Why main reinforcement is provided along shorter span in one way slab?

To provide adequate support to the longer side, the main reinforcement bars are provided parallelly to the shorter side and the distribution bars are provided on the longer side which won’t help in carrying the load. In the above slab, Larger span/Shorter span = Lx/Ly = 4500/2000 = 2.5 Which is > 2.

In which direction the main reinforcement will be in one way slabs?

As we all knows that main reinforcement in one way slab will be along shorter direction and in two way slab main reinforcement will be along both direction.

What is main reinforcement in slab?

Main reinforcement normally used at the bottom of the slab. Main Reinforcement Bars are used to transfer the bending moment developed at the bottom of the slab. Distribution Bars are used to hold the slabs on either way and to resist the cracks and shear stress developed at the top.

How is reinforcement placed in slab?

Structural reinforcement is typically placed in the bottom portion of the slab thickness to increase the slab’s load capacity. Most structural slabs-on-ground have both top and bottom layers of reinforcement for controlling crack-widths and increasing load capacities.

Why shrinkage reinforcement is provided in slab?

ACI 318 Commentary states that “Shrinkage and temperature reinforcement is required at right angles to the principal reinforcement to minimize cracking and to tie the structure together to ensure it is acting as assumed in the design.”

Why are main bars provided 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 do we provide reinforcement in two direction in a one way slab?

In two way slab, the ratio of longer span (l) to shorter span (b) is less than 2. So, the main reinforcement is provided in both directions for two way slabs. Example: These types of slabs are used in constructing floors of a multi-storeyed building.

How do you know if a slab is one way or two way?

If L/b the ratio is greater than or equal 2 or then it is considered a one-way slab. If L/b the ratio is less than 2 then it is considered a two-way slab. In one-way slab, the load is carried in one direction perpendicular to the supporting beam. In two-way slab, the load is carried in both directions.

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 is it critical that reinforcing steel is placed correctly?

Positioning. What’s important to remember is that the design of the structure is based on having the steel in the right place. Reinforcing steel must be secured to prevent displacement during construction activities and concrete placement. This is usually accomplished with tie wire.

Why are reinforcement provided at top of slab?

How is reinforcement provided in slabs? – Quora. Since slabs are mainly present to resist bending, the bars all laid although at the bottom and on the top you have to option of laying the bars only over the supporte where there is hogging (negative) moment.

Why corner reinforcement and temperature reinforcement is used in slab?

Corner reinforcement are also called as torsional reinforcement. Torsional reinforcement shall be provided at corner of two way slab. The torsional moment are high near the corner therefore, torsional reinforcement is essential to prevent corner slab from lifting and prevents cracks.