Stirrups are one of those construction elements that may seem small but are very important. Stirrups are essential as they keep the main reinforcement together closely and tightly.
The stirrups’ purpose is to provide shear resistance, especially on critical points of a structural reinforced concrete that can prevent it to buckle or crack open. Stirrups and ties give stability to your reinforced concrete element which lessens the growth of the cracks.
Unlike main rebar, which are cut straight with usually a hook in the other side, rebar are formed in different styles depending on the shape and legs. The most usual stirrup shapes are rectangular, square, diamond, circular and hoop.
While stirrups legs can be single, double, four or six legged. Wherein these shapes can be of both depending on the complexity of the structure. Another is that compared with the main rebar which are in a length of the beam, stirrups are being placed in different spacing, closer in the support and farther towards the middle.
These means that in a beam there can be multiple number of stirrups.
Because of the number of stirrups in a beam, the production of these stirrups should be fast and adequate to not have a negative time impact. A negative time impact will reflect to the cost as well as when the project will end.
Because of these reasons, it is advisable, especially on large project, to use an automatic stirrup machine.