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3 - Design of Tension Members To avoid yielding Ag Pu 0.9...

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Design of Tension Members To avoid yielding: A g P u / 0.9 F y To avoid fracture: A e P u / 0.75 F u Or : A n P u / 0.75 F u U where P u is the sum of the factored loads.
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Design of Tension Members If the axial load in a slender tension member is removed and small transverse loads are applied, undesirable vibrations or deflections may occur. Thus AISC recommends: r L/300 ( not for cables or rods) where r is the minimum radius of gyration of the cross section and L is the length of the member.
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Threaded Rods and Cables When slenderness is not a consideration, circular rods and cables are often used (hangers, suspended bridges). Rods are solid and cables are made from individual strands wound together. Threading the end of a rod reduces the cross sectional area ( upset end prevents such reduction, but is expensive).
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Threaded Rods and Cables 2200 φ t P n = 0.75 (0.75 A b F u ) A b = nominal (unthreaded) area It is common to use a min diameter of 5/8 in. for rods.
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Threaded Rods and Cables A strand consists of individual wires wound
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