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This article clearly describes One Way Slab Vs. Two Way Slab, in other words, carries detailed information about the Difference Between One Way Slab and Two Way Slab.

Steel-reinforcement slabs, with thicknesses ranging from 100 to 500 mm, are commonly used for constructing floors and ceilings.

**1. One-Way Slab **

**The one-way slab can be defined as the type of slab in which the ratio of the longer to the shorter span is more than two.**

Mathematically;

**(Longer Span / Shorter Span) ≥ 2**

The shorter span of the one-way slab is provided with the primary reinforcement, while the longer span is provided with the distribution reinforcement.

Some prominent examples of one-way slabs are the cantilever slabs, chajjas, and verandahs.

**2. Two Way Slab **

**In a two-way slab, the longer to the shorter span ratio is less than two. i.e.**

**( Longer Span/Shorter Span) <2**

The load is carried in both directions in a two-way slab. So, the main bars are provided in both directions.

Two-way slabs are extensively used in multi-story and **commercial buildings**.

There are three common types of two-way slabs. They are:

Type of Two-Way Slab | Applications | Span Capability | Rib/Waffle System | Weight | Modular Suitability |
---|---|---|---|---|---|

Two Way Solid Slab (with beams) | Versatile, Large-scale | Wide Range | None | Heavier | Less Suitable |

Two-Way Waffle Slab (with beams) | Offices, Warehouses, Parking | Moderate Spans | Waffle System | Lighter | Suitable (Low-rise) |

Two-Way Waffle Slab (with Integral Beams) | Modular Constructions | Larger Spans | Waffle System | Moderate | Suitable |

**3. One Way Slab Vs. Two Way Slab **

The difference between a One-way slab and a Two-way slab is as follows:

Characteristic | One-Way Slab | Two-Way Slab |

Definition | The ratio of longer to shorter spans is more than two. | The ratio of longer to shorter spans is less than two. |

Bending moment | Occurs in one direction only. | Occurs in two perpendicular directions. |

L/B ratio | Greater than 2. | Less than 2. |

Crank | Reinforcement cranked in one direction (perpendicular to supporting beams) | Reinforcement cranked in two directions (both longer and shorter spans) |

Primary reinforcement | Provided primarily in one direction (perpendicular to supporting beams) | Provided in both directions. |

Support | They are supported by a beam on two opposite sides only. | Beams on all four sides support them. |

Load carrying | The load is carried in one direction perpendicular to the supporting beam. | The load is carried in both directions. |

Economy | Economical up to a span of 3.6 meters. | Economical for panel sizes up to 6m x 6m. |

Quantity of steel | Less. | More. |

Applications | Culverts, bridges, etc. | Residential buildings, water tanks, etc. |

Read Also: Two-Way Slab |

Verified Article By Er. Madhu Krishna Poudel |