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

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


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)



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

• Tie plates or tie bars are used to tie them


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


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


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


Net Area Calculations


Avoid eccentricities



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)








Documents

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