From: "C M IQBAL" <cmiqbal(--nospam--at)isb.paknet.com.pk>
Date: Thu, 3 May 2001 20:38:41 +0500
The support may only be considered fixed when permitted rotation is
completely restrained. But in case of bolted joints some rotation always do
occur which makes the base support to behave like a pinned joint.
Basically, in your case the column base supports are partially fixed.
Most of the computer programs do offer to model partial fixidity of
connections. Such as "Partial Moment Release" option stated after Member
Release Specification, stating upto what %age the joint may be considered
fixed. Such option is available in STAAD, I am sure other computer programs
do have a similar option too.
Anyhow, considering the safety of the structure, when in doubt, it is
safer to assume the joint to be pinned.
C. M. Iqbal
----- Original Message -----
From: Nacionales Alex <acnacionales(--nospam--at)yahoo.com>
Sent: Thursday, May 03, 2001 7:52 AM
Subject: Fixed or pinned support
> I am checking a structural computation for a four
> storey steel framed building. The framing in the
> calculation shows fixed supports but the detail in the
> plan shows the supports are steel baseplates with 4
> 25mm-anchor bolts. The columns are directly welded to
> the baseplates. It is my opinion that this kind of
> connection is a pinned type connection and should be
> treated as such in the calcs.
> Thank you for your comments.
> Alex C. Nacionales, C.E.
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