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Cable Structure

Cable Structure. Cables are often used in engineering structures for support and to transmit loads from one member to another. When used to support suspension bridges, cables form the main load-carrying element in the structure. Note: Cable can only carrying tensile force.

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Cable Structure

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  1. Cable Structure Cables are often used in engineering structures for support and to transmit loads from one member to another. When used to support suspension bridges, cables form the main load-carrying element in the structure. Note: Cable can only carrying tensile force.

  2. Parabolic equation of Cable

  3. Cable supported at same level Consider free body diagram at left hand side of C:

  4. Maximum tensile force in the cable,

  5. Cable supported at different level Consider cable ACB’:

  6. Consider cable A’CB:

  7. But H1 = H2 = H, then Lowest position equation Vertical Reactions RA and RB Tensile force in the cable at A and B

  8. CABLE SUPPORT Two types – Sokong Takal Pandu, Roller Support Sokong Takal Pandu Driven pulley support Smooth Pulley: Tp = Tg =T Reactions from tower (menara): Menara

  9. Roller Support Note: To ensure the roller not moves laterally: Equilibrium Vertically:

  10. Example 7.1 • Figure below shows a cable structure supported by frictionless roller which is located on top of tower. Determine: • Maximum and minimum tensile force exerted by the cable • Vertical reaction force exerted by tower at A and B

  11. Solution Find l1 and l2 Solving equations (a) and (b) give l1 = 18.376 m and l2 = 11.623 m Find H or

  12. Take H = 146.35 kN Find RA and RB in the cable Find tensile force exerted by the cable (at A and B) Maximum tensile force occurred at B, minimum tensile force occurred at C (lowest point in the cable) (=H=146.35 kN)

  13. (b) Reaction forces exerted by the tower

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