You will get differential shaking depending on the strata of soil, orientation relative to the source fault, and the proximity to the source fault.
A couple of good sources for a starting point are:
Dr. Bob Herrmann
Saint Louis University
Dr. C.B. Crouse
URS Corp. Seattle, WA
Regards,
Harold Sprague
Subject: Reclaim Concrete Tunnel
Date: Thu, 15 Nov 2007 10:48:33 -0600
From: jmicayas@riverconsulting.com
To: seaint@seaint.org
Fellow Structural engineers:
I got this heavy industrial project I'm working on. If possible can I get a second or third opinion?
Project location: 70 miles away from the new Madrid fault (Missouri)
Project description: An underground reclaimed concrete tunnel with 6 openings on top use for loading and unloading coal materials
Discharge to a transfer tower using a diverter chute. A 50 ft high of coal stack pile sits on top of my concrete reclaim tunnel (width =20', Length = 450 ft., depth = 18 ft).
For seismic base shear using non building structure; In addition to the self weight and conveyor inside the tunnel, do you consider 100% of the material weight sits on top of the tunnel? If not, is there a percent reduction?
Thanks,
Engr. Julius Micayas
P.E. license no.32969
Senior Lead Structural Engineer
River Consulting- New Orleans
111 Veterans Memorial Boulevard
Metairie, LA 70005
Phone - 504-841-3014 (direct)
504 837-5275 (office)
Fax - 504-837-2986
E-mail: jmicayas@riverconsulting.com
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