$f_c^{\text{'}}=35$MPa

$($a$)$

$($b$)$

Compare the cracking moment based on the gross section properties and the transformed section properties with four No$.36$ bars in Fig. a based on a concrete tensile capacity of $0\mathrm{.}62\sqrt[\phantom{2}]{?}{f}_c^{\text{'}}.$

Compare the cracking moment based on the gross section properties and the transformed section properties with two No$.32$ bars in Fig. b based on a concrete tensile capacity of $0\mathrm{.}62\sqrt[\phantom{2}]{?}{f}_{c^{\text{'}}}.$

Determine the service level moment capacity of the section in Fig. a if the allowable stress for concrete is $0\mathrm{.}45f_c^{\text{'}}$ and the allowable stress for the reinforcement is $210$MPa. Use the areas of reinforcement from Problem $1.$

Determine the service level moment capacity of the section in Fig. b if the allowable stress for concrete is $0\mathrm{.}45f_c^{\text{'}}$ and the allowable stress for the reinforcement is $210$MPa. Use the areas of reinforcement from Problem $2.$