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Q: In limit state approach of design of RCC structures, the spacing of main reinforcement bars primarily controls :
  • A. Collapse
  • B. Cracking
  • C. Deflection
  • D. Durability
Correct Answer: Option B - Cracking– In limit state approach spacing of the main, reinforcement primarily controls, cracking width with in the permissible limit under normal exposure condition. The code specifies minimum and maximum limit for the spacing between parallel reinforcing bars in a layer. The minimum limits are necessary to ensure that the concrete can be placed easily in between and around the bars during the placement of fresh concrete. The maximum limits are specified for bar in tension for the purpose of controlling crack-widths and improving bond.
B. Cracking– In limit state approach spacing of the main, reinforcement primarily controls, cracking width with in the permissible limit under normal exposure condition. The code specifies minimum and maximum limit for the spacing between parallel reinforcing bars in a layer. The minimum limits are necessary to ensure that the concrete can be placed easily in between and around the bars during the placement of fresh concrete. The maximum limits are specified for bar in tension for the purpose of controlling crack-widths and improving bond.

Explanations:

Cracking– In limit state approach spacing of the main, reinforcement primarily controls, cracking width with in the permissible limit under normal exposure condition. The code specifies minimum and maximum limit for the spacing between parallel reinforcing bars in a layer. The minimum limits are necessary to ensure that the concrete can be placed easily in between and around the bars during the placement of fresh concrete. The maximum limits are specified for bar in tension for the purpose of controlling crack-widths and improving bond.