A hollow, round column has length (L = 1500 mm), outsidediameter (do = 20 mm) and inside diameter (di = 14 mm). If thecolumn is made of steel (E = 207 GPa, Sy = 300 MPa), then determineif it is a Johnson or an Euler column and find the critical loadPcr for each of the following end-conditions:
(a) Pinned-pinned
(b) Fixed-pinned
(c) Fixed-fixed
(d) Fixed-free
