How to Design Slab Using Staad Pro

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1. 1. Structural Analysis And Design
2. 2. "What" Is Analysis? Calculation of the response of structures to actions
3. 3. INTRODUCTION TO STAAD.Pro • STAAD.Pro is a structural analysis design program software. • It includes a state of the art user interface, visualization tools and international design codes. • It is used for 3D model generation, analysis and multi-material design. • The commercial version of STAAD.Pro supports several steel , concrete and timber design codes. • It is one of the software applications created to help structural engineers to automate their tasks and to remove the tedious and long procedures of the manual methods.
4. 4. HISTORY OF STAAD.Pro • STAAD.Pro was originally developed by Research Engineers International in Yorba Linda, CA. • In late 2005, Research Engineer International was bought by Bentley Systems.
5. 5. STRUCTURE • A STRUCTURE can be defined as an assemblage of elements. STAAD is capable of analyzing and designing structures consisting of both frame, and Finite elements. Almost any type of structure can be analyzed by STAAD. Frame elements – Beam elements – 2 nodes Finite elements – 1.) Plate – 3 or 4 nodes 2.) Solid – 4 to 8 nodes • In case of STAAD Node becomes Joint it has a number and xyz coordinates Beam becomes Member it has a number and nodes at its ends Plate becomes Element it has a number and node at its corners
6. 6. TYPES OF STRUCTURE • A TRUSS structure consists of truss members which can have only axial member forces and no bending in the members • A PLANE structure is bound by a global X-Y coordinate system with loads in the same plane • A SPACE structure, which is a three dimensional framed structure with loads applied in any plane, is the most general. • A FLOOR structure is a two or three dimensional structure having no horizontal (global X or Z) movement of the structure [FX, FZ & MY are restrained at every joint]. The floor framing (in global X-Z plane) of a building is an ideal example of a FLOOR structure. Columns can also be modelled with the floor in a FLOOR structure as long as the structure has no horizontal loading. If there is any horizontal load, it must be analyzed as a SPACE structure.
7. 7. GETTING STARTED STAAD WINDOW
8. 8. TOOLS USED
9. 9. VARIOUS TYPES OF CURSORS Nodes cursor Beam cursor Plates cursor Surface cursor Solids cursor Geometry cursor
10. 10. PAGE CONTROL IN VARIOUS MODES
11. 11. Model generation and analysis Input Geometry –Nodes, Beams, Plates Input Properties Input Specs, Constant, Supports Input Loading System Specify Analysis Type Run Analysis View and Verify Results Design Verify
12. 12. MODEL GENERATION • There are basically 3 methods of generating a model 1. Snap node method 2. Coordinate method 3. Copy paste method • Out of these three methods most commonly used is copy paste method • By using these three methods a structure of any geometry can be created • STAAD.Pro also contains a command wizard which is its library of structures such as frames , trusses are present which can be merged with the STAAD.Pro model
13. 13. WIZARD
14. 14. ASSIGNING PROPERTY Assigning a property means to provide dimensions such as width, thickness etc to beams columns slabs etc
15. 15. SUPPORTS 1. There are three types of supports provided to a structure • Fixed support • Pinned support • Roller support 2. There are options provided in Staad for pinned and fixed supports while roller support has to be created by releasing the Fx and Mz components using fixed but.
16. 16. ASSIGNING LOADS • Any structure is subjected to basically these types of loads- 1. Dead load 2. Live Load • Dead load includes the self weight of the structure while live load consists of superimposed load. • In addition to a structure is also subjected to wind and seismic or earthquake forces • While designing a structure subjected to wind and earthquake forces we also have to provide definitions along with various load cases
17. 17. • •After creating various load cases we have to assign them to the structure . For this we have to first select that part of the structure on which load has to be assigned and then assign it to that part
18. 18. Continued… • In case of structures subjected to wind and earthquake forces wind and seismic definitions need to be provided. • After providing these definitions only the load cases should be entered.
19. 19. ANALYSIS • After all the above stated steps a structure has to be analyzed. • Analysis of a structure means to find out the reactions and displacements and deflections at various nodes of a structure. • After analysis we are able to see shear moment and deflection for each member.
20. 20. After performing analysis another window which contains a report of analysis gets opened . This window shows the warnings and errors which might have occurred.
21. 21. Continued… • In the post processing mode we are able to see the reactions, displacements, deflections, shear force and bending moments for various members
22. 22. DESIGN • After analysis a structure has to be designed to carry loads acting on it considering a certain factor of safety . • In India structures are designed by using various Indian codes for both concrete and steel structures. • The design in STAAD.Pro supports over 70 international codes and over 20 U.S. codes in 7 languages. • After designing the structure it is again analyzed and results of analysis for each beam and column is shown in the output file
