Question

Which of the following is not a type of support in structural analysis?

• A. Fixed support
• B. Roller support
• C. Pinned support
• D. Elastic support

Hint:

Idealized Structural Supports. Roller (1 reaction force), Pinned/Hinge (2 reaction forces), Fixed (2 reaction forces, 1 reaction moment). These represent constraints on translation and rotation.

Answer 1

The Correct Option is D

In structural analysis, supports are idealized models representing how a structure is connected to its surroundings and constrained against movement.
Common idealized support types include: - Roller Support: Prevents translation perpendicular to the support surface but allows translation parallel to it and rotation.
(Provides 1 reaction force).
- Pinned Support (or Hinge): Prevents translation in both horizontal and vertical directions but allows rotation.
(Provides 2 reaction forces).
- Fixed Support (or Built-in/Clamped): Prevents translation in both directions and also prevents rotation.
(Provides 2 reaction forces and 1 reaction moment).
While real supports have some degree of flexibility (elasticity), "Elastic support" is not typically classified as one of the fundamental *idealized* support types alongside fixed, pinned, and roller in basic structural analysis.
Elastic foundations or springs can be used to model support flexibility, but 'elastic support' isn't a standard category like the others.