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Question
Expansion joints are provided if the length of concrete structure exceeds
A.
10 m
B.
15 m
C.
35 m
D.
45 m
Answer ( Option D)

45 m

Solution

• According to IS 456: 1978, the expansion joints are provided in the structures in which marked changes in plane dimension take place abruptly.
• They are required when the length of structure exceeds 45m
• Expansion joints shall be so provided that the necessary movements within the minimum resistance at the joints. The structures adjacent to the joints should preferably be supported on separate columns or walls but not necessarily on separate foundations.

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