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Q: According to the recommendations of IS: 456 - 1978, the expansion joints
  • A. are provided where plane changes abruptly
  • B. are provided to ensure minimum resistance
  • C. are supported on separate columns
  • D. all option are correct
Correct Answer: Option D - As per IS 456 : 2000 Clause 27.1 - • Expansion joint shall be so provided that the necessary movement occurs with a minimum resistance at the joint. • Structure exceeding 45 m in length are designed with one or more expansion joint. • Expansion joints are provided where plane changed abruptly. • Reinforcement shall not extend across the joint.
D. As per IS 456 : 2000 Clause 27.1 - • Expansion joint shall be so provided that the necessary movement occurs with a minimum resistance at the joint. • Structure exceeding 45 m in length are designed with one or more expansion joint. • Expansion joints are provided where plane changed abruptly. • Reinforcement shall not extend across the joint.

Explanations:

As per IS 456 : 2000 Clause 27.1 - • Expansion joint shall be so provided that the necessary movement occurs with a minimum resistance at the joint. • Structure exceeding 45 m in length are designed with one or more expansion joint. • Expansion joints are provided where plane changed abruptly. • Reinforcement shall not extend across the joint.