Table of Contents
Why extra bars are provided in slab?
why are crank bars provided in slabs? To resist Hogging (Negative Bending Moment) at supports. To counter the risk of the failure of the slabs. By providing the crank with the strength of the slab increased.
What are distribution bars?
Distribution bars placed on top of the main bar. Main Reinforcement bars are placed in shorter direction and Distribution bars placed in longer span direction. Main Reinforcement Bars are used to transfer the bending moment developed at the bottom of the slab.
Why is temperature bar provided?
Steel rods placed horizontally in concrete slabs for prevention of cracks due to temperature changes or drying; placed parallel to the reinforcing rods. The steel rods are placed at right angles to the main reinforcing bars.
Why We provide double reinforcement in the side of slab?
2) Doubly reinforced : When the loads acting are high and it is not feasible to increase the depth of the slab due to architectural or structural purposes, then we provide a doubly reinforced slab. Here reinforcement is provided in the compression and tension zone i.e. above and below the neutral axis.
Why bent up bars are provided?
Bent up bars are provided to counter the Shear force. As you seeing that towards the ends of the beam shear is increasing and bending moment is decreasing. We also know that longitudinal reinforcement is provided to counter the bending moment stress or flexural stress.
What is a one way concrete slab?
One way slab is a slab which is supported by beams on the two opposite sides to carry the load along one direction. The ratio of longer span (l) to shorter span (b) is equal or greater than 2, considered as One way slab because this slab will bend in one direction i.e in the direction along its shorter span.
Why temperature and shrinkage reinforcement is used in one way slab?
Temperature and Shrinkage Reinforcement Shrinkage and temperature reinforcements are provided to resist shrinkage and temperature stresses in concrete. Slabs are joined rigidly to other parts of the structure and cannot contract freely, this results in tension stresses known as shrinkage stresses.
What is the purpose of distribution bar in slab?
Distribution bar is designed to distribute the superimposed load equally or counter the Shrinkage stresses, which are developed due to Temperature variation (Winter, Summer). 3. In the Flat-plate slab, the Distribution bars are provided in one direction at the top of the main bar (in a longer span).
What is the difference between main bar and distribution bar?
1. The Main bars usually are provided at the bottom of the distribution bar in slabs, But Distribution bars are provided on the top of the main bar. 2. The Main bars are provided in the shorter span of the slabs, But Distribution bars are provided in the longer span of the slabs. 3.
Where is the main reinforcement bar provided in a one way slab?
1. Main reinforcement bar is provided at the bottom of the slab at the shorter direction. 2. Stronger dimension bar is used as main bar. In one way slab, the slab is supported by beams on the two opposite sides where main reinforcement bar is provided.
What is distribution reinforcement in slabs?
The distribution reinforcement is provided along the long span in slabs. Again, as the name suggests this is to distribute the localised loads so the concentrated stresses are reduced and more even throughout the slab. The distribution reinforcement in most cases is designed for strength .