Reinforcement detailing of RCC slab openings.
Many times opening are required to be provided in reinforced concrete slab
in building to be provide way for lifts, or cables, ducts or other instrument
to pass through one floor to other floors mainly in the case of industrial
buildings.
Detailing of opening in slabs is based on factors like size of opening,
loads on slabs, floor vibration etc... In the case of large openings it is
desirable to place beams under the opening area so that no additional detailing
of slab reinforcement is needed and load is directly transferred to main beams
through secondary beams.
Small opening in slabs.
Where opening are small and less than 150mm in larger dimension, with no
special loading or vibration condition of slabs, additional reinforcement is
not required.
Slab opening 150mm to 900mm
For slabs with opening more than 150mm and less 900mm, at least one half
the quantity of main steel reinforcement intersected by the opening is provided
parallel to the main reinforcement bars.
Reinforcement bounded system for different slab openings;
(Timer bar placing )
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