This 28 minute lesson teaches the basics of creating and configuring a stair for placement into the model. This is a complex topic, so only one stair type (a straight run) is demonstrated, but other styles of stair objects will function in a similar manner.
The Stair tool is similar to the Object tool, in that it allows the user to choose from a variety of basic stair objects with different shapes and capabilities. Each one will have some similarities to the others, but some unique features including geometry and editing options. It is important to select the basic stair shape or style first, then start setting the overall parameters such as height (which will equal the height to next story in the Story Settings dialog, or be that value less the height of one stair riser), width and length. To calculate the overall size for the stair, sometimes it is useful to show the upper story’s floor plan as a Trace Reference; simply right-click on the upper floor in the Project Map or one of the Views of that floor in the View Map, and choose Show as Trace Reference.
You can turn the reference off and on as you work by clicking the Trace Reference button in the Toolbar, and change its color and opacity to suit your needs with the Trace Reference palette (available from the pull-down menu next to the main button). In most of the stair objects, there will be a choice of setting the overall parameters manually, or basing them on the number of risers multiplied by the tread length and height. In each case, one set of values is editable, and the other set is calculated accordingly.
Other values may be adjusted after the basic geometry is determined, including whether there are railings on one or both sides or neither side, and what style the railing will be. In addition, many 2D options will be configurable including whether the stair should be seen on more than one story (set by the Show on Stories parameter), how it should be seen on the upper story (which may be different than on the lower story if the the Story Sensitive checkbox is activated), and how the directional arrow, labeling and break-lines will appear.
Aside from the Show on Stories option (which is set in the Floor Plan and Section panel), the other settings may be inspected and adjusted in the Parameters panel (the text-based list of values) or the Stair Settings panel (the graphical editing area that has multiple subsections). Often, an upper floor slab will need to be cut in order to accommodate the stair. To do this, select the slab and press down on an edge or corner and select the Boolean Subtract option from the pet palette (it has a little “minus” sign). Then click to delineate the boundary, and the hole will be cut out from the slab.
To see how the stair fits into the context of the model, use the marquee tool with the heavy border option to outline the area, then right-click and select “Show Selection/Marquee in 3D” to view a cut out piece of the larger building that shows the stair and nearby elements only.
NOTE:There is a different method for creating stairs that is briefly referred to that uses StairMaker, a separate application called up from within the Stair tool using the Create Stair button. StairMaker allows more complex stair configurations to be created. In earlier versions of ArchiCAD, the command to bring up StairMaker is activated from the popup menu accessed from a small triangle icon in the upper right of the Stair Settings dialog box.
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