Project 1
Aim & Introduction - To design a multi-story Residential Building located in Bangalore using STAAD Pro Connect Edition.
Procedure
Unit weight of the materials
Reinforced Cement Concrete = 25 kN/m^3
Plain Cement Concrete = 24 kN/m^3
Cement Concrete Screed = 20 kN/m^3
Cement Masonry Units = 22 kN/m^3
Structural Steel = 78.5 kN/m^3
Soil = 18 kN/m^3
Dead Load
Floor slab
Slab weight = 3.75 kN / m^2 (0.15m x 25kN / m^3)
Partitions = 1.5 kN/m^2
Floor Finish = 2.5 kN/m^2
Miscellaneous = 1 kN/m^2
Total Floor Load = 8.75 kN/m^2
Roof slab Slab weight = 3.75 kN / m^2 (0.15m x 25kN/m^3)
Insulaions and Water Proofing = 0.5 kN / m^2
MEP Services = 0.5 kN/m^2
Miscellaneous = 0.5 kN/m^2
Total Roof Load = 5.25 kN/m^2
Live Load
Floor slab
Common Corridor = 3 kN/m^2
Total Floor Load = 3 kN/m^2
Roof slab Accessible Roof = 1.5 kN/m^2
Total Roof Load = 1.5 kN/m^2
Title
Design of Slab (IS 456)
Span Shorter Direction (Clear) ly = 3.125 m
Span Longer Direction (Clear) lx = 5.50 m
Live Load on the Slab LL = 3.00 kN/m^2
Compressive stength of concrete fck = 25 N/mm^2
Yield strength of steel fy = 415 N/mm^2
Unit weight of concrete Yc = 25.00 kN/m^3
Unit weight of floor finish 100 mm Y = 22.00 kN/m^3
Clear concrete cover = 25.00 mm
Bearing of slab B = 250.00 mm
Step 1 CL 24.1
Span to effective depth ratio l/d = 32
Minimum effective depth d = 97.66 mm
Overall depth D = 127.66 mm
Provide Overall depth D = 150.00 mm
Dia of bars for short direction ø = 10 mm
Dia of bars for long direction ø = 10 mm
Effective Depth d = 120 mm
Loading on the slab
Dead Load of the slab (DL) = 3.75 kN/m^2
Super Dead Load = 5.00 kN/m^2
Live Load on the slab = 3.00 kN/m^2
Total Load on the slab (TL) = 11.75 kN/m^2
Design Load = (Total Load x Load Factor i.e. 1.5) = 17.63 kN/m^2
Effective Span lx = 3.25 m
ly = 5.62 m
Ratio ly/Ix = 1.732 m Two Way
T26/27
| 1.5 | αx | 1.75 | αy | |
| For negative moments (at top) | 0.075 | 0.104683 | 0.107 | 0.084 |
| For positive moments (at bottom) | 0.056 | 0.103307 | 0.107 | 0.063 |
Step 2 BM per unit width of slab
| Mx = αx * w*lx^2 | My = αy * w*lx^2 | |
| For negative moments (at top) | 19.43 | 15.59 |
| For positive moments (at bottom) | 19.17 | 11.69 |
| Shear force V, 0.5w/lx | 28.60 |
