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• Tension members are found in:– Bridge trusses,– Roof trusses,– Towers,– Bracing systems– As tie rods

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Types of Tension Members

• Circular Rods– One of the simplest of tension members– Difficult to connect to many structures

• Single Angles ( used in roof trusses)• Double angles• Tees (used in welded trusses)• Channels (Bridges and large roof trusses)• W sections (Bridges and large roof trusses)• Built up from plates and rolled shapes ( to have

sufficient cross-sectional area and rigidity)

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• Members consisting of more than one section need to be tied together.

• Tie plates or tie bars are used to tie them

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• Steel cables are tension members– in suspension bridges– as roof supports– Strength of about 200,00 to 250,000 psi

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• Gross section• AISC Specification (D2)• Nominal Strength of a tension member Pn

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• Net section• Bolt holes = D + 1/8• Nominal Strength of a tension member Pn

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Net Area Calculations

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Avoid eccentricities

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Quantity added for inclined lines

• Empirical equation, AISCS (B4.3b)• S is the pitch (distance c-t-c parallel to

Tension)• g is the gage (distanc c-t-c perpendicular to

Tension)

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