5_tension structures_09

5_tension structures_09 - – bridge deck(roadway –...

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Notes 1160: Tension Structures 1 Tension Structures “Tensile” Forces forces that pull and cause a structure to stretch Tension Structures simplest type of tension structure “unidirectional” – stress, σ T
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Notes 1160: Tension Structures 2 Examples Ropes and cables Muscles and tendons Spider webs Rods Strings on a cello, guitar, violin, piano freq t α σ
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Notes 1160: Tension Structures 3 Cables Unidirectional tension Axial force structures Form-active shape of cable structure depends on the loads examples
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Notes 1160: Tension Structures 4 Form-Active Cable Examples Concentrated load P Uniform load
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Notes 1160: Tension Structures 5 For any set of loads, a cable structure will have a unique form This form ensures that there are only tension forces in the cables!
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Notes 1160: Tension Structures 6 The Suspension Bridge Components longitudinal (main) cables vertical hangers (suspenders)
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Unformatted text preview: – bridge deck (roadway) – towers – anchorages Notes 1160: Tension Structures 7 Hangers and Bridge Deck • hangers are in tension – carry the bridge deck • bridge deck – carries traffic, snow, etc. Notes 1160: Tension Structures 8 Main Cable • Free-body diagram of main cable • Cable is in tension – supported by towers – attached to anchors on each bank – supports hangers Notes 1160: Tension Structures 9 • Therefore, the main cables carry: – their own weight – the weight of the • hangers • bridge deck • traffic, snow, etc. Notes 1160: Tension Structures 10 Towers and Anchors • The towers and anchors support the main cables • Towers are in compression • Anchors are being pulled in tension • And, eventually, all the load is transferred to the ground....
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