Figure 1 shows the cross-section of a rectangular hollow section steel column under axial compression. The steel tube is fabricated by heavily welding four steel plates with unequal thickness as depicted in Figure 1. The yield stress of the steel section is $300 MPa$ . (a) Check the slenderness of the flanges and webs. ( 5 marks) (b) Determine the effective and gross areas of the cross-section. (5 marks) (c) Determine the design axial capacity of the cross-section. ( 5 marks) Figure 1. Cross-section of the rectangular hollow section steel column (Units: mm)

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Figure 1 shows the cross-section of a rectangular hollow section steel column under axial compression. The steel tube is fabricated by heavily welding four steel plates with unequal thickness as depicted in Figure 1. The yield stress of the steel section is

300 MPa

. (a) Check the slenderness of the flanges and webs. ( 5 marks) (b) Determine the effective and gross areas of the cross-section. (5 marks) (c) Determine the design axial capacity of the cross-section. ( 5 marks) Figure 1. Cross-section of the rectangular hollow section steel column (Units: mm)

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