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Zoom in and start drawing. Since upper roof drawing is the top floor plan there in no column or shear wall above. We will draw slab and beam objects.
Drawing Slab
Click + next to Roof item on tree view
Go to Slab → Slab Edge Button
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Beam object causes error so could not be modelled for nowmodelled. Shearwall opening is modelled instead.
If reference drawings are floor plans which means it shows columns/shear walls above, you must overlay the drawing of one lower floor to draw columns and shear wall which are carrying the slab.
To draw shearwalls and columns below;
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Go to Roof → Overlay
Select Xref drawing of 8th Floor linked drawing
Unselect Roof linked drawing
Click OK
Now you see the shear wals walls and columns below.
Drawing Shearwalls
Go to Roof → Shear Walls
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Click Shear Wall to start drawing
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Draw a rectangular opening with dimensions above.
Click Show Story to go back to plan view.
We will draw the shear wall shown below different from above because this shear wall has closed shape.
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Shear walls 3D view must be as below after updated.
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Drawing Column
There is only one column above on plan.
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Since the column is rectangle but rotated you must draw it with arbitrary column command as shown below.
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Go to Roof → columns
Click arbitrary column to start drawing
Upper roof modelling is completed. 3D of upper roof is shown below.
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Modelling Of Roof
Go to 8th Floor →click Overlay
Select Xref drawing as 8th Floor Linked Drawing
Click OK