Rcc Roof Slab Extension

Due to the structural condition the slab will have negative bending moment causing tension at the support on top.

Rcc roof slab extension.

Roof on masonry wall and projecting outside the building. The projecting portion of the slab is cantilever with free support on the masonry wall. Let us take an example of a slab. Beside this the slab has following information for main bars length of on rod 7 meter diameter 12 mm.

An extra floor was required to be constructed which involved converting the original roof slab to a floor slab thereby increasing the live load capacity to 3 kn m 2. Q the length and breadth of slab is 10 meter and 7 meter respectively. You get leakage problems during rain due to formation of cold joint. The design of the upper storey extension was a lightweight strut frame structure and after calculations were undertaken it was shown that the slab could not sustain the additional live load.

The construction of the original building consisted of a reinforced concrete frame with cast in situ trough floors. Hf the area of steel or the steel per square foot. Numecal for rcc roof slab steel calculation. It s better not to extend.

2 the construction uses rcc pillars. Your slab strength reduces on breaking a portion to attach new part. Precautions to be taken during construction of r c c. Before expanding an existing rcc slab first you have to check the reinforcement ratio used in the slab because a slab is designed on basically two parameters the crushing strength of concrete i e.

This requires joining the old rcc roof to the new one the details are 1 the frontage is about 80 feet accross the wall at the edge is 9 inch thick. To get a rough idea for the construction cost you can get a hint from this formula however in general it is assumed that to construct an rcc roof slab the approx cost would be rs 180 to 200 00 per sq ft where the cost for steel labor shuttering and material is included. Which is ruling the slab thickness or depth.