Question

Which of the following arch is considered to be most efficient in transferring load ?

• A. Semi circular
• B. Segmental
• C. Catenary
• D. Pointed

Hint:

A catenary curve is formed by a freely hanging chain. When inverted, it creates one of the most efficient structural arch forms because:
• Compression forces follow the arch profile
• Bending moments are minimized

Answer 1

The Correct Option is C

Concept: Arches transfer loads mainly through compression. The efficiency of an arch depends on how closely its shape follows the natural line of thrust under loading. Different arch forms include:
• Semi-circular arch
• Segmental arch
• Pointed arch
• Catenary arch Among these, the catenary arch is structurally the most efficient because it follows the natural curve formed by a hanging chain inverted under gravity.

Step 1: Analyze Semi-circular arch.
Semi-circular arches effectively transfer compressive forces but generate significant horizontal thrust. Hence, option A is not the most efficient.

Step 2: Analyze Segmental arch.
Segmental arches have a flatter profile and are efficient for shorter spans but are less structurally optimal compared to catenary arches. Hence, option B is incorrect.

Step 3: Analyze Catenary arch.
A catenary arch closely follows the ideal compression curve. \[ \text{Catenary shape} \Rightarrow \text{Pure compression with minimal bending} \] This allows the load to transfer efficiently through the arch. Hence, option C is correct.

Step 4: Analyze Pointed arch.
Pointed arches reduce horizontal thrust and are efficient in Gothic architecture, but they are still less ideal than catenary arches for pure load transfer. Hence, option D is incorrect.

Step 5: Choose the correct option.
The most efficient arch in transferring load is the catenary arch. Therefore, the correct answer is: \[ {\text{(C) Catenary}} \]