One Way Slab And Two Way Slab Formula
Aspect ratio longer span shorter span if greater than equal to 2 it is one way slab and if less it is two way slab.
One way slab and two way slab formula. A slab or panel is said to be two way slab if the ratio of longer span to the shorter span is not greater than 2 two. In two way slab the main reinforcement bars are provided in both directions. For uniformly distributed loads of w per square foot of the slab each strip acts approximately like a simple beam uniformly loaded by its share of w. 2 two way slab spanning one way slab near about 100mm to 150mm based on the deflection.
Calculate aspect ratio and determine either it is one way or two way slab. In two way slab the ratio of l b is less than 2 i e l b 2. In one way slab the ratio of longer span to shorter span is equal or greater than 2. One way slabs are such slabs in which the loads are shared only by the shorter direction of the slab.
1 1 b shows two center strips of a rectangular plate with spans l a and l b. One way slab being supported on two opposite sides only leads to the structural action in single direction. I e l b 2. Load transfer in a one way slab b two way slab nilson fig.
If l b the ratio is less than 2 then it is considered a two way slab. One way slab economical near about 3 5 m. Beam and slab arrangement can be the best example for one way and two way slabs. Two way slab may economical for the panel sizes near about 6m x 6m.
Each single slabs are referred to as panels if the slab is continuous over supports. If l b the ratio is greater than or equal 2 or then it is considered a one way slab. Ly lx 2 one way slab spanning ly lx. In one way slab the main reinforcement is provided only in one direction shorter side.
Two way slabs is in the range of 100mm to 200mm depending upon. In one way slab the main reinforcement is provided in a short span and distribution reinforcement is provided in a long span. In above figure a represents one way slab. Here ratio of longer span of slab to the shorter span of slab is greater than 2.