What is the defining characteristic of a two-way slab?

• A. It has a long end to short end ratio greater than or equal to 2
• B. It has a long end to short end ratio less than 2
• C. It is constructed from reinforced concrete only
• D. It supports loads along one direction only

Answer: (B)

A two-way slab is characterized by its ability to distribute loads in both directions—lengthwise and widthwise. This feature is typically determined by the aspect ratio, or the end-to-short end ratio of the slab. When this ratio is less than 2, the slab can effectively act as a two-way system, allowing it to support loads from multiple directions.

In contrast, when the long end to short end ratio is greater than or equal to 2, the slab behaves more like a one-way slab, where loads are primarily supported in one direction. Therefore, the defining characteristic of a two-way slab is that it has a long end to short end ratio of less than 2, allowing for improved load distribution and support across the entire slab.