Situation $9$: A rectangular beam $300500mm$ is

subjected to an ultimate moment of $400kN-m.$

Design the beam and determine the following

required. Use effective concrete cover of $75$

$mm,f{c}^{\text{'}}=28$MPa and fy $=420$MPa.

What is the maximum steel reinforcement

for singly reinforced action?

a$.2632mm2$

c$.2728mm2$

b$.2854mm2$

d$.3005mm2$

What is the required number of $28mm$

tension bars?

a$.3$

c$.4$

b$.5$

d$.6$

What is the stress in compression

reinforcement?

a$.412$MPa

c$.420$MPa

b$.368$MPa

d$.353$MPa

What is the required number of $20mm$

compression bars?

a$.3$

c$.4$

b$.5$

d$.6$