Structural Steel Design, Fifth Edition, McCormac and Csernak , 2012 (International
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Transcript of Structural Steel Design, Fifth Edition, McCormac and Csernak , 2012 (International
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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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• Steel cables are tension members– in suspension bridges– as roof supports– Strength of about 200,00 to 250,000 psi
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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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• Pn Nominal Strength
• Ag Gross area• An Net area
• Ae effective net area
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• Bolt holes = D + 1/8• An = Ag – n ( D + 1/8) t +
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• 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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Net Area Calculations
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Effective Net Area Ae
• U is a factor to account for non uniform stress distribution• Value of U is affected by:
– cross section of the member– Length of connection
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3-35 Determine the allowable strength of the section WT6x26.5, A992 steel, attached through the flange with six – 1 inch diameter bolts as shown in Fig. P3-35
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