watertank 5
DESCRIPTION
Watertank 5TRANSCRIPT
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Design and drawing of RC Structures
CV61
Dr. G.S.Suresh
Civil Engineering Department
The National Institute of Engineering
Mysore-570 008
Mob: 9342188467Email: [email protected]
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WATER TANKS
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Learning out Come
• 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
B
A
F
D
C
Free
a=H=3m
b=4m
L=5m
Fixed
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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 = c/mmc 2.10154.1117
1000x113 (Max spacing 3d=411mm)
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
Spacing of 8 mm diameter bar = c/mmc19.123408
1000x24.50
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
• 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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Introduction
• 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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Introduction (Contd.)
Sl. No. Designation Trimmed Size in mm
Un Trimmed Size (Min) in mm
1 A0 841 x 1189 880 x 1230
2 A1 594 x 841 625 x 880
3 A2 420 x 594 450 x 625
4 A3 297 x 420 330 x 450
5 A4 210 x 297 240 x 330
6 A5 148 x 210 165 x 240
PAPER SIZE
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Layout of Structural Drawing
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Scale:
Plan:- 1:100, 1:50Elevation:- 1:5, 1:30Sections:- 1:50, 1:30, 1:25, 1:20,1:15,1:10
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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
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Structural Lay-Out Drawing
A
B
C
D
1 2 3 4
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Structural Lay-Out Drawing
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DETAILING OF BEAMS
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Introduction
• 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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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]