👉Type of bar used in reinforced concrete construction:

🚧1. Main Bar

⏺The main bar (also called longitudinal bar) is the primary reinforcement placed in beams, slabs, or columns to resist tensile stresses that occur due to bending.

⏺It carries the main load.
In beams, it is placed at the bottom (tension zone) and sometimes at the top near supports.

⏺In slabs, it runs in the direction of the main span (the longer direction).

🚧2. Top Bar

⏺The top bar is the reinforcement placed at the top portion of a beam or slab.

⏺It mainly resists negative bending moments that occur over supports.

⏺In cantilever beams, the top bar is the main tension bar, because the top side of the cantilever is in tension.

🚧3. Distribution Bar

⏺The distribution bar is placed perpendicular to the main bar in a slab.

⏺Its main purpose is to distribute the load evenly and control shrinkage and temperature cracks.

⏺It helps maintain the correct spacing and supports the main bars in position.

🚧4. Negative Bar

⏺The negative bar is a type of main reinforcement placed where bending moment is negative, such as over supports in continuous beams or slabs.

💫In those regions, the top fibers are in tension, so negative bars are provided at the top side to resist that tension.

🏷In short:

⏺Main bar:- carries main tension.
⏺Top bar:- at top, resists negative moments.
⏺Distribution bar:- spreads load and controls cracking.
⏺Negative bar:-top reinforcement over supports to handle negative bending.

@etconp