Design and drawing of RC Structures CV61

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Design and drawing of RC StructuresCV61
Dr. G.S.Suresh Civil Engineering Department The
National Institute of Engineering Mysore-570
008 Mob 9342188467
Email gss_nie_at_yahoo.com
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Learning out Come

• Review of Lay out Drawing
• Problems on Lay out drawing of column and footing
• Problems on Lay out drawing of beams and slabs

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Structural Lay-Out Drawing

• Positioning and orientation of columns
• Positioning of beams
• Spanning of slabs
• Layout of stairs
• Selecting proper type of footing

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Structural Lay-Out Drawing

• Two axes marked one side with alphabets and the
  other with numbers.
• Columns are marked at the intersection of grids
• Beams are marked using two parallel lines
• Slabs are indicated either as one way or two way

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Structural Lay-Out Drawing Column Footing
A
B
C
D
1
2
3
4
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Structural Lay-Out Drawing
A
B
C
D
1
2
3
4
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Problem-1
Data For Column-Footing Lay out

• A clear dimension of factory floor is 11.75 m x
  19.75 m
• Spacing of columns 4m c/c
• Size of columns 250 mm x 450 mm
• Span of steel truss is 12.25 m c/c
• At the ends to support the gable wall additional
  two RCC columns of size 250 mm x 450 mm are to be
  provided at 4m c/c measured from end columns
• All the walls all-round are 250 mm thick
• Height of columns 3m
• Size of footing 1.4m x 1.8m
• Thickness of footing 300 mm uniform
• Depth of foundation 1.2m below ground level

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Problem-1
Preliminary Calculations

• External dimensions of the building
• Along X-direction 11.75 2 x 0.25 12.25 m
• Along Z-direction 19.75 2 x 0.25 20.25 m
• Centre line dimensions of the building
• Along X-direction 12.25 0.45 11.80 m
• Along Z-direction 20.25 -0.25 20.00 m

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Problem-1
Procedure

• Draw the centerline of the building having
  11,800mm along X-direction and 20,000 mm along
  Z-directions
• Mark these centre lines as grid lines A and D for
  lines parallel to Z-directions grid lines 1 and
  6 for lines parallel to X-axis
• Measure 4000mm from grid lines A and D to get
  grid line B and C
• Measure 4000mm c/c along Z-axis starting from
  grid line 1 to get grid lines 2, 3, 4 and 5
• Draw rectangular filled box of size 250mm x 400mm
  at the intersection of gird lines along A and D
  to indicate the position of column along these
  grid lines as shown in Fig.

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Problem-1
Procedure Contd.

• Draw rectangular filled box of size 250mm x 400mm
  at the intersection of grid lines 1,6 with B and
  C respectively as shown in Fig.
• Draw rectangles each of size 1400 mm x 1800mm
  symmetrically with respect to centre of column to
  indicate excavation marking for all columns. Here
  the shorter side of this rectangle box is
  parallel to the shorter side of column as shown
  in Fig. 1.8
• Sectional elevation and plan of the footing of
  column is drawn just to the right of the key plan
  drawn as shown in Fig.

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Problem-1
Drawing Key Plan
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Problem-1
Drawing Footing Details
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Problem-2
Data For Beam-Slab Lay out

• Prepare a general layout showing the positions
  and sizes of Beams and Slabs to a suitable scale
  for a Community Hall
• Clear dimension of hall is 12.05 m x 19.8 m
• Three rows of columns are to be provided along
  the width with spacing of 6 m c/c
• Six rows of columns are to be provided along the
  length with spacing of 4 m c/c
• All the walls all-round are 200 mm thick
• Size of columns 200 mm x 450 mm
• Main beams are of size 200 mm x 600 mm
• Secondary beams are of size 200 mm x 300 mm
• Thickness of slab 150 mm

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Problem-1
Preliminary Calculations

• External dimensions of the building
• Along X-direction 12.05 2 x 0.2 12.45 m
• Along Z-direction 19.8 2 x 0.2 20.2 m
• Centre line dimensions of the building
• Along X-direction 12.45 - 0.45 12 m
• Along Z-direction 20.2 -0.2 20.00 m

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Problem-1
Procedure

• Draw the centerline of the building having 12,000
  mm along X-direction and 20,000 mm along
  Z-directions
• Mark these centre lines as grid lines A and C for
  lines parallel to Z-directions grid lines 1 and
  6 for lines parallel to X-axis
• Measure 6000mm from grid lines A to get grid line
  B
• Measure 4000mm c/c along Z-axis starting from
  grid line 1 to get grid lines 2, 3, 4 and 5
• Draw rectangular filled box of size 200mm x 450mm
  at the intersection of gird lines along A and C
  to indicate the position of column along these
  grid lines as shown in Fig.

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Problem-1
Procedure Contd.

• Draw parallel lines spaced at 200mm symmetrically
  about the grid lines 1 to 6 to indicate main
  beams having effective span of 6m as shown in
  Fig. 1.9
• Draw parallel lines spaced 200 mm abutting to end
  columns to indicate secondary beams as shown in
  Fig. 1.9. Also draw 200 mm wide secondary beam
  along grid line B as shown in Fig.1.9
• Mark all the main beams as B1 and Secondary beams
  as B2
• Indicate the slab as one way slab as shown in
  Fig. 1.9 and mark the slabs as S1.

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Problem-1
Drawing Key Plan
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Problem-1
Drawing CROSS-SECTION
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Problem-1
Do it Yourself

• 1. Prepare a general layout drawing including
  the details of columns and foundation for a
  shopping complex with four shops in the ground
  floor with the following details
• Column size 230 x 450 mm
• Spacing 3.5 m c/c
• Span of the beam supported by columns 6m c/c
• Depth of foundation 1.2 m below GL
• Depth of Footing 450 mm

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Problem-1
Do it Yourself

• 2. Prepare a general lay out drawing for the
  ground floor of a community centre in a land
  measuring 35m x 50 m for the following
  particulars
• Plinth area to be limited to 450 m2 (15m x 30m)
• Height of each column 3.5m
• Size of columns 300 mm x 450 mm
• Effective span of each continuous beam 5m of
  size 300 mm x 500 mm
• Secondary beams to be provided for a span of 4m
  and of size 300 mm x 400 mm
• Plinth beam 300 mm x 400 mm all-round 0.6m above
  ground level
• Footing of size 1.2 m x 2.8 m for each column
  has its uniform thickness 600mm

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Problem-1
Do it Yourself

• 3. Prepare a key plan at foundation level of a
  community hall building. Building has an
  auditorium of clear dimensions 12m x 19.7 m.
  Corridor of 4 m wide on either side (Parallel to
  longer side) of auditorium have to be provided.
  The roofing for auditorium is AC sheets supported
  on steel trusses. The end gable walls are
  supported on wall foundations. Roofing for
  corridor is RCC slab at 3m above floor level.
  Other details are
• Clear span of roof truss 12m
• Size of all RCC columns 300 mm x 600 mm
• BBM columns of size 300 mm x 300 mm at 4 m c/c
  is to be provided in corridors to support slab
• Assume suitable foundation for RCC columns and
  BBM columns

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Summary

• Introduction to structural Drawing
• General Lay out Drawings
• Procedure for drawing column and foundation
  Lay-Out Drawings
• Procedure for drawing beam Lay-out Drawings
• Case Study on Lay out drawings
• Problems on Lay out of Column Footing
• Problems on Lay out of Beams and Slabs

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GOOD DAY
Dr. G.S.Suresh Civil Engineering Department The
National Institute of Engineering Mysore-570
008 Mob 9342188467
Email gss_nie_at_yahoo.com