CrazyEngineers Archive

Old, but evergreen and popular discussions on CrazyEngineers, presented to you in read-only mode.

@madugula • 08 Feb, 2010

what is the difference between one way and two way slab in terms of their structural behaviour?

@CIVILPRINCESS • 08 Feb, 2010 • 1 like

One way slabs are designed to transfer their loads to only two opposite support walls. Generally for spans up to 3.60 meters and with length/breadth ratio is greater than 0.60 one way slabs can be provided.the reinforcement will be along the longer direction.

Two way slabs are designed to transfer their loads to all the four support walls. Generally for spans greater than 3.60 meters and with length/breadth ratio is less than 0.60 two way slabs can be provided.the reinforcements will be placed along the length and the breadth i.e. the reinforcements will be perpendicular to one another.

A one way slab, have it structural strength in shortest direction.

A two way slab, have it structural strength in in two direction.

**Re: slabs**One way slabs are designed to transfer their loads to only two opposite support walls. Generally for spans up to 3.60 meters and with length/breadth ratio is greater than 0.60 one way slabs can be provided.the reinforcement will be along the longer direction.

Two way slabs are designed to transfer their loads to all the four support walls. Generally for spans greater than 3.60 meters and with length/breadth ratio is less than 0.60 two way slabs can be provided.the reinforcements will be placed along the length and the breadth i.e. the reinforcements will be perpendicular to one another.

A one way slab, have it structural strength in shortest direction.

A two way slab, have it structural strength in in two direction.

@Guttu • 10 Feb, 2010 • 1 like

One way slabs bend in one direction and load is distributed in one direction only. They behave like a beam. slabs with length/breadth ratio above 2 are considered as one way slabs.

Two way slabs are those where length/breadth ratio is below 2. The load is distributed in all four sides. Deflection and bending is reduced to a great extent compared to one way slab.

In both case main reinforcement is provided along long span.

**Re: slabs**One way slabs bend in one direction and load is distributed in one direction only. They behave like a beam. slabs with length/breadth ratio above 2 are considered as one way slabs.

Two way slabs are those where length/breadth ratio is below 2. The load is distributed in all four sides. Deflection and bending is reduced to a great extent compared to one way slab.

In both case main reinforcement is provided along long span.

@jagadeshkannan • 26 Feb, 2010

Your explanation about one way & two way slabs was good, but you have mentioned "In both case main reinforcement is provided along long span" thats wrong. for one way slab the main reinforcement should be along the shorter span.

**Re: slabs**Hi Mr.GuttuGuttuOne way slabs bend in one direction and load is distributed in one direction only. They behave like a beam. slabs with length/breadth ratio above 2 are considered as one way slabs.

Two way slabs are those where length/breadth ratio is below 2. The load is distributed in all four sides. Deflection and bending is reduced to a great extent compared to one way slab.

In both case main reinforcement is provided along long span.

Your explanation about one way & two way slabs was good, but you have mentioned "In both case main reinforcement is provided along long span" thats wrong. for one way slab the main reinforcement should be along the shorter span.

@undo • 26 Mar, 2010

for one way slab. the bending of slab is along the short span. technically.. we avoid doing bottom rebar splice at mid span.

but figuratively with a ruler, the bending is along the longest span. im quite confuse as my lecturer love to make bending examples with a ruler.

**Re: Difference between one way and two way slab in terms of their structural behaviou**for one way slab. the bending of slab is along the short span. technically.. we avoid doing bottom rebar splice at mid span.

but figuratively with a ruler, the bending is along the longest span. im quite confuse as my lecturer love to make bending examples with a ruler.

@De Divine • 11 Jul, 2014
For one way slab, the bending of slab is along the shorter span. Then where does two way bending takes place

@Jitendra Tiwari • 02 Jan, 2020 • 1 like

One way slab is supported on two opposite sides by rigid supports and carry the load in the direction perpendicular to the supports. the plane surface of the uniformly loaded slab deforms into a cylindrical surface and bending moment develops only in one direction.

Whereas two-way slab supported on four edges with the ratio longer span to shorter span less than 2. Two-way slab carries the load in two perpendicular directions.

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