Analysis and design of a multi storey reinforced concrete
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This document provides details of the analysis and design of a multi-storey reinforced concrete building project. It includes the objectives, which are to analyze and design the main structural elements of the building including slabs, columns, shear walls, and foundations. It also summarizes the building being a 12-storey residential building in Gorakhpur, India. The document outlines the various structural elements that will be designed, including flat slab structural systems, column types and design, shear wall design, and pile foundation design.
Analysis and design of a multi storey reinforced concrete
- 1. Srm University College of Engineering Civil Engineering Department Graduation Project 1 www.thetechface.com 1 Analysis and Design of a Multi-storey Reinforced Concrete Building Prepared by:- Vivek mishra 8081926916 Adviser:- Junior engineer Nm mishra Executive Engineering Nk chaudhary Fourth Semester 2010/2011
- 2. Outline 2 Objectives Summary General Approach Building Types Concrete Structural Elements Slabs Flat Slab Design of Flat Slab Columns Rectangular Columns Design of Rectangular Columns Shear walls Design of Shear Walls Foundations Pile Group Design of Pile Group Enviromental Impact Conclusion
- 3. Objectives 3 The Objectives of the Project are:- Carrying out a complete analysis and design of the main structural elements of a multi-storey building including slabs, columns, shear walls and foundations Getting familiar with structural softwares ( AutoCAD) Getting real life experience with engineering practices
- 4. Summary 4 Our graduation project is a residential building in Gorakhpur Railway division. Place:- Basti This building consists of 12 repeated floors.
- 5. General Approach 5 Obtaining an architectural design of a regular residential multi- storey building. Establishing the structural system for the ground, and repeated floors of the building. The design of column, wind resisting system, and type of foundations will be determined taking into consideration the architectural drawings.
- 6. Types of building 6 Buildings are be divided into: Apartment building Apartment buildings are multi-story buildings where three or more residences are contained within one structure. Office building The primary purpose of an office building is to provide a workplace and working environment for administrative workers.
- 8. Office buildings 8
- 9. Concrete Mixtures 9 Concrete is a durable material which is ideal for many jobs. The concrete mix should be workable. It is important that the desired qualities of the hardened concrete are met. Economy is also an important factor.
- 10. Structural Elements 10 Any reinforced concrete structure consists of : Slabs Columns Shear walls Foundations
- 11. Flat Slab Structural System 11 Flat slab is a concrete slab which is reinforced in two directions
- 12. Types of Flat slab 12
- 13. Defining properties 13 Slab thickness = 23 cm Concrete compressive strength = 30 MPa Modules of elasticity of concrete = 200 GPa Yielding strength of steel = 420 MPa Combination of loads (1.4Dead Load + 1.6 Live Load)
- 14. Flat Slab Analysis and Design Analyzing of flat slab mainly is done to find 1. Shear forces. 2. Bending moment. 3. Deflected shape. 4. Reactions at supports. 14
- 15. Flat Slab Reinforcement 15
- 16. Columns It is a vertical structural member supporting axial compressive loads, with or with-out moments. Support vertical loads from the floors and roof and transmit these loads to the foundation. 16
- 17. Types of column • Tied Columns Over 95% of all columns in building in non-seismic regions are tied columns • Spiral Columns Spiral columns are generally circular. It makes the column more ductile. Spiral column Rectangular column 17
- 18. Steel Reinforcement in Columns 18 The limiting steel ratio ranges between 1 % to 8 %. The concrete strength is between 25 MPa to 45 Mpa. Reinforcing steel strength is between 400 MPa to 500 Mpa.
- 19. Design procedure 19 1. Calculate factored axial load Pu 2. Select reinforcement ratio 3. Concrete strength = 30 MPa, steel yield strength = 420 MPa 4. Calculate gross area 5. Calculate area of column reinforcement, As, and select rebar number and size.
