$2.)$ 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 $\frac{10}{75}$ confine reinforcement is used,

sol

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: $\frac{C_{30}}{S_{420}}{d}^{\text{'}}=30mm$

sov