For the column section given in the figure,

a$)$ If no confined reinforcement is used,

b$)$ If $10/150$ confine reinforcement is used,

c$)$ If $10/75$ confine reinforcement is used,

Based on the Mander model for the given section, obtain the concrete stress$-$strain relationship for each case given above and show it on a graph. Briefly comment on the results you have found. $($You can use TSC$2018-5$A for the formulas.$)$

Material: C$30/$S$420$ d$=30$ mm$2.)$ For the column section given in the figure,

a$)$ If no confined reinforcement is used,

b$)$ If $\frac{O}{{?}_{10}}\frac{?}{150}$ confine reinforcement is used,

c$)$ If $\frac{O}{{?}_{\frac{10}{75}}}$ confine reinforcement is used,

Based on the Mander model for the given section, obtain the concrete

stress$-$strain relationship for each case given above and show it on a graph.

Briefly comment on the results you have found. $($You can use TSC$2018-5$A for

the formulas.$)$

Material: C$30,S420,d^{\text{'}}=30mm$