Waffle Slab

Definition

A Waffle Slab is a two-way concrete joist system made up of a double system of narrow ribs or joists, usually at right angles to each other, forming a pattern of waffle-like coffers.

Purpose

The purpose of a waffle slab is to provide a lightweight, yet strong, floor or roof system that can span large areas without the need for numerous support columns. It is used in buildings requiring long, open spans.

Examples of Use

• Commercial Buildings: Waffle slabs are used in offices and shopping malls to create large, open floor plans.
• Parking Garages: The design of waffle slabs supports heavy loads and allows for expansive, column-free spaces.
• Institutional Buildings: Universities and hospitals use waffle slabs for their structural efficiency and aesthetic appeal.

Related Terms

• Two-Way Slab: A type of slab that distributes loads in two directions.
• Flat Slab: A slab without beams, supported directly by columns.
• Coffered Ceiling: A ceiling with a grid of recessed panels, similar in appearance to a waffle slab's underside.

Notes

Waffle slabs require precise formwork and reinforcement placement to ensure structural integrity. They are known for their strength, reduced weight, and ability to support heavy loads.

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