Question

Maximum distance between expansion joints in structures as per IS: 456–2000 is:

• A. \( 20 \, \text{m} \)
• B. \( 30 \, \text{m} \)
• C. \( 45 \, \text{m} \)
• D. \( 60 \, \text{m} \)

Hint:

% Quick Tip As per IS 456:2000, expansion joints should be provided when the length of RCC structures exceeds 45 meters to accommodate thermal movement and prevent cracking.

Answer 1

The Correct Option is C

Step 1: What are Expansion Joints?
Expansion joints are structural separations designed to allow for movement caused by temperature changes, shrinkage, creep, or seismic activity. Without them, differential movement can cause cracks and structural failure.
Step 2: Reference from IS 456:2000.
According to Clause 26.2.1 of IS 456:2000:
“Expansion joints shall be provided in buildings to avoid cracking due to thermal movement. Normally, expansion joints are provided where the length of the building exceeds 45 m.”
Step 3: Interpretation.
This clause clearly states that if the length of a structure exceeds 45 meters, expansion joints must be provided. Therefore, the maximum allowable spacing between two expansion joints is: \[ \boxed{45 \, \text{m}} \]