Table of Contents
How reinforcement is provided in slabs?
In one way slab main reinforcement is parallel to shorter direction and the reinforcement parallel to longer direction is called distribution steel. In two way slab main reinforcement is provided along both direction. Slabs could be simply supported, continuous or cantilever.
Why do we provide main steel in shorter span?
Main reinforcement bar is provided at the shorter span direction in order to transfer the bending moment developed at the bottom of the slab. The purpose of providing main bar is to transfer the bending load developed at the bottom of the slab to the beams.
Why doubly reinforced is necessary?
Doubly reinforced beam is provided to increase the moment of resistance of a beam having limited dimensions. Minimum compression reinforcement is provided to hold the Shear Reinforcement (stirrups) in position and for increasing the ductility of beam.
In which slab main steel reinforcement are provided along both the span?
In a one-way slab, the main reinforcement is provided in a short span and distribution reinforcement is provided in a long span. In a two-way slab, the main reinforcement is provided in both directions. In a one-way slab, the crank is provided in two directions.
Why distribution reinforcement is provided in one way slab?
As the slab is inflexibly fixed at the ends, this shrinkage will be limited by the support, which will prompt liable tensile stress in the slab. As the concrete is weak in tension, to take care of these tensile force distribution, reinforcement is given.
What is the main reinforcement in a concrete slab?
As the name suggests the main reinforcement is the one that takes the tensile stresses resulting from critical bending. This is provided along the short span of slabs since the critical bending happens along the shorter span. Without main reinforcement the slab will not have sufficient design strength.
Why is the load transferred through the short span of slab?
The load transferred to supporting beams through the short span of the slab is heavier than the load transferred through the long span of the slab. For a one way slab, the slab is analysed as a beam of unit width , and the main reinforcement is provided parallel to the short span, while distribution bars are provided parallel to the long span.
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 .
What are the characteristics of one way slab?
One way slab usually have a rectangular plan and tend to bend along the direction of shorter span (if we assume the direction of longer span as y – direction and shorter span as x- direction, the slab tends to bend along x – direction) so main reinforcement is provided along the shorter span and a distribution reinforcement along the longer span.