Design of Slabs MCQ with answer and solution

Concept

Waffle slab selection for large spans

Formula

NONE

Step-by-step solution

1. Slabs spanning primarily in one direction transfer loads directly to supporting parallel beams or walls. 2. For long spans along a single axis, one-way slabs supported on deep beams provide structural efficiency. Answer: D

Explanation

Waffle slabs feature a grid of deep ribs that provide high stiffness while significantly reducing overall self-weight. This structural configuration enables them to efficiently span large, column-free distances. Consequently, option D is the correct choice.

Why the other options are wrong

B) Two-way slabs are limited to smaller panel aspect ratios and require peripheral beam supports. C) Flat slabs are subject to punching shear and excessive deflections over very large column-free spans.

Shortcut

Large column-free spans = Waffle slab.

Common mistake

Selecting flat slab instead of waffle slab as the most efficient option for large column-free spaces.