23. 23. STATEMENT OF THE PROJECT • 1.Utility of building :Residential building • 2.No of storeys :G+4 • 3.No.of staircases :5 no's • 4.Shape of the building :rectangular • 5.Type of construction : R.C.C framed structure • 5.Type of walls :brick wall
24. 24. Geometric details: • Ground floor :3.0M • Floor height :3.0M • Height of plinth :1.5M from below foundation • • Depth of foundation :500MM
25. 25. Material details: • Concrete Grade : M25 • All steel grade : Fe500 grade • Type of steel bars : HYSD • Bearing capacity of Soil : >180 KN/M2
26. 26. DIFFERENT TYPES OF LOADS ON THE STRUCTURES • Dead loads • Imposed loads • Wind loads
27. 27. DIFFERENT TYPES OF LOADS ON THE STRUCTURES • Dead loads • Imposed loads • Wind loads
28. 28. Dead loads • Involves self weight of • RCC slab • Beams & columns • Plinth • Walls
29. 29. Imposed loads • Imposed also known live loads • Loads over the floor i.e. Load of persons it is calculated as 1 KN/m2 • This load is applied over the length of structure
30. 30. Wind loads • Wind is air in motion • Wind loads are calculated according to IS:875(part 3) • Intensity of wind and exposure are applied in the direction as required
31. 31. Load combinations • The structures should be analysed for combination of loads as in practice we have numbers of loads in various directions act • Some of the combinations to be checked are • 1.5(DL+LL) • 1.5(DL+WL) • 1.5(DL+LL+WL)
32. 32. OBJECTIVES OF STRUCURAL DEIGN • Structure designed should satisfy the criteration of ultimate strength. • Structures should satisfy the servicablity • It should satisfy the stability against overturning, sliding, and buckling
33. 33. The main objective of the design are • Foundation design • Column design • Beam design • Slab design
34. 34. DESIGN PRINCIPLE, ASSUMPTION AND NOTATION ASSUMED • The notation adopted through out the work is same as in IS 456-2000 • Using partial safety factors for loads in accordance with clause 36.4 of IS 456-2000 • Partial safety factor for material in accordance with clause 36.4.2 IS456-2000 is taken as 1.5 for concrete and 1.15 for steel • Using partial safety factors in accordance with clause 36.4 of IS 456-2000 combination of load • (D.L+L.L) 1.5 • (D.L +L.L+W.L) 1.2
35. 35. Density of materials used MATERIAL Density 1.Plain concrete 24.0 kn /m3 2.Reinforced 25.0 k /m3 3.Flooring material(c.m) 20.0kn/m3 4.Brick masonry 19.0kn/m3 5.Fly ash 5.0kn/m3 LIVE LOADS: In accordance with IS 875-86 1.Live load on slab =3.0kn/m3 2.Live load on passage =3.0kn/m3 3.Live load on stair =3.0kn/m3
36. 36. Structural design • For slab, depth is 125 mm provided. • For beams, after calculations are done . the dimensions of beam is 230*530mm factored load on beam is 15.87kn/m
37. 37. • Shape of column is rectangular • For columns, the dimension of column is 300*600mm • Factored load on column 1090.10kn • For footings, the bearing capacity of soil is 175kn/m2 • To provide the dimensions of footing is 12.5m*2.7m
38. 38. ANALYSIS • Analysis is done using STAD PRO developed by BENTLEY • Once the loads and load combinations are assigned to the structures, analysis is to be done • Analysis is done for RCC structure
39. 39. Assign the properties of structures
40. 40. ASSIGN LOADS ON THE SLAB
41. 41. LOAD ASSIGN ON THE WALLS
42. 42. ASSIGN WIND LOAD ON THE STRUCTURES (X+VE DIRECTION)
43. 43. ASSIGN WIND LOAD ON THE STRUCTURES (X-VE DIRECTION)
44. 44. ASSIGN WIND LOAD ON THE STRUCTURES (Z +VE DIRECTION)
45. 45. ASSIGN WIND LOAD ON THE STRUCTURES (Z -VE DIRECTION)
46. 46. CONCLUSIONS: • The design of slab, beam, column, rectangular footing and staircase are done in limit state method which is safe at control of deflection and in all aspects • Using staad.pro software, the design consideration has been taken as per the is codes. The design is safe in all conditions • On comparison with drawing, manual design and the geometrical model using staad.pro the area of AST required for the beam, column, footing and slab are comparatively similar to that of the requriment
47. 47. ADVANTAGES OF STAAD.Pro Following are the advantages of STAAD.Pro 1. Covers all aspects of structural engineering 2. Broad spectra of design codes 3. International codes 4. Quality assurance 5. Reports and documentation
48. 48. Firms • Structural engineering • Structural consultant • Multi-discipline E/A and A/E • Departments in construction companies, owner/operators, and government agencies
49. 49. CONCLUSION • Staad pro is widely used by most of the organization for their construction needs. • Unfortunately, well skilled staad pro engineers are very hard to search. • If we believe in the prediction of the industry experts then those students who will be getting trained on staad pro in the current and upcoming two years will have bright and successful career ahead in the real estate and construction domain • By attending this training in STAAD.Pro we were able to learn various features of STAAD.Pro which will be very helpful in the near future

How to Design Slab Using Staad Pro

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