Civil Engineering Reference
In-Depth Information
P
y
e
x
d
y
T
r
T
x
T
b
FIGURE 9.20
Eccentric shear forces on a bolted connection.
the centroid to the bolt in the
x
-direction, and
y
T
is the distance from the centroid to
the bolt in the
y
-direction.
The resultant shear stress on any bolt described by locations
x
and
y
is
(
T
x
.
τ + τ
T
y
)
2
f
=
+ τ
(9.59)
9.3.4.3.3 Beam Framing Connections
Bolted beam framing connections are often used in the main members of steel railway
P
, and member end bending moments,
M
e
. Furthermore, the legs of the connection
angles fastened to the web of the beam (a double-shear connection) may also be
subject to a torsional moment,
Pe
, due to the eccentric application of shear force
†
(Figure 9.21a, side elevation).
Beam framing connections are often assumed to transfer shear only (i.e., it is
assumed the beam is simply supported and
M
e
=
0), provided that adequate connec-
tion flexibility exists. However, due to some degree of end restraint, a corresponding
proportion of fixed end moment,
M
e
/M
f
where
M
f
is the
fixed end beam moment). The magnitude of the end moment depends on the rigidity
of the support and can be of considerable magnitude (Al-Emrani, 2005).
δ
M
e
, typically exists (
δ =
∗
These connections can be single-shear or double-shear connections depending on configuration. For
example, in the floor systems of many steel railway superstructures, a double-shear connection exists at
interior floorbeams and, typically, a single-shear connection at end floorbeams.
†
Depending on whether these effects are accounted for in the structural analysis.
