Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Re: Filigree Wideslab

[Subject Prev][Subject Next][Thread Prev][Thread Next]

Well, now there might be TWO of us who won't sleep nights.

The underlying reason for my initial post was that I have been asked to
check the feasibility of strengthening an existing "2-1/4 Filigree Wideslab"
that has been "damaged" and is in need of repair. Naturally, the extent of
the damage must first be verified.

However, your comments lead me to believe I must be concerned about  the
original design and installation of the slab even without any subsequent

The slab spans 41 ft and is 8ft wide and 12 in deep. The objective is to
supplement the existing flexural reinforcement on the underside of the slab
with 72 ft-kips of additional moment capacity.


----- Original Message -----
From: "Sprague, Harold O." <SpragueHO(--nospam--at)>
To: <seaint(--nospam--at)>
Sent: Wednesday, November 15, 2000 6:23 PM
Subject: RE: Filigree Wideslab

> Jim,
> I had extensive dealings with Filigree and wake up in the middle of the
> night in terror.  Those dreams have become less frequent over the years.
> Now, after your post,  I am back to therapy.
> Seriously I saw that you already got the web site to Mid-States Filigree.
> They are the good guys.  They know the theory,  they have the practice,
> they know what they are doing right down to the details.  I did about 6 or
> buildings with the evil twin.
> The spin off that went to Chicago and then to Kansas City were the
> They never got the patent rights held by Mid States so that UL assemblies
> done with them are not enforceable.  There are several buildings in Kansas
> City, St. Louis, Philadelphia, Chicago, Topeka, etc. that were done with
> outlaw brand of Filigree.  The group had a couple of different names with
> Filigree included.  The outlaw was purchased and then dropped by a
> first in Chicago and then in Kansas City.  They had a tendency to not pay
> their bills.
> The basic method is sound (using precast and cast in place to form
> reinforced concrete), and in the hands of qualified engineers the finished
> structure was sound.  A few of the technical staff in outlaw Filigree were
> very good, but the sales pushers were way over their head.
> I could tell you horror stories.  But they are too gruesome for this list.
> If you are going to use Filigree, take the high road, go with Mid-States,
> and have pleasant dreams.
> Regards,
> Harold O. Sprague
> > -----Original Message-----
> > From: frp 2000 [SMTP:frp2000(--nospam--at)]
> > Sent: Wednesday, November 15, 2000 7:01 PM
> > To: seaint(--nospam--at)
> > Subject: Filigree Wideslab
> >
> > Does anyone on the List know of  references that cover the design and
> > analysis of "filigree" slabs??
> >
> > They are voided slabs that have been used in the past in the Chicago
> >
> > Any assistance is greatly appreciated.
> >
> > jim korff, pe
> >