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Believe it or not there are a lot of mono-slope roofs out there in which the girders and deck slope while the joists span perpendicular to the same. In fact there are many owners out there that believe that if there is a roof leak that the flutes of the roof decks act like gutters so-to-speak to allow the leak to drain to the rear/low point of the roof. Never mind that this assumes that the deck is installed in an appropriate and consistent ship lapped manner and that none of the side laps, connectors, welds or roof screw holes leak along the way.

Very few if any tilt-up panels have both footing and slab connectors, as designed and shown on the contract documents, even in seismic areas, however when the panels are erected the temporary stops/shims used by the erector during the construction phase are left in place thereby providing some horizontal force resistance at the footing to enable a force couple in conjunction with the slab dowel.



-----Original Message-----
From: Will H
To: seaint(--nospam--at)seaint.org
Sent: 6/25/2004 5:08 PM
Subject: RE: Home Depot

This may be an exception, but most Home Depot stores have the joists
running
from the front of the building to the back. The front of course being
the
highest point on the roof.

There are a lot of engineers who are not used to designing in seismic
zones
that do not attach tilt panels to footings, they only dowel into the
slab.
That panel may get blown over pretty easily.

I am surprised they don't have the area roped off, that one guy looks
like
he might wander over there beneath those free standing panels.





From: "Matthew Stuart" <pesepeng1(--nospam--at)hotmail.com> Reply-To: <seaint(--nospam--at)seaint.org> To: seaint(--nospam--at)seaint.org Subject: Home Depot Date: Fri, 25 Jun 2004 15:49:03 -0400

My 2 cents worth:



The bottom of the tilt-up panel was more than likely attached to the footing and at the slab up a few feet resulting in a resisting force
couple
that partially fixed the panel at it's base. Clearly the roof framing (which was more than likely roof joists spanning parallel to the non-loadbearing wall) was not tied into the panel very well. This is
not
surprising because I have been in a number of Home-Depot stores around
the
US where the diagonal joist bridging was not tied into the top of the
wall,
thereby not providing any redundancy where the roof diaphragm ties in
to
the wall.



D. Matthew Stuart, P.E., S.E.

MASCE/SEI/BPAD

Senior Project Manager

Schoor DePalma Engineers and Consultants

200 State Highway Nine

Manalapan, NJ 07726

732-577-9000 (Ext. 1283)

732-431-9428 (Fax)

908-309-8657 (Cell)

mstuart(--nospam--at)schoordepalma.com



-----Original Message----- From: Michel, Greg [mailto:gmichel(--nospam--at)DLRGROUP.com] Sent: Friday, June 25, 2004 2:55 PM To: seaint(--nospam--at)seaint.org Subject: RE: ITEM: "Store roof collapses amid heavy rainfall"
[Galveston,
TX Home Depot Store]



I also found it surprising, not so much from the standpoint that the
wall
is still standing after the roof collapse, but why the roof collapse
did
not seem to affect the wall.  It makes you wonder how well the roof
system
was connected to the wall.



Gregory D. Michel DLR Group 6225 N 24th St Suite 250 Phoenix, AZ 85016 602.381.8580 602.956.8358 (fax) gmichel(--nospam--at)dlrgroup.com

-----Original Message----- From: John C. Jones [mailto:john(--nospam--at)struct-engr.com] Sent: Friday, June 25, 2004 11:20 AM To: seaint(--nospam--at)seaint.org Subject: RE: ITEM: "Store roof collapses amid heavy rainfall"
[Galveston,
TX Home Depot Store]

It's amazing in that second pic that the tilt up is standing without
the
roof to brace it.



John C. Jones, PE Barnett Associates Pell City, AL 205-884-5334 205-884-0099 (fax)

-----Original Message----- From: Bill Polhemus [mailto:bill(--nospam--at)polhemus.cc] Sent: Friday, June 25, 2004 12:35 PM To: seaint(--nospam--at)seaint.org Subject: ITEM: "Store roof collapses amid heavy rainfall" [Galveston,
TX
Home Depot Store]

Store roof collapses amid heavy rainfall

Copyright 2004 Houston Chronicle



The roof of a Home Depot store in Galveston collapsed this morning, presumably because of heavy rainfall, and flooding on island streets
made
the morning commute difficult. No one was injured in the roof collapse.



Emergency Management Coordinator Elliot Jennings said of the accident
at
the Home Depot, "Fortunately, no one was injured. There was only a
minimal
crew in in the building."



The store, located in a new shopping center at 61st Street and
Broadway,
was not open for business when the collapse occured about 6:30 a.m.



Jennings said the cause of the roof collapse was not yet known.



==============END NEWS ITEM====================



PHOTOS:



http://images.chron.com/content/news/photos/04/06/25/front_depot.jpg



http://images.chron.com/content/news/photos/04/06/25/depot.jpg



Looks like ponding water, for sure. However, it's interesting that the collapse occurred at the front of the building. A similar roof collapse
I
was involved in many years ago, at a Wal-Mart store in the Tampa Bay
area,
was due to ponding at the BACK of the building, where the low point of
the
roof was (in that case, the contractor had put the through-parapet roof

scuppers one CMU course higher than the plans called for).



The Home Depot in Galveston is a tilt-up building with metal roof/roof joists.



We're at about three times the amount of rainfall about normal at this point in the calendar year in the Houston-Galveston area.

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