To: "'seaint(--nospam--at)seaint.org'" <seaint(--nospam--at)seaint.org>
Subject: RE: building on elevated ground
From: Harold Sprague <harold.sprague(--nospam--at)neenan.com>
Date: Mon, 17 May 1999 09:33:09 -0600
This is a question best answered by a geotechnical engineer. The
geotechnical engineering community is in a state of flux in this particular
area as I have responded in previous posts. I would guide you to the works
published by Soydemir, C.; Steedman, R.S.; Veletsos, A.; Whitman, R.V.
Chet Soydemer of Haley & Aldrich has just written a section addressing this
issue that will be included (subject to balloting) in the 2000 NEHRP.
One particular publication that you might want to consider is Analysis and
Design of Retaining Walls Against Earthquakes, ASCE Geotechnical Special
Publications No. 60, S. Prakash - Editor, ASCE, NY.
The Neenan Company
From: Alex C. Nacionales [mailto:alexcnac(--nospam--at)easycom.net]
Sent: Friday, May 14, 1999 3:37 PM
Subject: building on elevated ground
I designed a three storey RC school building
on site which is an elevated natural ground 5' above the road. The
retainwall is about
20' from the building line. My design uses a 9' wide continuous footing
located 5'6" below
natural ground. The old two story building has concrete columns which is
also the location
of my new columns. The old footings is 4'-6" x 4-6" wide and 16" thick. The
proposed to place the new footing 3' below natural ground which will be on
top of the old spread
footings and offered to deduct demolition and excavation costs from his
I will have to check the Beaing capacity at 3' level. My problem is how to
the effect of seismic load on the retaining wall due to new building because
the footing will be
2' above the road elevation. The overburden load will be neglibible.
I would appreciate any help or suggestions. Thanks in advance.
Alex Nacionales, C.E.