Hidden beam is a reinforced concrete beam, also known as a Concealed Beam or slab beam.
It is provided throughout the depth of supporting slab, so the depth of the hidden beams is proportional to the depth of the slab.
Concealed beams are a popular and necessary part of modern reinforced concrete frame structures.
Finally, strict and rigid architectural considerations led to the provision of hidden beams.
The concept of these beam originated from a flat slabs concept.
Purpose of Slab Beam (Hidden Beam, Concealed Beam):
- This helps in removing the load applied on the slab i.e. the weight of the brick masonry wall.
- Also, allows the slab to be used for longer periods.
- These beams are provided exclusively for architectural aesthetic purposes in the interior of the building.
- It improves architectural aesthetic appearance by providing a clean and flat roof surface.
- Also, break a wide panel of slabs into considerable size.
- It is used around cutouts.
- To achieve maximum floor height.
- To clear the way for electrochemical duct-work.
- This saves the height of the floor.
- This allows whether the brick construction needs to be built above the slab.
How to Design a Slab Beam?
The design of a hidden beam is similar to a conventional beam, but its depth is restricted and should not have too much slabs thickness.
Subsequently, reinforcement and width of the beam might need to be elevated to overcome this restriction to some extent.
Advantages of Slab Beam (Hidden Beam, Concealed Beam):
- The hidden beam can clear the way for the electromechanical duct-work, economical and aesthetic look by offering flooring height.
- This is mostly applicable in commercial buildings.
- It is economical as it saves material, formwork and labor costs.
Disadvantages of slab beam (Hidden Beam, Concealed Beam):
- The hidden beam has a significantly lower ductility due to the height reinforcement ratio that is specifically provided to compensate for the depth restriction on column connections.
- This poses a widespread problem because the spans are at right angles to the structural support.
- This means that one slab is structurally resting on another.
Uses of Slab Beam:
- The hidden beam simply means spreading the concentrated load of the walls over the slabs area.
- Hidden beams are usually inserted inside suspended slabs where the thickness of the slab is considerable.
- Hidden beams between the dining and living spaces are given to each other between right angles.
- It gives a clean and level roof surface which is good to see.
The hidden beam is not a beam, mostly used for spreading the concentrated load of the walls over the slab area.