- 20. Columns to be designed 20
- 21. Guidelines for Column Reinforcement 21 Long Reinforcement Min. bar diameter Ø12 Min. concrete covers 40 mm Min. 4 bars in case of tied rectangular or circular Maximum distance between bars = 250 mm Short Reinforcement ( Stirrups) Least of: Asp (16)×diameter of long bars S least dimension of column (48)×diameter of ties dc
- 22. Reinforcement of Columns 22
- 23. Shear walls 23 A shear wall is a wall that resists lateral wind loads which acts parallel to the plane of the wall.
- 24. Shear walls 24 Wind results in a pressure on the surface of the building Pressure increases with height Positive Pressure, acts towards the surface of the building Negative Pressure, acts away from the surface of the building (suction)
- 25. Design of the wind force 25 North south direction
- 26. Shear wall axial reactions 26
- 27. Shear Wall Reinforcement 27
- 28. Foundations 28 Foundations are structural components used to support columns and transfer loads to the underlying Soil. Foundations Shallow Deep Isolated Combined Strap wall Raft footing footing footing footing footing Caissons Piles
- 29. Pile foundation 29 Our building is rested on a weak soil formation which can’t resist the loads coming from our proposed building, so we have to choose pile foundation. Pile cap Piles Weak soil Bearing stratum
- 30. Pile foundation 30 Piles are structural members that are made of steel, concrete or timber.
- 31. Function of piles 31 As with other types of foundation, the purpose of a pile foundation is: To transmit a foundation load to a solid ground To resist vertical, lateral and uplift load Piles can be Timber Concrete Steel Composite
- 32. Concrete piles 32 General facts Usual length: 10m-20m Usual load: 300kN-3000kN Advantages Corrosion resistance Can be easily combined with a concrete superstructure Disadvantages Difficult to achieve proper cutoff Difficult to transport
- 33. Pile foundation 33 Piles can be divided in to two major categories: 1. End Bearing Piles If the soil-boring records presence of bedrock at the site within a reasonable depth, piles can be extended to the rock surface 2. Friction Piles When no layer of rock is present depth at a site, point bearing piles become very long and uneconomical. In this type of subsoil, piles are driven through the softer material to specified depths.
- 34. Pile Cap Reinforcement 34 Pile caps carrying very heavy point loads tend to produce high tensile stresses at the pile cap. Reinforcement is thus designed to provide: Resistance to tensile bending forces in the bottom of the cap Resistance to vertical shear
- 35. Design of the pile cap 35 bearing capacity of one pile: Rs = α ⋅ Cu ⋅ As .L Length of pile penetration L = 18 meters Adhesion factor of soil (clay) α = 0.8 Untrained shear strength Cu = 50 Diameter = 0.9 m For piles with diameter 0.9 m Rs = 2035.75 KN
- 36. Columns layout & Reactions ( Vertical Load ) 36 Column Reaction Total Reaction kN kN 1 129.63 1555.56 2 246.85 2962.2 8 382.66 4591.92 10 393.38 4720.56 21 458.35 5500.2 23 400.85 4810.2 24 627.74 7532.88 25 384.14 4609.68 30 158.3 1899.6 32 355.26 4263.12
- 37. Shear walls layout & reactions 37 wall M (KN.m) N (KN) W1 14072.12 12285.6 W2 366.048 3596.76 W3 366.048 3026.88 W4 5719.5 3605.04 W5 30.65295 4128 W6 301.6143 1899.6 W10 10141.2 32.80882 W11 2402.52 32.80882 W13 20978.4 6700.246 W14 3297.6 6700.246 W15 2040 262.4706 W16 5470.2 262.4706 W17 7262.76 7903.641 W18 8571.48 7086.706
- 38. Environmental impact 38 Although the cement production is environmentally challenging, the final product of a reinforced concrete building is environmentally friendly.
- 39. Conclusion 39 We have applied our gained knowledge during our graduation project We are able to use structural software ( Auto Cad ) We have practiced real life engineering practices At this point, we would like to thank all instructors, engineers, and Al Ain Consultant Office for their grateful effort.
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