Transcript Slide 1

Design and drawing of RC
Structures
CV61
Dr. G.S.Suresh
Civil Engineering Department
The National Institute of Engineering
Mysore-570 008
Mob: 9342188467
Email: [email protected]
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WATER TANKS
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Learning out Come
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DESIGN OF RECTANGULAR WATER
TANK RESTING ON GROUND WITH
RIGID BASE
REVISION
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RECTANGULAR WATER TANKS
RESTING ON GROUND
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Introduction
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Introduction
Design
a
rectangular
water
tank
5m x 4m with depth of storage 3m, resting
on ground and whose walls are rigidly
joined at vertical and horizontal edges.
Assume M20 concrete and Fe415 grade
steel. Sketch the details of reinforcement in
the tank
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Step1: Analysis for moment and tensile force
E
A
C
Free
a=H=3m
F
Fixed
B
D
L=5m
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b=4m
Step1: Analysis for moment and tensile force
i) Long wall:
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Step2: Design Constants
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Step3: Design for Vertical moment
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Step3: Design for Vertical moment
Spacing of 12 mm diameter bar =
113 x1000
 101 .2 mmc / c (Max spacing 3d=411mm)
1117 .54
Provide #12 @ 100 mm c/c
Distribution steel
Minimum area of steel is 0.24% of concrete area
Ast=(0.24/100) x1000 x 170 = 408 mm2
50.24 x1000
 123 .19 mmc / c
Spacing of 8 mm diameter bar =
408
Provide #8 @ 120 c/c as distribution steel.
Provide #8 @ 120 c/c as vertical and horizontal distribution on the outer face.
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Step4: Design for Horizontal moment
Horizontal moments at the corner in long and
short wall produce unbalanced moment at the
joint. This unbalanced moment has to be
distributed to get balanced moment using
moment distribution method.
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Step4: Design for Horizontal moment
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Step4: Design for Horizontal moment
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Step4: Design for Horizontal moment
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Step4: Design for Horizontal moment
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Step5: Base Slab
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The slab is resting on firm ground. Hence
nominal thickness and reinforcement is
provided. The thickness of slab is
assumed to be 200 mm and 0.24%
reinforcement is provided in the form of #8
@ 200 c/c. at top and bottom
A haunch of 150 x 150 x 150 mm size is
provided at all corners
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Detailing
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Detailing
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REVISION
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1. LAYOUT DRAWING
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Dr.G.S.Suresh
Introduction
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Drawing is the language of engineers
Structural drawings guide builders in the
construction
The guidelines given in IS 962 and SP 34
Drawings are prepared in different sizes
In large projects, the structural drawings
are of same size
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Dr.G.S.Suresh
Introduction (Contd.)
PAPER SIZE
Trimmed Size
in mm
Un Trimmed
Size (Min) in
mm
Sl. No.
Designation
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A0
841 x 1189
880 x 1230
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A1
594 x 841
625 x 880
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A2
420 x 594
450 x 625
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A3
297 x 420
330 x 450
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A4
210 x 297
240 x 330
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A5
148 x 210
165 x 240
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Dr.G.S.Suresh
Layout of Structural Drawing
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Dr.G.S.Suresh
Scale:
Plan:- 1:100, 1:50
Elevation:- 1:5, 1:30
Sections:- 1:50, 1:30, 1:25, 1:20,1:15,1:10
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Dr.G.S.Suresh
Structural Lay-Out Drawing
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Positioning and orientation of columns
Positioning of beams
Spanning of slabs
Layout of stairs
Selecting proper type of footing
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Dr.G.S.Suresh
Structural Lay-Out Drawing
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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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Dr.G.S.Suresh
Structural Lay-Out Drawing:
Column & Footing
A
B
C
D
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Structural Lay-Out Drawing
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Structural Lay-Out Drawing
A
B
C
D
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Structural Lay-Out Drawing
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DETAILING OF BEAMS
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Introduction
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Carries Transverse External Loads That
Cause Bending Moment, Shear Forces And In
Some Cases Torsion
Concrete is strong in compression and very
weak in tension.
Steel reinforcement is used to take up tensile
stresses in reinforced concrete beams.
Mild steel bars or Deformed or High yield
strength deformed bars (HYSD)
HYSD bars have ribs on the surface and this
increases the bond strength at least by 40%
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Dr.G.S.Suresh
Specification for the reinforcement in beams is given in
clause 8.1 to 8.6 of SP34
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PROBLEM No. 1 contd.
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Introduction
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Introduction
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Torsion Reinforcement
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Torsion Reinforcement
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Typical One Way slab
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Typical Two Way slab
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Dr. G.S.Suresh
Civil Engineering Department
The National Institute of Engineering
Mysore-570 008
Mob: 9342188467
Email: [email protected]
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