Two L102 76 9.5 structural steel angles (see Appendix B for its cross-sectional properties) are used as a compression member that is 4.5 m long. The angles are separated at intervals by spacer...

Two L102

76

9.5 structural steel angles (see Appendix B for its cross-sectional properties) are used as a compression member that is 4.5 m long. The angles are separated at intervals by spacer blocks and connected by bolts, as shown in Figure P16.9, a configuration which ensures that the double-angle shape acts as a unified structural member. Assume that pinned connections are at each end of the column, and use E = 200 GPa for the steel. Determine the Euler buckling load for the double-angle column if the spacer block thickness is

(a) 5 mm.

(b) 20 mm.