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Q: According to the steel beam theory of doubly reinforced beams
  • A. tension is resisted by tension steel
  • B. compression is resisted by compression steel
  • C. stress in tension steel equals the stress in compression steel
  • D. All option are correct
Correct Answer: Option D - As per this theory i.e. steel beam theory, the concrete is completely neglected and it comes under working stress method. We know that concrete is weak in tension but steel beam theory assumes that concrete is weak in compression also. We get same amount of steel in both tension & compression. Hence all the moment is resisted by steel only.
D. As per this theory i.e. steel beam theory, the concrete is completely neglected and it comes under working stress method. We know that concrete is weak in tension but steel beam theory assumes that concrete is weak in compression also. We get same amount of steel in both tension & compression. Hence all the moment is resisted by steel only.

Explanations:

As per this theory i.e. steel beam theory, the concrete is completely neglected and it comes under working stress method. We know that concrete is weak in tension but steel beam theory assumes that concrete is weak in compression also. We get same amount of steel in both tension & compression. Hence all the moment is resisted by steel only.