Why are stirrups placed in RCC?

Stirrups are provided to hold the main reinforcement rebars [1] together in an RCC structure. Stirrups are placed at proper intervals to beams and columns to prevent them from buckling. Also, they protect RCC structures from collapsing during seismic activities (earthquakes).

Why is steel reinforcement placed towards the bottom of a reinforced concrete suspended slab?

Structural reinforcement is typically placed in the bottom portion of the slab thickness to increase the slab’s load capacity.

Where will be the reinforcement of slab placed when there is an inverted beam and the bottom of the beam and slab are at same level?

Edit: Considering the slab continuous between supporting inverted beams (flush with the bottom of the inverted beams) and subjected to gravity loads, portion of the slab near the inverted beams has tension at top and so tension reinforcement will go at the top.

Why steel is used in RCC reinforcement?

Steel is commonly used as good reinforcing material because of the following reasons: Steel is highly ductile material. It can deform without losing its toughness. Young’s Modulus of elasticity of steel is equal in both tension and compression.

Why are stirrups provided in beams?

The main aim of providing stirrups in beam is to hold the main reinforcement rebars together in RCC structure. They are provided at proper intervals to beam and columns for preventing them from buckling. Stirrups also protect the RCC structures from getting collapsed during earthquakes.

Where is lapping provided in beam?

The lapping zone for the top bars should be at the mid- L1/3 or L2/3 part of the beams. Reason: The top bars fall under the compression zone of the beam. For the compression zone, the mid-1/3 span of the beam is said to be a safe zone for lapping.

Why inverted beam is provided?

Inverted beams are provided to avoid it’s view in porch area or to have more head as per requirements. The girders provided for foot over bridges in railway stations are good examples of inverted beams. The girders are made inverted to get clear height available for electric wires and train.