A rectangular shallow bin $3m$ by $2\mathrm{.}5m$ in plan is required to store $240kN$ of foamed slag aggregates. The unit weight of the aggregates being $9\mathrm{.}5k\frac{N}{m^3}.$ The bin is supported on four R$.$C columns at the corners.Using $M-15$ grade concrete and Grade$-1$ mild steel,design the side walls,hopper bottom and the column and sketch the struc$-$ tural detais.Angle of repose $=30$ degrees,Angle of surcharge $=25$ degree. $.$