Joints - The Behaviour and Design of Steel Structures to EC3 - page 398

End plate connected
with fillet welds

Web stiffener Butt welds

Bolts

Bolts

(a) Shear connection
to web

(b) Shear connection
to flange

(c) Moment joint

Figure 9.6 Joints between beams.

e

Q Q

+

M = Qe

Figure 9.7 Analysis of a force and moment joint.

semi-rigid beam-to-column connection of Figure 9.3b, the full-strength beam
spliceofFigure9.5c,andthebeamjointofFigure9.6c.Commonbeam-to-column
joints are given in [2-11], and are discussed in Section 9.5.
In some instances, joints may actually transfer forces or moments which are
not intended by the designer. For example, the cleats shown in Figure 9.3a may
transfer some horizontal forces to the column, even though the beam is designed
as if simply supported, while a similar situation occurs in the shear splice shown
in Figure 9.5a.

9.4 Behaviour of joints

9.4.1 Joints for force transmission

Whenshearandbearingboltsinclearanceholesareusedinanin-planeforcejoint,
there is an initial slip when the shear is first applied to the joint as some of the
clearances are taken up (Figure 9.8). The joint then becomes increasingly stiff as