Q$4.$ A square RC section with the given reinforcement is subjected to defined loading.

Calculate the a$)$ the load $P$ that causes the cracking, neglecting the contribution from the

reinforcing steel, b$)$ the ultimate $P$ that could be carried by the system. Note that the design

material strengths should be used for calculations. $($C$35,$ S$420)$

$($a$)$ Answer $=P=44$ ton

$($b$)$ Answer $=P_{\text{u}\text{l}\text{t}}=91\mathrm{.}6$ ton

Please solve that question according to TS$500($Turkish Standards$).$