Why stirrups are provided alternatively?

Stirrups in RC beams help in three ways, namely (i) they carry the vertical shear force and thereby resist diagonal shear cracks (Figure 2b), (ii) they protect the concrete from bulging outwards due to flexure, and (iii) they prevent the buckling of the compressed longitudinal bars due to flexure.

Why are hooks used in stirrups?

Hooks are provided for to resist seismic movement. To prevent concrete from splitting outward. It prevent slippage of steel from the concrete. To Keep longitudinal steel bars in position and hold steel tightly.

What are different types of hooks provided in reinforcement?

As per standard ACI 318-11, Section 7.1, there are three types like 90-degree hooks (those contain a 12-bar diameter extension on the “hook” leg pin to end), 180-degree hooks, and “Stirrup and tie” hooks (those contain a 6- to 12-bar diameter extension on the “hook” leg pin to end, based on bar diameter).

What is the purpose of stirrups?

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.

Why is a screw hook provided in stirrups?

Hook is provided in stirrups for the following reasons: To prevent from buckling of column. The main requirement for safety against bond failure is to provide a sufficient extension of the length of the bar beyond the point where the steel is required to develop its yield stress and this length must be at least equal to its development length.

Why do we use stirrups on the beam and column?

To secure the beam and column from the buckling and shear failure. The stirrups are resisting the rods under compression or tensile force. The spacing of stirrups will be different based on the design for both column and beam. The minimum spacing is 100mm and the maximum is 250mm, based on the diameter and number of the rod.

How far apart should the stirrups be on a column?

The stirrups are resisting the rods under compression or tensile force. The spacing of stirrups will be different based on the design for both column and beam. The minimum spacing is 100mm and the maximum is 250mm, based on the diameter and number of the rod. Types of Stirrups.

What is the bend length of stirrup?

The bend length defines “the length you will need to add to the actual leg lengths of the part in order to get the flat pattern cut to a correct size”. Q:- Calculate the cutting length of the stirrups given in fig 1.