I was watching for this also, however as you know there are several options.
I know of one engineer that includes the seismic mass of everything, and the
soil. I generally will design for the seismic mass of the soil if
recommended by the agency or in the geotechnical report. I will always
design for the wind or seismic load on any projection or fence. As I
understand Caltrans is currently establishing some criteria, however the
existing criteria identified in the standard plans requires no seismic
design for retaining walls. Any sound wall or fence on a bridge or
retaining wall is designed for wind and seismic loads.
From: Mark Pemberton [mailto:Markp(--nospam--at)lbdg.com]
Sent: Tuesday, March 20, 2001 7:56 AM
Subject: FW: seismic at retaining wall
I got no response from this so I'm resending. I'm
sure others have been faced with this...
How would you analyze a retaining wall that extends
to form a 10 foot high masonry fence for seismic forces?
With a parking lot at the retained side, would the surcharge
load need to be included? What weight would you
use for the seismic mass? (Fence portion or the wall
in its entirety?) It seems there are several ways
to look at it and all yield somewhat different results.
Mark Pemberton, P.E..