What are distribution bars in a one way slab?
The reinforcement bars that are placed above the main bar in a one-way slab, to distribute the superimposed load to the main bar are called distribution bars. As you can observe in the above drawing, distribution bars are provided in the longer span of the one-way slab & main bars are placed along the shorter span of the slab.
What is the difference between main bars and distribution bars?
Difference Between Main Bars and Distribution Bars Main reinforcement normally used at the bottom of the slab. 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.
What is the diameter of the main bar on a slab?
Main bars are always placed at the bottom part of the slab reinforcement and distribution bars rest over the main bar as shown in the above drawing. The diameter of the main bar should not be less than 8mm for the HYSD bar and 10mm for plain bars.
What is the purpose of providing main bar in a slab?
The purpose of providing main bar is to transfer the bending load developed at the bottom of the slab to the beams. 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.
Where are the cranked bars located on a slab?
What happens when a bar bends at the bottom of a slab?
Do distribution bars transfer bending loads?
Differences among main and distribution bars - quantity-takeoff
Sami Ullah, the renowned engineer, presents an useful construction video tutorial where he briefly explains what is main and distribution bars in the slab as well as variations among them with regards to bending moment and shear stress.
What is distribution bar?
The term distribution bar is sometimes used for the top reinforcement of all types of slabs. But in actuality, it is not correct in the case of a two-way slab as the load is transferred in both directions. So in the two-way slabs, the reinforcement provided in both the Lx & Ly directions should be called main bars.
What is the function of distribution bars?
The distribution bar helps to firmly hold the main bars in their assigned position. They also act against shrinkage stresses due to temperature variations.
What is the term for the reinforcement bars that are placed above the main bar in a one way slab?
The reinforcement bars that are placed above the main bar in a one-way slab, to distribute the superimposed load to the main bar are called distribution bars.
Where are the main bars on a slab?
Main bars are always placed at the bottom part of the slab reinforcement and distribution bars rest over the main bar as shown in the above drawing.
What is the term for the reinforcement bars that are placed in the tension zone of the slab to resist the bending moment?
The reinforcement bars that are placed in the tension zone of the slab to resist the bending moment & to transfer the superimposed loads to the supports that are provided for the slab are called main bars.
Where are the cranked bars located on a slab?
So to resist the bending moment developed in the shorter span at the middle bottom & top of the support, the main bars (cranked bars) of larger size are provided at the bottom of the slab.
What happens when a bar bends at the bottom of a slab?
That means when the main bar bends at the bottom, it makes the concrete crack at the bottom of the slab.
Do distribution bars transfer bending loads?
Distribution bars, on the other hand, do not transfer any bending loads to the support. It is only provided there to resist the shear stress and slab cracks that are resulted by the main bar load distribution. That means when the main bar bends at the bottom, it makes the concrete crack at the bottom of the slab.
