A plane truss composed of two steel pipes (E 5 210 GPa, d 5 100 mm, and wall thickness 5 6.5 mm) is subjected to vertical load W at joint B. Joints A and C are L 5 7 m apart. The critical value of load W for buckling in the plane of the truss is nearly:
(A) 138 kN
(B) 146 kN
(C) 153 kN
(D) 164 kN
(A) 138 kN
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