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

Step 2 BM per unit width of slab