What is the function of stirrup in beam?

Here, I am gonna discuss some use of stirrup in reinforcement. The important purpose of the stirrup is to hold the primary reinforcement bars properly.

The stirrup prevents columns and beams from buckling phenomena.

The stirrups get placed diagonally when there are tension and compression caused by vertical and transverse tension.

Thank You.

Purpose

1. It gives shear strength to the beam.
2. It gives confinement to the beam & increases its comp strength.
3. It prevents the movement of main bars at the time of concreting.
4. It enhances ductility.
5. It resists lateral shear.
6. It gives stability to the r/f.
7. It prevents bucking of member & also of individual bars.

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. Stirrups are sometimes placed diagonally and often vertically as well. This is done to prevent shear failure which is usually diagonal in case of cracks in beams. The primary reason for the diagonal shear is due to compression and tension caused by transverse and vertical tension. Eventually diagonal tension occurs since concrete is stronger in compression as compared to tension. This tension is bound by steel stirrup which holds the cracked surface together.

Stirrups are mainly provided for holding the main reinforcement of beam. It prevents the buckling of beam and also protect the RCC structure during seismic activity. Stirrups providing protection against flexural and shear failure as shown in figure.

1. Carries a portion of flexural factored shear force.
2. Restrict the growth of diagonal cracks.
3. Hold the longitudinal reinforcement bars in place.
4. Provide some confinement to the concrete in the compression zone if the stirrups are in forms of closed ties.