Civil Engineering Reference
In-Depth Information
2
2
b
+
d
pier
c
=
hdr
distance to extrem
eeouter fiberofgluearea, in
2
2
′=
F
s
adjusted allowablerollingshear stress perPDS
,
psi
MC
j
F
=
=
shearforce,psi,onglueareaat
extremeouter fiberdue to rotation
rot
This force is perpendicular to line
c
.
The rotational shear at the extreme outer fiber must be broken down into horizontal
and vertical components. The vertical and/or horizontal shear applied directly to the
joint must also be combined with the shear caused by rotation, as shown by the upper
left figure.
F
=
(
HF
+
)
2
++ =
(
VF
)
2
resultantshear forceonglueelement
R
h
v
where
H
= horizontal force component of
F
rot
, psi
V
= vertical force component of
F
rot
, psi
F
h
= shear applied to extreme outer fiber from horizontal force applied to joint, psi
F
v
= shear applied to extreme outer fiber from vertical force applied to joint, psi
Vertical Shear Transfer (See Fig. 14.13)
The transfer of vertical shear at the joint can be accomplished as shown in the fig-
ure. Cripple studs should be installed above the header, and trimmer studs should
be installed below to resist the shears acting in both directions and to transfer them
into the pier section. If the nailing of the cripple studs above the header does not
have the capacity to resist shear acting in the upward direction, a tie strap can be
installed.
F
i g u r e
14.13 Transfer of vertical shear forces at joints.
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