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2. Tension members are found in:
Bridge trusses,
Roof trusses,
Towers,
Bracing systems
As tie rods
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4. 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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5. Steel cables are tension members
in suspension bridges
as roof supports
Strength of about 200,00 to 250,000 psi
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6. 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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7. Pn Nominal Strength Ag Gross area An Net area Ae effective net area 7
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8. Empirical equation, AISCS (B4.3b) 𝑠 2 4𝑔
Bolt holes = D + 1/8
An = Ag – n ( D + 1/8) t + 1 𝑛−1 𝑠 2 4𝑔 𝑡
Empirical equation, AISCS (B4.3b)
𝑠 2 4𝑔
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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9. Net Area Calculations
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24. 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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34. 3-35 Determine the allowable strength of the section WT6x26
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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35. جداول خصائص الفولاذ ومقاطع الفولاذ الانشائية
مقرر منشآت معدنية
مقرر منشآت 5
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