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Threaded Rods and Cables

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.

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Threaded Rods and Cables

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  1. 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).

  2. Threaded Rods and Cables • A strand consists of individual wires wound helically around a centrl core. • A wire rope is made of several strands laid helically around a core.

  3. Tension Members in Roof Truss • Trusses are used where the cost and weight of a beam could be prohibitive (long spans). • A truss may be thought of as a deep beam with much of the web removed. • Tension members in roof trusses include some truss members and sag rods.

  4. Sag Rods • Sag rods are used to provide lateral support for the purlins (to prevent sag in direction parallel to a sloping roof due to vertical applied loads). • They are designed to support the component of roof loads parallel to the roof.

  5. Sag Rods • Each segment between purlins is assumed to support everything below it; thus the top rod is designed for the load on the roof area tributary to the rod, from the heel of the truss to the peak.

  6. Sag Rods • The tie rod between ridge purlins must resist the load from all of the sag rods on either side.

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