Tension Members and Connections in Steel Design: A Comprehensive Guide, Slides of Structures and Materials

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PREPARED BY:

ENGR. B.G GARWAGEO, MSCE

Assistant Professor

TENSION MEMBERS

• REVITS/BOLTS CONNECTIONS

• STAGGERED CONNECTIONS

• BLOCK SHEAR FAILURE

• WELDED CONNECTION

SteelD STEEL DESIGN

LECTURE 102

GENERAL PROVISIONS NSCP 2015 Staggered Connection

What is Steel?What is Steel?

What is Steel?What is Steel?

Of the several factors influencing the performance of a tension member, the manner in which it is connected is the most important. A connection almost always weakens the member, and the measure of its influence is called the joint efficiency. This factor is a function of the ductility of the material, fastener spacing, stress concentrations at holes, fabrication procedure, and a phenomenon known as shear lag. All contribute to reducing the effectiveness of the member, but shear lag is the most important. Shear lag occurs when some elements of the cross section are not connected, as when only one leg of an angle is bolted to a gusset plate, as shown in Figure 3.6. The consequence of this partial connection is that the connected element becomes overloaded and the unconnected part is not fully stressed. Lengthening the connected region will reduce this effect. Research reported by Munse and Chesson (1963) suggests that shear lag be accounted for by using a reduced, or effective, net area. Because shear lag affects both bolted and welded connections, the effective net area concept applies to both types of connections.