RCC Building Design Manually.
Let's Design for a typical plan of a 2BHK.
Only take dead and live loads. Add wind loads and seismic loads according to zone after practicing with the dead and live load.
The idea is simple- Slab rest on beams, Beams rest on columns and Columns rest on footings. So design slab first, then use the load from load to design beams. Beams will put the load on columns. And columns on Footing.
Prerequisite:
- Architectural Plan
- Is codes-456,875 / ACI codes / BNBC codes.
- Soil report
- Scientific Calculator
- Mark Columns
- Join columns to mark primary beams. There Will be tertiary beams resting on primary beams.
- Mark all beams. Number them.
- Now mark slabs.Slabs with similar dimensions will be marked the same.
- Design slabs. Use load is:875/ACI/BNBC . Find the depth and area of steel.
- Now beams will be calculated each individually. First let's calculate for tertiary beams i.e beams resting on other beams. assume the depth and width of all beams are 500 mm and 300 mm respectively. draw force dia for each beam
- Slab load :- two way slab load on the beam of length I=WL/3. Calculate slab load intensity for all 4 beams on which 2 way slab is resting. Unit in KN/m(UDL). For one way slab WL/2 for the beams supporting the slab.
- Wall load intensity: The density of wall is 18 KN/m3. Multiply by the height of the wall. Assume wall height 2.5m and width 300mm for external and 230mm for internal. Multiply by 1.5. Now wall intensity is in units KN/m (UDL)
- Weight of concrete Self weight x Density(25KN/m3)
- Self weight width beam x Height of beam = 500mm x 0.5mm x 0.3mm
- Weight of concrete 25 x 0.5 x 0.33 x 0.75 x 1.5 = 5.62 KN/m .
- Find the area of steel at the top and bottom.
- Columns: Assume dimension 500mm x 300mm. Use moments and reaction from beams resting on the columns and find the area of steel. Don't forget to add the columns self weight.
- Net load from columns will be used to design footings.
- Detailing: Detailing of steel as per SP 34
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