A rectangular beam of width 230 mm and an effective depth of 300 mm is proposed to carry a service BM and SF of 120 kN m and 270 kN. If M25 and Fe 415 steel are used. Which one of the following statements is true?
|
Concrete grade |
M 15 |
M 20 |
M 25 |
M 30 |
M 35 |
M 40 and above |
|
τc max(N/mm2) |
2.5 |
2.8 |
3.1 |
3.5 |
3.7 |
4.0 |
1
It is safe in shear
2
It can be designed as singly reinforced
3
It is unsafe in shear and can be designed as singly reinforced
4
It is unsafe in shear and can be designed as doubly reinforced beam