1. 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: gss_nie@yahoo.com

2. 2 WATER TANKS

3. 3 Learning out Come DESIGN OF RECTANGULAR WATER TANK RESTING ON GROUND WITH RIGID BASE REVISION

4. 4 RECTANGULAR WATER TANKS RESTING ON GROUND

5. 5 Introduction

6. 6 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

7. 7 Step1: Analysis for moment and tensile force E B A F D C Free a=H=3m b=4m L=5m Fixed

8. 8 Step1: Analysis for moment and tensile force i) Long wall:

9. 9 Step2: Design Constants

10. 10 Step3: Design for Vertical moment

11. 11 Step3: Design for Vertical moment

12. 12 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.

13. 13 Step4: Design for Horizontal moment

14. 14 Step4: Design for Horizontal moment

15. 15 Step4: Design for Horizontal moment

16. 16 Step4: Design for Horizontal moment

17. 17 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

18. 18 Detailing

19. 19 Detailing

20. 20 REVISION

21. Dr.G.S.Suresh 21 1. LAYOUT DRAWING

22. Dr.G.S.Suresh 22 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

23. Dr.G.S.Suresh 23 Introduction (Contd.) Sl. No.Designation Trimmed Size in mm Un Trimmed Size (Min) in mm 1A0841 x 1189880 x 1230 2A1594 x 841625 x 880 3A2420 x 594450 x 625 4A3297 x 420330 x 450 5A4210 x 297240 x 330 6A5148 x 210165 x 240 PAPER SIZE

24. Dr.G.S.Suresh 24 Layout of Structural Drawing

25. Dr.G.S.Suresh 25 Scale: Plan:- 1:100, 1:50 Elevation:- 1:5, 1:30 Sections:- 1:50, 1:30, 1:25, 1:20,1:15,1:10

26. Dr.G.S.Suresh 26 Structural Lay-Out Drawing Positioning and orientation of columns Positioning of beams Spanning of slabs Layout of stairs Selecting proper type of footing

27. Dr.G.S.Suresh 27 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

28. Dr.G.S.Suresh 28 Structural Lay-Out Drawing: Column & Footing A B C D 1234

29. Dr.G.S.Suresh 29 Structural Lay-Out Drawing

30. Dr.G.S.Suresh 30 Structural Lay-Out Drawing A B C D 1234

31. Dr.G.S.Suresh 31 Structural Lay-Out Drawing

32. 32 DETAILING OF BEAMS

33. Dr.G.S.Suresh 33 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%

34. 34 Specification for the reinforcement in beams is given in clause 8.1 to 8.6 of SP34

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41. 41 PROBLEM No. 1 contd.

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53. Dr.G.S.Suresh 53 Introduction

54. Dr.G.S.Suresh 54 Introduction

55. Dr.G.S.Suresh 55 Torsion Reinforcement

56. Dr.G.S.Suresh 56 Torsion Reinforcement

57. Dr.G.S.Suresh 57 Typical One Way slab

58. Dr.G.S.Suresh 58 Typical Two Way slab

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65. 65 Dr. G.S.Suresh Civil Engineering Department The National Institute of Engineering Mysore-570 008 Mob: 9342188467 Email: gss_nie@yahoo.com