Unformatted text preview: axes is the same. 16.62 A compression chord of a small truss consists of two L127 × 76 × 12.7 steel angles arranged with long legs back-to-back as shown. The angles are separated at intervals by spacer blocks. (a) Determine the spacer thickness required so that the moments of inertia for the section about the two principal axes are equal. (b) For a compression chord with an effective length of KL = 7 m, determine the allowable axial load P allow that may be supported by the column using the spacer thickness determined in part (a). Use the AISC equations and assume E = 200 GPa and σ Y = 340 MPa. 16.68 A 6061-T6 aluminum-alloy rectangular tube shape has the dimensions shown. The rectangular tube is used as a compression member that is 2.5-m long. Both ends of the compression member are fixed. Determine the allowable axial load P allow that may be supported by the rectangular tube. Use the Aluminum Association column design formulas. For practice 16.18 16.39 16.75...
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- Winter '09
- Column, Buckling, Compression member, critical buckling load, allowable axial load