Consider two types of a column cross-section: a hollow square and a hollow circular section. In both cases the wall thickness is 8 mm and the area occupied by the load-bearing material is 1034 mm². Find which of these two column types produces a better buckling performance with relevant calculations supporting your answer. Answer • The outer size of the hollow square section can be calcaulated as . mm The outer diameter of the hollow circular section can be calcualted as mm The second moment of area for the hollow square section can be calculated as mm4 The second moment of area for the hollow circle section can be calculated as mm4 Find which of these two column types produces a better buckling performance. Hollow Circular Section Hollow Square Section

An A913 Gr. 60 W14x109 is used as a 15-m high column. The column is fixed at both ends and is laterally supported (hinged) at every one-third of its height about the weak axis.   Calculate the Euler Buckling stress, Fe in MPa. Select one: a. 635.25 b. 708.09 c. 832.92 d. 653.96

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Consider two types of a column cross-section: a hollow square and a hollow circular section. In both cases the wall thickness is 6 mm and the area occupied by the load-bearing material is 965 mm². Find which of these two column types produces a better buckling performance with relevant calculations supporting your answer. Answer The outer size of the hollow square section can be calculated as mm • The outer diameter of the hollow circular section can be calcualted as . mm The second moment of area for the hollow square section can be calculated as mm The second moment of area for the hollow circle section can be calculated as mm Find which of these two column types produces a better buckling performance. O Hollow Circular Section O Hollow Square Section