Problem $3-$ Material properties at elevated temperature

Plot the following parameters, as per ASCE $1992$ constitutive relations, for normal density

$($carbonate aggregate$)$ concrete as a function of temperature:

$($a$)$ Stress$-$strain relationships at $20C,200C,400C,500C,600C$ and $800C($plot on a single

graph$).$

$($b$)$ Thermal capacity as a function of temperature up to $800C.$ Discuss the trend of the results.