Do(mm) = 200 to(mm) = ? L(mm) = 3000 fsteel, max(MPa) = 135 fconcrete, max(MPa) = 22

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Do(mm) = 200
to(mm) = ?
L(mm) = 3000
fsteel, max(MPa) = 135
fconcrete, max(MPa) = 22

Do Mm 200 To Mm L Mm 3000 Fsteel Max Mpa 135 Fconcrete Max Mpa 22 1 (154.63 KiB) Viewed 42 times

Do Mm 200 To Mm L Mm 3000 Fsteel Max Mpa 135 Fconcrete Max Mpa 22 2 (76.83 KiB) Viewed 42 times

1) A Concrete Filled Tube (CFT) consists of a steel hollow section filled with concrete, in which the two materials act compositely. The column is loaded in axial compression. The material properties are Econcrete = 30 GPa, Esteel = 200 GPa, and both materials experience linearly elastic behaviour. D. is the external diameter. D. ! to () L Typical column cross-section 1
. Calculate the value of to so that the ratio of the axial force in the concrete, to the axial force in the steel, is 2. . . Round this value of to upwards to the next highest integer. Call this thew. Eg if you calculated to = 1.22 mm, round up to 2 mm But if to was exactly an integer, do not round up Now consider the composite column with outer tube thickness tnew (1) The column must satisfy the stress limits in the table for steel and concrete (2) The strain in both materials s 500 ue (3) The axial shortening s 1.65 mm What maximu axial load P to satisfy all the design criteria? What are the values of steel and concrete stress and strain, and axial shortening, for the critical value of P? . .