Sitructural Details of Super Structure
01. Typical Bar Notation
02. Concrete Outline Drawing
In structural drawings, a Concrete Outline Drawing (also called Slab General Arrangements) is a technical
drawing that shows the shape, size, and layout of concrete structural elements such as:
• Columns
• Beams
• Slabs
• Staircases
It focuses only on the concrete parts, before reinforcement and other construction details are added.
Check List for Concrete Outline Drawing
• Grid with Dimentions
• Concreted Area (Outline)
• Voids (Ducts)
• Staircase
• Level Drops
• Columns with names
• Beams with names
• Table for Column and Beam Sizes
• Sections
• Slab Symbole ( 1 way span, 2 way span)
• Slab thickness
• Elevation of the slab
• Secondary Concreting parts
• Beam denoting from bottom to top , and after that left to right.
Add Staircase Like This
Washroom Level Drop
• How can we see that without R/F
Drainage Pipe
• Dranaige Pipe arrangement for water closet
• For the Dranaige Pipe of squatting pan, can be placed through the beam or through the slab as per
the instructions of structural engineer.
Waste water Pipe
R/F Supporting Symbole
01. Cantiliverd Slab
� Simply Supported Edge
• The slab rests freely on a beam or wall.
• R/F supporting on the beam.
• No moment resistance at the edge.
• Reinforcement does not need to be bent up or continued far beyond the support.
02. One way Supporting Slab
� Fixed or Continuous Edge (Full Support)
• The slab is supported monolithically with the beam or wall.
• Moment resistance is expected at the edge.
• R/F supports on two beams. (top and bottom)
• Top and bottom reinforcement are extended or hooked.
• Used in slabs poured together with beams or frames.
03. Two way Supporting Slab
� Slab Supported on All Four Sides (2-Way Slab)
• This symbol is often used to indicate a 2-way slab behavior.
• All four edges are supported (like the edges of a room).
• R/F supporting for 4 directions.
• Load is distributed in two directions, and reinforcement is placed in both directions.
04. Slab pannel
• Normally slab is like this.
• When add a load it will deform like this.
• Skin will try to break from critical points.
• Therefore we must add R/F
• Breaking Points of top side
• To avoid the breaking we must add R/F
• Typical R/F arrangement. (for the middle of the slab no need R/F)
• If the bar length is not enough to cover the slab, we have to lap the R/F. maximum length of
a bar is 6m. If it is exceeds, we should lap.
• Therefore, we can add an U bar.
Length of the top R/F
• One third (1/3) or (0.3) from the span. (In between the beam edges)
R/F detail for the bar mark of 20
• Sectional View from one direction
• Sectional View from the other direction
B1 – Nearest bar to the bottom – Comes for shorter span
T1 - Nearest bar to the top - Comes for shorter span
05. Cantiliver Slab
• Cantilever slab bends like this.
This T1 can become B1.
• If the total bar exceeds 6m. (original bar length is 6m)
• Need to add a lap and continue the slab r/f.
• Do not add a lap in critical points.
Typical bar arrangements of cantilever Slabs
How to avoid cracks (defects) in cantilever slab
• Increase the slab thickness
• Add more R/F
06.Beams
