Q$4)$ Design member $($IJ$)($the internal force is $600kN$ compression$)$ in the given truss, assume the cross section of $($ IJ$)$ member is equal angle section with four lines if $15mm$ diameter bolts in standard holes side. Assume the holes are located at the member end & the connection length is $225mm.()=344,Fu=488,E=(200,000$

member JD is $500kN$ tension member I is $600kN$ compression