Example 377

Compression resistance of a composite column

Figure 37.17 shows the dimensions of a concrete filled circular steel section. The effective length of the column is 4 m. Calculate the column compression resistance for a standard fire resistance period of 60min. At ambient temperature, steel has a design strength of 275N/mm2 and Young's modulus of 205,000 N/mm2. Concrete has a design compression strength of 40 N/mm2 and modulus of elasticity of 20,000 N/mm2.

Circular hollow section Outside diameter 300 mm Wall thickness 20 mm

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