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# RE: Cold-Formed Joist Lap Splice Question...One more time

• To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
• Subject: RE: Cold-Formed Joist Lap Splice Question...One more time
• From: "Jeffery Seegert (x 485)" <jbseegert(--nospam--at)matrixti.com>
• Date: Tue, 17 Aug 1999 15:57:19 -0400

```This would not be the same condition because the hinge is not developed.
In order to design the connection with a hinge the left beam would have
to stop at the left hinge point and the right beam would have to stop at
the right hinge point.  Instead the left beam cantilevers to the right
hinge and the right beam cantilevers to the left hinge.  The reaction
input into the continuous beam by the connection bolt from the
cantilever will impart a moment on the continuous beam.  the same is
true on the other side.  The area of the beam is doubled over the
support so each section resists half of the negative moment.

___________________P1               P2____________________
^            b1             ^                                    ^
b2               ^

_____________P2_____P1____________
^             b1                ^             b2            ^

b1 resists the point load from P2 in bending and b2 resists the point
P1 and P2 equals the negative moment over the middle common support
divided by the distance from the support to the connection.  This is a
shear connection designed to resist the  force that creates a moment and
thus a continuous beam.  It is not a moment connection but it is
designed to transfer the moment through the splice.

.
-----Original Message-----
From: William Keil [mailto:WJK(--nospam--at)brph.com]
Sent: Tuesday, August 17, 1999 3:37 PM
To: 'seaint(--nospam--at)seaint.org'
Subject: RE: Cold-Formed Joist Lap Splice Question...One more time

YES!  And the design for this condition would support the analysis
diagram
below:

>       hinge       hinge
> -------o----------o----------
> ^            ^              ^
> Support    Support         Support
>
> William J. Keil, P.E.

```