Note on Architectural requirements from NBC 205: 2012

NBC 205: 2012

READY TO USE GUIDELINE FOR DETAILINGS OF

LOW RISE REINFORCED CONCRETE BUILDINGS

WITHOUT MASONRY INFILL

Ready to use dimension details up to 3-storeyed RC building, framed and ordinary residential building.

Shall = requirement

Should = recommended

Generally, the minimum depth of exploration for a building covered by this RUD shall be 2 m. In hilly areas, exploration up to the depth of sound bed-rock, if it lies shallower than 2 m, should suffice.

A storey is used to count floors above the ground line while floors of a building include the basements as well. A 4 storey building means it has a Ground floor + 3 upper floors. Now suppose that building has 2 basements; it would still be called a 4 storey building but will consist of 6 floors.

CONDITIONS FOR DETAILED DIMENSIONS

A and B ≤ 25.0 m

A ≤ 3 x B

a x b ≤ 13.5 sq. m.

a, b ≤ 4.5 m

a, b ≥ 2.1 m

A or B ≤ 6 bays

H/B shall not exceed 3

H max = 11 m or 3 storey whichever less

Note: Within an 11 m height, there may be an additional storey of smaller plan area. The area of this shall not exceed 25 % of the area of a typical floor, as given in Figure 4.1. If this limit is exceeded, it shall be considered as an additional storey and not permitted.

The length of wings on the structure shall be restricted such that K1 and K2 shall be less than the lesser of 0.15 A or 0.15 B. The adjacent side of wing should not be lesser than ½ of K. The plan shape of building excluding wings shall be rectangular.

Where, A and B are longer and shorter sides of the building respectively.

a, b refers to bays.

H refers to the height and h to the storey

Ka and K2 refers to extended parts/bays within a building

No walls except a parapet wall shall be built on a cantilevered slab. Such walls shall be constructed only if the cantilevered slab is framed with beams.

Buildings shall not have a soft storey.

The size of cantilever projection should not exceed 1 metre.

Column Plan Bay Dimension : 3m x 3m to 4.5m x 3.0m

Bay Nos. : 2 x 2 to 6 x 6

Number of Storeys : up to three plus stair cover

Storey Height

For terai region preferred storey height = 3.35 m

For other region preferred storey height = 2.75 m