Question

Question 4 Please explain the term "overreinforced beam" and "underreinforced beam". Would you rather have an overreinforced beam or an underreinforced beam. Why?

Answer 1

Ovee-reinforced beam Section - ed Concrete beam sections in which the failure strain in concrete is geached earlier than the field strain of steel & Ca forebe It - T 7 Ca- nebe. . Concrete fails. - Ast: bolt 00000 talut tax Ast. Here, Ast - Area of steel Xa depth of Neutral Axia. Ca= strain in Concrete. ta= strain in Steel Nobc: Maximum Strain in Concrete (compressing). Ast: Maximum strain in steel. m = modular ratio. 7 Undey-Reinforced Beam Section Reinforced concrete beam sections in which the steel reaches yield strain at loads lower than the loads at which the concrete reaches failure Strain.

Cax nebe. & & Ca Caracbe. Steel fails I t talum neth =) ta Ast Underreinforced. For lotes - Yielding of steel in under reinforced beam Section does not mean that the structure has failed, as when steel yields, excessive de flection and cracking in beam will occur before failure which give enough time to Occupants to escape before the section fails Where as failures in over- seinforced section are all of a sudden without showing any sign of deflection and cracking. Therefore under-reinforced beam section is preferred over over-reinforced beam section.