Structural Steel Design, Fifth Edition, McCormac and Csernak , 2012 (International

1. Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 1

2. Tension members are found in: • Bridge trusses, • Roof trusses, • Towers, • Bracing systems • As tie rods Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 2

3. Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 3

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) Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 4

5. Steel cables are tension members • in suspension bridges • as roof supports • Strength of about 200,00 to 250,000 psi Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 5

6. Members consisting of more than one section need to be tied together. • Tie plates or tie bars are used to tie them Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 6

7. PnNominal Strength • Ag Gross area • An Net area • Ae effective net area Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 7

8. Bolt holes = D + 1/8 • An = Ag – n ( D + 1/8) t + • 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) Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 8

9. Net Area Calculations Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 9

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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 Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 24

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34. 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 Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 34

35. جداول خصائص الفولاذ ومقاطع الفولاذ الانشائية • مقرر منشآت معدنية • مقرر منشآت 5 • تجدها في المكتبة