (measured 12" from
the edge in International Building Code). While the code allows for 3/8"
tolerance, that's usually a field construction tolerance, not a
drawing/modeling tolerance.
- The small side of
the winder tread meets a minimum dimension (6" in International Building Code)
Note: Spiral
stairs are designed with an uniform curved walk line keeping
the minimum tread depth on the inner curve. The tread depth and riser height on
the line of travel are maintained.
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Straight Stair
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Constructs a floor to floor straight run of stairs
with two data points (start point and
direction).
The
start point defines the flight origin
(1), and the
direction point (2) along with the mouse
movements determines the direction of the run.
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Straight Stair with Two
Runs
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Constructs a straight run of stairs with an
intermediate landing with two data points (start point,
and
landing point).
The
start point defines the flight origin
(1), and the
landing point (2) determines the landing
position and the direction of the run. This is done by moving the mouse over
the stairs to manipulate tread distribution in the runs.
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Quarter Turn Stair
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Constructs a floor to floor quarter turn stair with
three data points (start point,
direction 1st run, and
direction 2nd run).
The
start point defines the flight origin
(1). The
direction 1st run point defines the
landing location; as you move the pointer, distributes the treads in the first
stair flight (2). The
direction 2nd run determines the angle
of the remaining stairs (3).
Note: For
stairs with an even numbers of risers, the start and end segments have an equal
distribution of risers, whereas a stair with an odd number of risers, the
starting segment has an additional riser compared to the ending stair run.
Tip: You can lock into a desired
angle with
AccuDraw. In the quarter turn the cursor
movement can orient the segment in 180° in the X–Y plane. The landing depth is
typically set to the stair width (W), plus one tread (T). However, it can be
modified (increased) using the
Heads Up Display dimension editor.
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Half Turn Stair
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Places a floor to floor half turn stair with three
data points (start point,
1st landing point,
2nd landing point).
The
start point defines the flight origin
(1). The
1st landing point locates the landing
and distributes the treads accordingly in each segment (2). Moving the mouse
away from the origin, when defining the
2nd landing point flips the segment in
either direction (3). This orientation determines the direction of travel of
the legs of the stairs in clockwise or counterclockwise directions, and
determines the landing width.
Note: The half turn stair
configuration resembles the quarter turn, except the
2nd landing point controls the landing
width keeping the segment orientation unaltered.
Tip: The
default distance between two segments is set equal to the tread depth (T).
Extending the cursor beyond 2W+T stretches the landing width.
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Two Quarter Turn Stair
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Places a floor to floor two quarter turn stair with
two landings with five data points (start point,
1st landing point,
direction 1,
2nd landing point, and
direction 2).
The
start point defines the flight origin
(1). The
1st landing point determines the
location of the first landing and tread distribution in the first stair run
(2). The
direction 1 point determines the
rotation of the remaining stair flights in a 180° range (3). The
2nd landing point determines the
location of the second landing and tread distribution in the second stair run
(4). The
direction 2 point determines the
rotation of the remaining stair flight in a 180° range (5).
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Three Quarter Turn Stair
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Places a floor to floor three quarter turn stair
with two landings with seven data points (start point,
1st landing point,
direction 1,
2nd landing point,
direction 2,
3rd landing point,
direction 3).
The
start point defines the flight origin
(1). The
1st landing point determines the
location of the first landing and tread distribution in the first stair run
(2). The
direction 1 point determines the
rotation of the remaining stair flights in a 180° range (3). The
2nd landing point determines the
location of the second landing and tread distribution in the second stair run
(4). The
direction 2 point determines the
rotation of the remaining stair flights in a 180° range (5). The
3rd landing point determines the
location of the third landing and tread distribution in the second stair run
(6). The
direction 1 point determines the
rotation of the remaining stair flights in a 180° range (7).
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Quarter Turn Winder Stair
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Places a quarter turn winder stair assembly with
three data points (start point,
flight 1 end, and
direction).
The
start point defines the flight origin
(1). The
flight 1 end point determines tread
distribution on the first stair run as well as its direction (2). The
direction point determines the angle of
the second stair run (3).
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Half Turn Winder Stair
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Places a half turn winder stair assembly with three
data points (start point,
flight 1 end, and
direction)
The
start point defines the flight origin
(1). The
flight 1 end point determines tread
distribution on the first stair run as well as its direction (2). The
direction point determines the angle of
the second stair run (3).
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Two Quarter Turn Winder
Stair
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Places a two quarter turn winder stair assembly with
four data points (start point,
flight 1 end,
flight 2 end, and
direction)
The
start point defines the flight origin
(1). The
flight 1 end point determines tread
distribution on the first stair run as well as its direction (2). The
flight 2 end point determines tread
distribution on the second stair run (3). The
direction point determines the angle of
the second stair run (4).
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Spiral Stair
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Places a spiral stair assembly with two data points
(start point and
direction).
The
start point defines the flight origin
(1). The
direction point determines the overall
angle of the spiral stair (2).
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Height By
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Sets the method for defining the height of a flight
of stairs to one of the two options;
- Height
(Fixed) – Defines absolute height for a single flight of the stair
assembly.
- Floor
Constrained – Uses the floor definitions to determine the height of
the stair. The floor to floor distance of the currently active floor is taken
as stair height.
Tip: For
Floor Constrained height method you
must first select an activate floor in floor selector.
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Place Equal Stair Runs
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ON by default , stairs are
created with even runs and require less precision in placement. It requires one
less click in case of two quarter turn stair and two less clicks in case of
three quarter turn stair placement.
For stair with odd number of risers, the starting
flight has an additional riser compared to the ending stair flight. The
distribution of run will be as follows
Straight Stair with Two Runs -11, 10
Two Quarter Turn Stair-7, 7, 6
Note: This Option
will be disabled in case of Straight stair and Spiral stair.
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Offsets
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Note: For
Fixed Height stairs, depending upon the
stair alignment, one of the above
"Offset" options could be
set. Whereas, for height by
Floor Constraints stairs, both
"Offset" properties are
enabled. For example, for an active floor height of
15', setting the top offset to
2', and base offset to
1', results in a stair height of
16' (i.e. 15+2-1).
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