Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 1
• 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
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 3
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
• 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
• 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
• Pn Nominal Strength
• Ag Gross area• An Net area
• Ae effective net area
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 7
• Bolt holes = D + 1/8• An = Ag – n ( D + 1/8) t +
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 8
• 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)
Net Area Calculations
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 9
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 10
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 11
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 12
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 13
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 14
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 15
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 16
17
18
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 19
20
21
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 22
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 23
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
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 25
26
27
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 28
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 29
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 33
Structural Steel Design, Fifth Edition, McCormac and Csernak, 2012 (International 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
الفوالذ ومقاطع الفوالذ خصائص جداولاالنشائ�ية
معدنية • منشآت مقررمنشآت • 5مقرر
المكتبة • في تجدها
Top Related